ฝัง
- เผยแพร่เมื่อ 16 พ.ค. 2024
- Today we will discover a hidden feature to connect two or more ESP32s or ESP8266s directly to each other: ESP-now. It is much faster and more energy efficient. And we will compare it to LoRa (RFM95 and Arduino Pro Mini.
Espressif gave us this possibility and, because it is so fast, they called it ESPnow. And it also works in the Arduino IDE.
In this video, we will
- Try to understand the difference between the standard ESP mode and ESPnow
- Build a working ESPnow connection for two ESP8266
- Check-out the transmission speed and
- Compare this speed with the speed if we connect the ESP to the internet
- Compare the Energy hunger of both modes
- And finally, compare the ESPs with another technology: LoRa
Links:
Sketches: github.com/SensorsIot/ESP-Now...
ESP-Now example: github.com/HarringayMakerSpac...
Not-rebooting gateway: github.com/HarringayMakerSpac...
Online Battery life calculator: battery-life.of-things.de/batt...
ESP32 board: bit.ly/2sOMR3E
Supporting Material and Blog Page: www.sensorsiot.org
Github: www.github.com/sensorsiot
If you want to support the channel and buy from Banggood use this link to start your shopping: bit.ly/2jAQEf4 (no additional charges for you)
Official Wemos Store: s.click.aliexpress.com/e/jUzBiIq
profile.php?...
/ spiessa
www.instructables.com/member/...
Please do not try to Email me or invite me on LinkedIn. These communication channels are reserved for my main job
If you want to buy me a coffee: www.paypal.me/AndreasSpiess - วิทยาศาสตร์และเทคโนโลยี
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Watching your newest video became mandatory part of my sunday morning routine. Many thanks for this - again - useful and interesting episode!
Thank you for your feedback and welcome to the "Sunday Morning Club"!
#metoo :)
It's just not Sunday morning without Andreas and Great Scott! The videos are so well thought out and professional, I very much appreciate the time they put into them.
Your contribution for us is invaluable! Thanks!
Augusto Massaro True story Bro!
Double that!!
Thanks, guys. You make my Sunday!
Very interesting video. I didn't know about ESP-Now. Thanks!
I also learned just recently about it. And thought, it could be a nice addition
WOW! How come I only heard about ESP Now after all this time?! This is a major breakthrough in battery powered sensing!!
Good question. It is quite old stuff...
Lol. 😂 i just heard about it this week.
yeah, I too only heard about it recently... then again I'm clueless on electronics, I only recently started looking into them. ESP-NOW seems like a very simple peer to peer protocol, with emphasis on simplicity rather than interoperation everywhere like the TCP. There are good reasons TCP/IP is designed the way it is, but there're also good reasons to use something simple, fast, low-latency and nonstandard on certain applications. First time I hear of Lora as well, I suppose there's applications for this too. I suppose electronics people can easily build a dead simple transmitter/receiver and if they can also code, they can write their own simple protocols if they have specific needs. ESP-NOW seems like a good start for us newbies to play with and make stuff do stuff quickly.
@@cliffchism9187 bro... I heard this week
Thank you once again. Very interesting and gets me thinking of all the possibilities. I really appreciate the time and effort you put into your videos. Thank you.
Richard Wilson Very true
Thank you! You like to watch the videos and I like to read all these nice comments during the whole Sunday! This is what we call win-win...
Thank you Andreas for your sharing your work to the community! It's exciting to think of the applications that can be made possible through the amazing ESP8266 chip as well as LoRa.
You are welcome!
I finally ordered a couple Esp32's after years of holding out. Your videos are bringing me up to speed on them and their features and quirks as quick as humanly possible.
Thanks for saving me so much time!
You are welcome! And enjoy these wonderful chips.
Really like your videos Andreas! I am a novice learning and find that they have improved my learning better than any others. Thank you!
Nice to read. Thank you for your feedback!
Another great and informative video! Congrats Andreas on the very soon arrival of 50k subscriber's.
Maybe as a Christmas gift!
Thanks again Andreas, you are definitely the best companion for any project
Thank you!
The months december and january are designated for home automation and electronics, these were well timed videos. Thanks for pointing us to node-red and to this possibility!
You are welcome!
Very interesting video and the ESP-Now concept (which I hadn't heard of) will be invaluable for my battery driven ESP8266/ESP32 devices.You could say it will transform it! Many thanks to taking the time to make this video and Seasons Greetings from the UK to you and your family
Thank you and also Merry Christmas!
Andreas, you really are a treasure. Thank you for all the effort you put into each of these videos.
You are welcome!
This is exactly what I wanted. I'll be implementing this on some marine monitors! Thanks for this vid.
You are welcome!
@Andreas Spiess thanks for all your videos & effort
My pleasure!
Using the examples, and following your instructions, I linked two ESP32 Dev boards together and communicated successfully via ESPNOW. You are one of the best teachers on the internet. Glad I subscribed long ago. Now I have to actually send some data packets of my data. Swiss accents are very nice.
Thank you and I am glad it worked for you!
Excellent video, as always. Like most I wasn't aware of ESP-Now.
Thank you!
hi , an great video as always ! thx
You are welcome!
I’m now asking myself why I have not watched all your videos. I’m grateful that you have taken so much effort into micro controller technology. I will now research about ESP32 now.
Enjoy the ESP32. It has very good features.
Wow! Mr. Spiess this is news! That looks really interesting. Thank you for this video, going to investigate more, looks promising!I can imagine the applications like mesh sensors for farmers, for preventing fires and so on...
Thanks for your feedback!
Ein aufwändig gemachtes Video, das einen tollen Überblick gibt ! Vielen Dank dafür ☺️
Gern geschehen!
Thank you very much for pointing me in the direction of ESP-now. This is the step I needed to make battery sensors based on esp32/esp8266. I did wrote a esp-now to mqtt gateway on one esp8266 without problems... First init WiFi and then init espnow. I have them both active without any problems. BTW, I like your video's very much. Keep them comming.
Thanks for the feedback. Could you probably post your code somewhere for others to be used? Seems interesting.
I have tried it. It works for some time, with a round trip time measured on the sensor ( master ) node that is twice as large ( 17 vs. 4 ms). The sensor node does never receive an ack in the send callback function
an error (1) is returned. Then, after about 8 messages, the WiFi node does not receive any moremessages.
Of course, I may be doing something wrong. See github.com/gitpeut/try-espnow.
To get this working I'll go for DualESP.
Congratulations, excellent video.
Great Video! I have been toying with having several sensors around the house but up to now I haven't seen a good way to handle it. I didn't want to get into LoRa, moe unique boards and new things to learn. I also am moving everything over to the ESP32 so this all fits for me. Thanks again.
You are welcome!
Great video and very useful. Will solve a problem Ia'm having with a solar powered ESP32 project running out of power at this time of year. Was going to rebuild form scratch but using ESP-Now should hopefully solve the problem. Many thanks, keep up the good work.
Maybe it helps at least...
Very nice job Andreas as usual!
Thank you!
Thanks for this video, very insightful
Glad you enjoyed it!
This is most excellent. I'm working on putting together a home automation system using ESP8266's for various sensors and switch supervision. One of the issues I was running into was how to toggle several different lamps on and off. I really don't want to be tied to a smartphone, PC, or some sort of master control panel to toggle the reading lamp in my den on and off. One idea was battery powered "remote" but constant connection to wifi would kill the batteries in no time.
With your ESPNow solution, I could setup an 8266 as a master/gateway to wifi and have several battery powered push buttons throughout the house.
You might also watch my videos (#101 and #108) on the dash buttons.
Thanks, very well explained!
You are welcome!
Really helpful, thank you.
You are welcome!
Another great video Andreas, thanks!
You are welcome.
Yes, Interesting. I find the RMS function of the oscilloscope useful for measurement of power in complex waveform events.
Good idea. So far, I never used it for such signals. Are you sure it will work with these small spikes?
Incredible =D thanks for this really really cool videos
Thanks!
thank you very much Mr Andreas
You are welcome!
It is becoming a habit for me to like your videos and then watch them.
Thank you for your support!
I'm not sold. The advantage of LoRa is it can transmit over very large distances, as famously proven by yourself in your incredible video where you transmit from France! ESP now, being based on WiFi radio will not have anything like the range. These are apples and oranges. It might be good, say, around the house for sensors; but for SCADA and telemetry (where I'm developing LoRa products) this isn't appropriate. It is very interesting though. These little devices are simply incredible! Thanks for the video Andreas. Warmest regards from Aberdeen, Scotland.
I think, your comment is a summary of my video. My last sentence was:
"So, each of the three technologies has its perfect fit, but also areas where I would not use
it. Maybe this video helped you a little to do the right decisions in your
projects."
BTW: You are a great musician, too. I saw Mark Knopfler with Bob Dylan in Zurich. This was one of the best concerts ever. Because of Mark!
It would be interesting to do a test to check the range of the esp in this mode.
Andreas Spiess Ha ha! Thank you!
Could I have the video link of this LoRa test? thank you
Another great vlog Andreas.
Thank you!
I had heard but forgotten about this, thanks again Andreas! I went directly to Ali Ex to buy memory for my box of ESP01dev boards. This should enable OTA, free some GPIO and make for some super low power 'things' about the house. I see a commercial app too, many thanks again!
If you do not need lots of pins, the ESP-01 is still interesting...
Very good again - lots of interesting information and relevant observation
Glad you enjoyed it
@@AndreasSpiess
If you have time I would like to hear ideas about measuring liquid pressure like the bear pressure - simple and reliable - I need to estimate water level in a elevated storage tank and pressure seem to be a simple way but could not find a simple transducer .
Any way , thank you for time .
They sell pressure sensors on AliExpress. But I do not know if they fit your requirements. I searched with "Water Air Pressure Sensor"
@@AndreasSpiess
Using your hint I found one at Amazon that might work . Thank you
Interesting! thanks for posting!
You are welcome!
Thanks for again a great and inspiring video.
As I read in the previous comments, it would be great to see an example were an ESP sends data to an ESP with a serial connection to a raspberry running node red.
Maybe I will do something like that, but I am not sure. Maybe somebody else will do it?
@@AndreasSpiess I did it myself, see www.instructables.com/id/ESP-NOW-Home-Automation-Esp8266-Raspberry-Pi-MQTT
Great video! Thank you.
You are welcome!
Andreass, you are my hero. I look forward to each of your episodes. Your style is flawless.
Can you do some more on the" ESP Now" but with detailed range testing. This is of great interest to me. Will the range be the same for both the ESP8266 and teh ESP32?
I plan a video concerning ranges in the near future.
Excellent, as always
Thanks!
Sehr gut gemachtes Video. Ich habe mir direkt einen Außentemperatur Sensor mit dem ESP-07 (mit Antenne) und einer Empfangsstation mit dem ESP12e mit Adafruit Display nachgebaut. Das ganze mit den Programmen von HarringayMakerspace. Funktioniert tadellos. Immer wieder erstaunlich was man mit den ESP8266 Modulen anfangen kann. Weiter so !
Deswegen haben diese Chips so viele Anhänger...
Awesome video! Here's a project idea: many esp8266 devices connected via esp-now to a esp8266 master that has a serial connection to a raspberry pi. All messages from the esp-now nodes go through this serial connection to node red for automation tasks. That would mean you could skip mqtt completely if you only need esp-now nodes. Could be a unique network style.
This is definitely a better idea than the one I used if you have many sensors. I found a plan to add another ESP for MQTT. But your proposal is simpler. And if you use a Pi zero, also not too expensive.
I was thinking, there's one disadvantage with ESP-Now: you're relying on an ESP module to do all the receiving of signals. They usually have PCB antennas, except for the ESP-07, so range will probably not be as good as with a router. And with routers you can also have multiple routers serving the same WiFi network for really big spaces. Could be problematic when trying to cover a big house or yard with sensors.
Would be nice if there was an ESP8266 or ESP32 based board that is focused on getting the best range, with a properly tuned external antenna and everything. Or if there was a way to have traditional hardware listen for ESP-Now messages (it should be doable, but I doubt there is software for it).
Thanks, great video, very profesional!
Glad you liked it!
Very very useful thanks, terrific video
You are welcome!
Thanks, very informative! By the way, in case of "standard" ESP mode calculation you used 90mA, but in ESP Now - only 80mA. Was it intentional or just a mistyping?
I added a little for the many small spikes. For sure not accurate, but I am an engineer, not an accountant ;-)
Thanks for all great videos! I experimented with the ESP8266 and ESPNow and WiFi and found that the WiFi channel selectivity of these is extremly limited. When signals are strong, the STA will easily connect to an AP on a neighboring channel and ESPNow transmissions sometimes get ack-ed on channels that are even further away. When a unit receives an ESP message that does not mean that the transmitter sent that on the same WiFi channel.
That makes it hard to make an automatic channel selection by scanning for response (that and the issue that channel is not easy to control in STA mode). Obviously it gets better with more distance but the crosstalk easily reaches 10 meters or more. It also means that distance performance and your measurements probably get influenced by nearby transmissions. A strong signal from a nearbby transmitter even when on a different channel may have a large impact.
What you did is a real life situation so it is a good indication of what can be expected, but it makes it probably not really reproducible, it is more an indication of what is to be expected.
I wish RSSI was avaialble for ESPNow receptions and ack, that would help a lot. Now I get responses on multiple channels and have resorted to picking the center one where there is response. I haven't tried with a ESP32.
I was not aware that crosstalk can be demodulated. That is very strange behavior! Thanks for the info
Dear Andreas, as always your contribution is valued and highly valuable. In this case however I must comment on the continued usage of historical and outmoded references to "master" and "slave" as originating from a supremacist vocabulary. Recent similar discussions have remarked upon alternative functional terms (dependant upon context) as:
"control vs remote vs return" &
"origin vs target vs response" with:
a common term of "message" referring to the data from the control or originating device &
data sent back to the origin or control device being referred to as the "return or response"
This not an exclusive list but is a starting point for memorable replacements with CRR & OTR mnemonics for non exclusive examples of "Comfort Requires Relaxation" and "Open Truths Refresh"
Good Job Andreas!
Fortunately, we Swiss have no such history and our thinking is "clean". So I have no issue using these commonly accepted (in electronics) words.
en.m.wikipedia.org/wiki/Triangular_trade. I agree your national history and identity stand as exemplary and are iconic representations of neutrality. I do not think you would be drawn into any discussion to logically prove your outlook. However even Switzerland stands upon the shoulders of vast economic inputs from 400 years of lucrative triangular trade by Western European countries including the UK who are trying to avoid responsibility for the fallout from arms trading to the Middle East by exiting the European Union. Our histories are all based upon supremacist exploitation of an isolated peaceful continent and it's populations. Please reconsider your use of historically tainted and conceptually overloaded terms. Although you may say they are in use within an industry characterised by white males, the need to recognise seed concepts as a danger in the naive mind that has not yet grasped the functional concept of balance to establish self organizing neutrality. Such personalities are readily targeted by unbalanced supremacist personalities for their own gain. The symbols of national socialism circa 1930 Germany have been outlawed for similar good reason. Please show respect for the millions of personal tragedies created by the paired concepts of "slave" and "master". Non but ourselves can free our minds, but we can help each other. Thank you, Andreas
Crazy! I just calculated a 3 year lifetime when running on a 2600mAh 18650, sending data every hour. Work just got really fun.
:-)
3:29 you meant http right?
Also gr8 video btw. This was exactly what i needed for my current project :-)
I meant HTML but forgot HTTP.
Thanks so much for another one of your wonderful videos! Btw, the SF7 most *definitely* must have higher range than the ESP8266's WiFi, right? I mean, WiFi can only go so far. Maybe 50, 100mts? SF7 I'm sure can go for kilometres, isn't that right?
+Tejas Arlimatti You are most probably right. But I will try it in another video.
I would like to see a follow up video on rage :)
Great video
I hope I will find the time in the next future...
As always a great topic, that i didnt even know existed. All the news here on this channel! i think the big fight for this wonderful chip is now battery consumption ( a part from security, because my test show that more often than not, ESP32 crashes and locks at least once in a week, as weel as QoS). One sample per hour is not really my standard. Maybe a video putting all of our choices and the pros/cons comparison. BLE, LoRa, ESP now, Wifi (and other we dont yet know about?). Battery consumption (incl wake from sleep), range, bit rate, and QoS. Great work as always Andreas!
A lot of wishes... Maybe one day they become true ;-)
yes and a lot of work, i know. but you have made most of the tests now. i was thinking the Big Recap of those. so maybe less work. anyway, whatever you do, i will follow! thx
Thanks for sharing
You are welcome!
Jus Came To watch detail about esp-now but now im enlightened...
:-)
@@AndreasSpiess Didn't thought it would be freaking detailed thank you very much for the hard work...
Love your video's - spot on! Quick Question on video #172: Can ESP-Now still communicate in "Station+AP" mode? Or is it one or the other.
I understand it can be both.
Hi Andreas, very informative video, thank you
Whilst there are plenty of examples of its use, I've spent a lot of time trying to find the
ESP8266 library itself, it seems Github has many variations and function constructs
and defines are different between different versions, with different people adding various
arduino library wrappers.
I've done quite a few 'Alexa' projects so I'm happy working with the esp8266 via WiFi, I use
only the tiny ESP-01 boards, using the ESP extensions in the Arduino IDE and programmed via
async serial. All work well. But I've been unable to compile anything at all for espnow!
As yet I've not found anyone successfully using espnow on the ESP-01. If I could just get the
simplest espnow example to compile I would be happy!
Keep up the good work, the Lora videos were particularly helpful.
Cheers :-)
Phil
Maybe the flash memory is too small?
very useful and great content.
Thank you!
Thank you!!
You are welcome!
Very nice video! Do you have an educated guess how the range would be of ESP-Now relative to WiFi range?
I assume it will be similar, but I plan a video to check.
Andreas Spiess I am looking forward to see it!!! Thanks.
Fantastic video
Thank you!
very much informative......
Glad you think so!
Great video, very informative.
What alterations are need to your Slave code in order to receive data from multiple Master units?
I do not know. Maybe Google knows more?
Thanks for replying, I found the answer shortly after my initial post. 👍🏻
Andreas,
Thanks for the informative videos about IOT gizmos. You mention the limit of 20 devices per node. If we add another Master kind of unit can we get another 20 devices? What about 3 or more Master devices? Not sure where the limitations come from.
Also: You sound very much like a friend from Bern. You too?
AFAIK the limit is per device. If you add more devices, you can multiply this number.
I think, most Swiss German speaking people have similar English accents...
Ver nice and clean explanation about ESP-Now; quick question can we read message stream with mobile phone in wilderness?
I do not think so. For wilderness project you might watch my meshtastic video
@@AndreasSpiess Thanks a lot, that is exactly I was looking; you are always fantastic.
Very very cool. Something worth trying might be to measure signal strength and create a mesh with multiple devices
Like this? github.com/gmag11/painlessMesh
Oh wow!. thats pretty cool. But I don't think it uses ESP now
It does not, it forms a network with devices set to the same AP, even though the AP does not have to exist, just AP name and password must be the same.
defiantly one to play around with
It seems, that Espressif also offers a mesh ( espressif.com/en/products/software/esp-mesh/overview )
hello Andreas, many compliments, your videos are always very interesting !!! I wanted to use this ESPNOW technology for an outdoor application. But when I tested the sketches, I noticed that ESP32 heat a lot and this seems to me a big problem especially for the reason that some nodes would go in the box exposed to the sun and I can not install a fan ... I think that LoRa does not have this problem, what do you think?
LoRa transmitters use less power and heat up less. But the sun might be your real problem.
Hi Andreas,
first: Thanks a lot for your detailed and interesting videos. Because the ESP32 also include Bluetooth, what is your opinion about a Bluetooth Mesh for Sensors? Especally in battery consumption.
Thx, in advance
Olli
I am no fan of mesh in general. If it would be useful, It would be used much more. In my opinion it is ok for a fe niches. BT only has a small reach.
great video!! I am trying to do a point to point using esp32/esp8266 to send a temperature from a max6675 to another esp32/esp8266 to output to my nextion display or a tablet. Thanks for all your great videos
You are welcome and good luck! If you have a sketch with mixed ESP8266 and ESP32 it would be nice if you share it. I did not find one.
Ok if i write one i will i hadnt decided if i'll use the esp8266 or esp32 or one of each I but I'll post a link to my git hub page as soon either fine wine or right one
Andreas, thank you for leading me to Anthony Elder's code resulting in a 220 mS communication period and power savings. After your video was published he has offered an even lower-power alternative in espnow-sensor-minimal.ino that describes a 40 mS period. This uses a sleep function called "ESP.deepSleepInstant". After verifying that the receiver/sender pair worked with ESP.deepsleep() I had some trouble using deepSleepInstant. It seemed to be too fast in closing down - perhaps shutting down the radio before it was done. Later I found that my last Serial.print functions were missing. Inserting a delay(10) right before deepSleepInstant seemed to fix it. BUT THE BIG NEWS is that the measured time between "send" and the end of the callback function is averaging 100 mS. Not as fast as the advertised 40 mS, but still a big savings for the battery! Very un-powerful! Hope this helps your viewers.
Thanks for the info. Serial print takes some time. And if you place a sleep command after such a statement the info is no more sent out.
@@AndreasSpiess Yes, Serial.print takes time. And the same is true for other communication logic, I presume. I was thinking that the processor was thinking... do A, stop, then do B, stop, then do C. My error was thinking these ESP devices are 'single threaded' or not 'multi-tasking', however they are really multi-threaded and multi-tasking, because B can start before A has finished, I think I am experiencing. (Fortran N77 was my last class on the subject, long ago.) If the device is shut down before a transmission is completed (serial, or radio) then the transmission that was underway is not completed, right? For me that is a design discovery and an 'abstraction' convenience as it makes it easier for rookies like me.
BTW: "cavalier 39" seems to be my default username when I have that gmail account open. My true identity is Craig Larson, a loyal patreon'ista. (I advise all Andreas fans to join Patreon and support the channel! Do your part!)
Great material. He helped me a lot to understand the problem you raised in this episode. I'm currently doing a similar project in college. would you help me and recommend some internet sources or a book in which this topic is extended? I also want to encrypt my connection and get the maximum point-to-point speed possible.
You have to do the research yourself because I am not interested in security and therefore have no knowledge. Books are usually outdated before they are printed ;-)
I f-ing love your videos
Thank you!
Cool! I used ESP-NOW in my ESP32 clock!
Now I watched your cool clock video!
An other great video, as usual ! Did you check the impact of using encrypted transmission for the ESP-NOW ? LoRa is always encrypted. I wouldn't want to send clear text messages in a non-rural area.
No, I did not test it. I am not transferring any secret messages across such lines, so I had no need. I think, you just enter a key and then it encrypts (somehow)...
Great videos!
How about range? I need to get 200 - 300ft of point to point range. What is the best way to go?
If it is line of sight with no obstacles, WiFi might work. Otherwise LoRa is better. I would first try WiFi.
Hi Andreas! I'm trying to build a battery operated heart rate monitor using the ESP. First I was thinking in using it alone, but it uses too much power. I'll try to use ESP-Now.
Before connecting and sending data, do you remember the consumption of the ESP?
I need to power the sensor for at least 10s so the reading stabilizes and then, send the data to the other ESP witch will send to the internet. During this period (almost executing a blink test), what should be the power consumption?
The ESP32 is not known for its small power consumption. You should find the power consumption of all modes in the datasheet. WiFi and BLE use the same amount of peak power because they use the same radio. However, ESP-Now uses less time for transmitting than standard WiFi.
Maybe you can use the ULP for the measurement and only switch the MCU on for transmission.
Cools...
You are very awesome,Andreass !!!
Why you can understand many things and create videos that are very useful just in a week? Are you doing research every day in your life? I'm courious...
Yes, of course I work nearly every day and sometimes also the nights on my hobby. This keeps me young...
hey Andrew,
Could you do a comphrensive comparison on WiFi, LoRa, Bluetooth, BLE, Zigbee, RF, GPRS etc.
Maybe you watch my LoRa introduction video?
A very good video, thank you so much! I have a question. There are modules with an ESP32 and OLED and Antenna with LORA-Chip. For that modules, is it possible to use that antenna also for esp.now? Or only for LORA? Thanks
Lora is a different radio on a different frequency. The antenna is only fo this radio. Maybe you watch my video concerning these boards.
I did, and still I am watching... But I can't find out if there is a module which Esp.Now is working with a external antenna (and not with the chip antenna)...?
The ESP-07 module has aWiFi antenna connector
Yes that's right - but the ESP-07 is only an esp8266. I am looking for an ESP32 with antenna for EspNow
Awesome!
Thanks!
Hi, great videos !!! For a 1-2km range which one would you use ? I have a small farm and would like to open and close water valves for the irrigation system. Thanks, Max
You can watch my videos on LoRa range. Wi-Fi is not made for big distances
I have just discovered ESP-Now thanks to your video, so thank you! Although I do wonder if it's possible to use an analog input on master (a potentiometer in this case) to control a micro-servo on the slave. I have tried searching about this but to no real results.
This should be no problem. Maybe you divide the problem in parts?
@@AndreasSpiess thank you for the reply! Yes, I was thinking about reading the potentiometer value on master, converting into an absolute number between 1-255 and send to slave serial through esp-now. On slave, read the serial and use a "if" or "for" function to act on the serial value. I have yet to try this method but I do appreciate if you have any other method of going around this case or opinion about the validity of this :)
Awesome. I have been thinking about how to send data between some of my sensors on esp's.
I am just hoping one day that WPA2-enterprise will start to work on the eps's.
I am not a network specialist so I do not know the advantages of such an "enterprise" infrastructure (at least for a maker like me)
It's what they use on university's so that's why i am interested. I work at an university, and i would be able to "roam" with my login an all of campus.
Aha. That's what I thought.
Hello, Andreas.
Will you make more videos about espnow?
I do not think so. What is not covered?
One thing to consider is the significant difference in price between the ESP and the LoRa. Given the price difference I would pick the ESP every time especially since you need two for connections
:-)
Hi Andrea, did you try to check esp-now transmission range? Espressif says that it is better than wifi (around 400m). It's far less than LoRa! Esp-now seems to be a very good way to transmit data for LAN range but is not adapted for MAN or WAN use cases. Thanks for all your great videos. David from New-Caledonia (south pacific).
I am not sure if I tried it once. But I have some ideas and probably will cover ESP-now in the near future.
man, you're a godsend
:-)
Hmm I way typing a message and somehow did a shortcut and lost it, going back to an earlier video I was watching, well earlier. My question is, does this ESP-now work with all esp8266's or just the model 12 and above? I have quite a collection of these devices, and I can really see some advantages using this form of communications, especially in our RV which we spend our winters in, hiding in Arizona, while the frigid winters of the Dakota's make old folks like us regret ever settaling up there. The Mojave Desert is a wonderful place to spend the winter, it's 72 degrees here now, while back home they are enjoying indian summer today with the temps over 50 degrees however at night the Dakota's fall to zero F or lower, while here in the desert, it can get darn right cool at 55 degrees or so. Anyhow thanks, we seem to share an intrest in many of the same devices, so I look forward to your posts, knowing I will learn something new every week, and I have this strange belief that if you learn somthing new every day, you can fight off old age.. Works for me, most folks have no idea that I am 66, most put me at about 40 and if I take off my beard, even younger....
Sounds like a nice life! Here we prepare also for winter which can also go way below 0 (Celsius, of course). I traveled once from LA to New Orleans in 8 days, all backroads and still remember that it was a nice experience. Phoenix, Albuquerque, Los Alamos, Memphis, Clarksdale...
Yes, ESP-Now should work on all ESPs. It is just a library.
Hi Andreas, thanks for the vid. Any idea what the maximum theoretical speed of ESP-NOW is?
For context: I'd like to stream video from one ESP-32 with a Camera to another which has an LCD display. I've figured that ESP-NOW is probably the best protocol to its lack of overhead.
It is always best testing it out because it depends on different factors. It should not be too complicated.
Just a quick note as I have not seen much written on the ESP-Now topic. I have tested distance/range of 2 different types of ESP32 boards, DOIT Devkit V1 and a TTGO T7_V1.0. I used the scripts by "Harringay..." as listed above. No matter what combination of boards the greatest distance I could get between master and slave was approx.15m. My wifi distances were similar. Anyone else carry out measurements with different boards ? Ta.
Vielen Dank aus T/ucson Az. USA
Gern geschehen!
Thank you. What do you think abouth using esp-now to Control RC car? I think that problem will be with estabilishing new connections on every change of potentiometer. Did you do some testing on this? Or maybe esp-now sends only advertisment and its performance will be good. Esp-now is so Simple that i will check this for myself as soon as i can.
I can imagine that it would work.
Awesome...
Just one question though...
for esp-now... is it possible to have a deep slept esp32 and wake it up with espnow?
What I want to achieve is, a tag that can have a small battery+buzzer+esp, can be attached to my car keys,
so i can locate it with another esp :)
it would be nice if the tag was in power saving mode in the interest of battery
Keep in mind: Deep sleep means also that the chip does not receive. I am not sure if this is what you want...
If you compare them, then you should use static IP, as you use static (MAC) address in the ESP-now.
The data size for IP addresses are not a problem with the high transfer speed.
ESP and LORA have much longer range. (ESP as it uses Internet, but have to have a router near).
1. Static MAC is not the same as static IP for me. My router does not like too many static IP addresses, so my limit is there.
2. I plan to do a comparison about the ranges
Static address are the same, what ever format they are in. As MAC address are the only address level for ESP-now, that is static addresses. IP dosen't actually care about MAC address, as that could be changed for the same MAC: That is different abstraction levels. With static IP, you don't need the negotiation time.
Yes, that is a problem with small home routers.
Good one
Thank you!
hi Andreas, im just starting with LoRa and i have a couple of Ra-02 modules working on 433mhz. Im planning to build a p2p coms between them my question is besides the frequency and max output power do i have to take in consideration things like duty cycle, bandwidth, payload size, etc like we do in LoRaWAN(i live in Europe dont know if its is important)?
Thx for the great videos!
Maybe you watch my LoRa introduction video (and other videos about the topic) to understand the difference between LoRa and LoRaWAN?
I am very interested in learning how much effect the distance between modules has on transmission time. If I had for example, several of these set up as a network around a farm and I was to systematically ping them from a moving device, could I measure distance variations due to transmission speed and thereby calculate location. Kind of like a private GPS system...
+Bill Field Waves travel with speed of light. I do not know the sitze of your farm, but assume the time needed to travel the distance is very short. Waves need 1.3 seconds from the moon to earth.
If I remember right, cnlohr tried this approach, but without big success.