ฝัง
- เผยแพร่เมื่อ 6 ก.พ. 2016
- I had a great time getting my ESP8266 to broadcast analog television! I went ahead and listened to a lot of comments, and got color working along with a much more expository explanation.
If you're seeing this in 2020 and want to know how to do it yourself, check this out: • Installing the esp82xx...
As always, here's the github. github.com/cnlohr/channel3
P.S. The cnping network monitor is available here: github.com/cnlohr/cnping
I now have a patreon, I am still trying to figure out how all this works! / cnlohr
The SDR software I used was from osmocom. The page and compatible dongles can be found here: sdr.osmocom.org/trac/wiki/rtl-sdr - วิทยาศาสตร์และเทคโนโลยี
![โอ้มายก๊อด! ไม่ถึงชั่วโมงหมดเป็นแสน 😅 [cc] แดนแพทตี้ SS2 | EP.42 |](http://i.ytimg.com/vi/OH2ShXfO6tA/mqdefault.jpg)
That is amazing! I am always crying when I see people using there ESPs for something like LED-blinking; your projects really shows the power and value we have hidden in the ESP8266!
It's WAY more powerful than MQTT
You deserve more subscribers.
+Stephan I'm getting there. I'm super glad I've got you guys, though!
+Stephan and free cake!
There will be no cake till it's PAL :D
"Never The Same Color" joke is just as awesome as the rest of the project
That end shows the true meaning of NTSC XD
Radiowave based living organism detection?
@@vortex8384 Never The Same Colour
I thought generating video was impressive. Now in color too?!
For your next magic trick I won't be impressed unless the ESP generates 3D 4K video! lol
Seriously though... Very impressive! Maybe someday I might understand what you're talking about. :-)
This is soooo COOOOLLL! You definitely deserve more subscribers and more recent viewers.
You will go far, keep doing wonderful things :)
your tv blushes when you get close to it :)
Amazing as always! Love watching these
Holy shit. I've been doing electronics for nearly 40 years and you've just blown my mind. Respect!
Indeed this deserves 1 million subscribers... Totally awesome stuff here!
i liked how you explained how to get that 30MHz signal. good stuff. cheers. those ESP chips are quite fun.
+Brutaltronics Are you talking about the thing where I show the time domain thing toward the end? If so, that segment was recorded today. I didn't even plan to include it in the release. Just threw it in last minute.
This is the best use of an 8266 by far...
Dude, this is awesome! You just turned an old tube TV in to a Smart TV with touch screen.
Dude!!! Just... dude... ! Outstanding work
In the future... "If I (ever) see farther than others, it is only because I have stood on the shoulder's of giants" (~Newton). Seriously, your brain is working on a whole other level. Like I arrived to a Quantum Physics class mid-term :) Thank you for the aMAziNg mental gymnastics. Cheers!
Those last few seconds of the video were classic. It's like you were playing a video Theremin! Great video. Can you estimate the wattage output of the signal? Also, were you connecting to the device over WiFi or over a wired connection?
+Casten Riepling Across the entire transmit space, I don't believe it's possible to be more than 0.1W, so within that band, it must be much, much less.
Yeah. There's a huge community around the RTL-SDR. They've got everything from really tiny dongles to a box of 4 you can use for passive radar. They're stupid cheap, compared to legitimate dedicated SDRs which would cost upwards of even $3K.
with the rtl chip rx and esp producing baseband this could mean a full ham radio with data modes and oled in the old altoids tin
Amazing project, thanks for sharing
that is soo cool that the coolness of it can not be measured!
Thanks!
Hi, I find your video well made, and educational. Thanks for taking the time to share with all of us. Question/Request. Could you discuss more about the USB SDR, practical uses and associated software in more details?
+Mike Poirier Sadly, I don't know very much about it, myself. It is more a curiosity to me, instead of anything useful.
Amazing work !
Your the man, super in depth video. Thanks for the brain food.
THAT END AHAHHAHAHAHAHHAHAHAHAHA
no words but only..... Sheer Excellent :)
14:04 you are a wizard CNLohr
You sir, are a genius.
Great job, just viewed your new channel trailer, and I hope that means more videos soon :) just wondering, are you still using the same toolchain for ESP8266 as presented in your video from about a year ago (updated though, I can see that last update on GitHub is from February 2015) ? Would you still recommend it, if someone would like to start just now?
+Filip Skoneczny I would absolutely recommend the compiler from the esp open sdk and the official ESP IOT SDK for the runtime.
What're the other web technologies in the coolest top 3? I assume websockets is one of them, have you talked about the other?
+Rob Mckennie
#1: WebGL
#2: WebSockets
#3: WebWorkers
Dude, you're genius!
that's really, really cool!
Hehe, if you like the I2S module now... it's going to have some nice improvements in the final ESP32 version. Would be interesting to see what you can do with that.
+Sprite_tm I really wish I had /all/ the documentation on the '66. If it weren't for you, I would never have found the DMA on the I2S (and I'm very grateful). I can't imagine what other secrets the '66 hardware holds. That said - I am very interested to see what this hardware can do. All that said, I do look forward to finding out how far you can push it's hardware and see what can be done!
+Sprite_tm Charles will probably modulate DVB-T with it ;)
Is there a second I2S port? And if there is, could you make a resistor ladder DAC to send a bit of a smoother signal? Would that help reduce the noisiness? Or would it actually be worse since you're relying on sidebands or whatever the word is, the reflections on the spectrum, so meaning the signal's impurity is actually doing a lot of the work?
Of course a third and fourth I2S stream would let you use even more bits in your DAC.
+greenaum There is not on the ESP8266, but there will probably be on the ESP32!
wow, great work
Ok mind blown again... Only 11 hours into 2017. You've implemented various technologies (websockets, JS etc) that make me very excited about the 8266's IOT future... Wow.
yeaaaaaaaa
Sorry if I said something that offended you., or something wrong in a different sense,
Oh, it was more of a yeaaaa like a rockstar would sing on stage! haha I can see where there as confusion.
8-] fair enough... rockstars should be cut some slack
Got a link for that spectrum analyzer? I'd love to pick one up!
+Matt „Sigurthr“ Giordano Go to sdr.osmocom.org/trac/wiki/rtl-sdr -> Supported Hardware
Magnetic999 thanks!!
+Magnetic999 Added to description.
As you can see in the Arduino IDE options setting the ESP8266 can run at a pace of 160mhz. Don you think that using that 2x faster option could help rmove the "noise" in your picturing?
For Channel3, I am operating in 160 MHz. But, some of my nosdk8266 stuff at 320 MHz could.
Is a flicker free AV output capable with this for direct connection to the TV instead of broadcast?
+Jeff Ledger You could probably get much better fidelity, but I haven't tried.
you're a gd genius!
You're a wizard
Is there a way to utilize the "channel3" library to output any frequency of choice between 3 to 4MHz or even 3 to 14MHz?
Btw. Amazing job, blown away by it! :)
You can synthesize any bitstream you want, so yes, it is possible to transmit frequencies below 40MHz as well.
do you have a picture of how you wired up the i2s bus ? it needs 3 gpio pins ?
Wow, Thanks for sharing :-)
You have too much spare time. Get a job :D
Amazing stuff, love it!
Can this used with modification to output high resolution composite video instead of RF? Maybe S-Video on two pins with better colors? :) One more. Is the spectrum displayed in the web browser coming realtime from the ESP as well over websocket? :o
The web browser says "simulation" so I think that's just a calculated spectrum, calculated on the PC, that should reflect the actual spectrum coming from the ESP.
The stuff from his SDR dongle is the real thing.
I think!
+greenaum Indeed that is the case!
What I'm impressed with is the web interface that parses a text with setting.
That was a lot of fun, and I intend to do stuff like that in the future.
That's a great direction as it must speeds up MCU development a great deal. Will you make a video about it?
I haven't really used it before or since. I've always wanted to cross-compile TinyCC to Javascript for this sort of thing but it hasn't really worked out :-/
tinyCC sits on the esp8266?
GENIUS !!!!!
I just got an idea,... what would it take to transmit some pre designed (sdr recorded and decoded) data in 434MHz or 315MHz band.
Let just say that I would need to fake 4 unique (Manchester encoded FSK signals containing pressure, temperature, unique 32bit ID and crc)... And then transmitting it at about 1Hz... There would probably be a huge market for such device.
+Uroš Golob It would be difficult to pull off with this configuration as we're already reaching pretty far to get 60 MHz. Maybe there is another hardware configuration?
+CNLohr I was afraid of that, so dedicated hardware transmitter is probably only solution... they sell those for $6 on ebay,... that is still cheaper then 4 TPMS :)
this is really interesting! super epic! might wanna try it for myself with an esp8266 I bought a long time ago and never used!
can you use sort of the same method to get just normal composite video output?
Look up bitluni. He did it with an esp32, and composite. It looks way better.
I retract my statement of wanting to try it out because I've been trying for hours just to get the SDK and dependencies installed (I am super frustrated)
not even the github page instructions or tutorials on youtube are helping me... I'm a complete beginner here (I am also using the Ubuntu app for Windows, it seems to be working fine though so it shouldn't be an issue)
can you recommend me a place to go that might make the process a bit easier?
*tl;dr I can't upload the fancy code to the esp8266 because compiling it is a monumental pain in the behind*
it would be a great development platform if it had its own IDE or interface like Arduino or STM32CubeMX
@@jacksonshelton8055 Hmm, maybe in a few weeks I'll make a binary version of everything needed SDK wise and release it.
dude your my inspiration to continue programming! i wish i knew as much as you, all i have made with esp8266 is a smart watch using nodemcu lua interpreter it connects to an sntp then keep sthe time with the rtc modual :/ i wanna learn the espress if sdk now
it is crazy powerful!
i was wondering if you could do like a setup video on the espress if sdk, i mean im sure i could just figure it out but itd be nice, i may be moving to those esp8285 (thats the one with the embeded flash right?) like what would differ in the setup for a esp8266 vs a esp8285
It would be the same firmware, same... everything actually... except no flash chip needed.
How much work would have to be put into this in order to broadcast something beyond geometric shapes, say low res video/audio? A lot of fun could be had with that.
Audio is really hard with this since it requires a second carrier. There's just not enough bits to do it and make it sound good. As far as shapes, it wouldn't be that hard!
I am new with this so you could make a setup video? smooth a question so with this you can actually take over a TV sender?
If you watch the first video "Channel 3", it explains a little more, however, the general expectation is for you to use an ESP8266 board and flash the firmware in the description onto it. You may need more background with the ESP to get it all working. So maybe it'll take flashing other firmware first to get the hang of it.
You made a RF transmitter with just a cable, no additional components? What is the possible frequency range? Can you transmit a camera image? Can you transmit on 5.8 Ghz (FPV)? Wow I discovered this a week ago. I'm waiting for an ESP32-CAM, a NodeMCU, and an ESP-01 to arrive.
Nope. It has a hard time even getting spurs past 100mhz :-/
something very close to this is how Woz got the apple][ to display color. He had an actual analog color burst, but then got the pixel colors by faze offsetting a high freq sub-pixel digital signal.
I had thought about trying to do straight composite that way, but never got around to it. I had too much fun playing in the RF domain.
Could this work at baseband composite video? The standard is 1 volt peak to peak, so a resistor could drop the voltage from 3.3 to ~1. But what about the - voltage sync pulse?
Yep, sort of, NTSC doesn't really care if you go negative or not. But, that's not nearly as much fun.
you think there is enough power to encode say from usb keyboard to psk31 or feldhell or rtty then output baseband on ham radio bands 7-14 mhz?
I'm not sure, but I would expect so.
that is so badass! I had seen tvout for arduino and some other stuff. I'd like to see someone develop a little game console using this thing. Could you imagine playing something like tempest on that!? lol
would be pretty cool! I don't know how to drum up interest though :-/
Man, I wish I still had an electronics company so I could hire you to design something. Anything. I know you use all these technical words to hide the fact that you're just using magic...
CNLohr is it possible to use the ESP8266 as a OSD board ? I work with APM Quadcopters and OSD are super expensive and a pain in the ass to program, it would be amazing to be able to create a OSD to overlay simple text ( or even color text ) over the video signal.
does the ESP8266 have the nesesary hardware to sense the video carrier signal and be able to go over the same phase ?
+Andres Alvarez I never thought about using it as an OSD. Would the video generation device accept external synchronization information? Would the ESP just need to process and go from there? It would be very tricky because there is only one bit of output on the ESP :-/. Maybe with a little bit more hardware. Maybe it could just be an additive or subtractive OSD? I.e. making the text white or black only. But, I don't know if that would be useful.
most likely the video goest to fatshark fpv googles, or lcd screens inside a tool box as a "fly box station", check out the ardupilot mega project, APM mavlink osd, there is a protocol already done. The video is usualy generated by a analog ntsc camera, and the esp shoud sync over that video signal, so the signal that a arrives to the google is a "standar" ntsc signal
I can probably sync over an existing NTSC signal, however, I don't know anything about any of these projects or anything like that. I don't know if I can do anything other than adding white text, still :-/ If that's good enough this could be a suuuper cheap video overlay thing. I'll still have to look into it more.
+CNLohr Dude I love this chanel, I just bough 20 ESP and on the 1st day 1 finished and sold 20 diferent "wifi rgb lamps" to a guy that manufature fancy lamps, and he ordered me 50 more... long story short, Opensource is Great, but there is a lot of people who dont have the time go that path, they want to pay and to get the product done, even if you give them the parts and the instructions they wont figure it out. You can do a LOT of money with this color video overlay thing over ESP. Check out this 2 words " 250 FPV racers " " mavlink OSD ". there is a HUGE RC comunity and there is only 1 color OSD and nobody figure it out how to do it, well, you just did. I have lots and lots of projects where i need to overlay video over a standar signal, and max7456 is a pain... please let me know you email
+Andres Alvarez What I was saying was it is easy to do 1 color. It is much, much harder to do more colors. I'm honestly not sure how I would do it. If there's no market for 1 color, it's not really worth it in my book :-/
Would it be possible to give this thing a keyboard or something? Might be a really cool computer to use with old TV sets
Curious if you could take a video input and do this....
Could I just hook the RX pin up to composite video without broadcast?
You'd need the raw NTSC audio instead of the FM NTSC this one's using (since it's over RF).
Have you tried using a bandpass filter to get nicer signals?
+Michael Rußwurm No, I have not. Not as ridiculous as straight one's and zeroes... But, I really should consider trying it.
wanted to suggest this too, I'm thinking it could really benefit the video signal quality. can't really think of a way to make the source signal clearer. also, I see others have suggested that the small cap you removed might have had something to do with this...I'd keep it in mind...and I'd also keep in mind that with the B&W signal it didn't have such an impact. All in all this is a great achievement, hoping you won't stop
can we use this to display on recent samsung TVs ? or we only need old analog tv ?
As I show in the video, it works just fine on recent TVs.
Can you share your raw code instead of binary and which software to use to program in windows..??
Who can downvote this? Seriously, who the F can downvote this?!?
On the analog set it cares about timeing more for couler then the lcd
Any idea if just passing this signal into an amplifier would make the signal great?
It would certainly help.
so good
My ESP8266 is not outputing a wifi signal or a tv signal. Could you help me? I used esphome-flasher to upload it to my microcontroller.
You will need to connect by serial terminal and dump what it says. The baud rate at boot is 74880 or 75000 depending on which one your serial flasher supports.
@@CNLohr hi, I wish you answer my query.
I have raspberry and it's more powerful than attiny and esp8266, so I am wondering is it possible to broadcast raspberry Pi screen to analog tv channel 3
Is it broadcasting to the TV using antennas or using wires??
why is the dft mirrored around the carrier? I tried looking it up can couldn't find anything..
+drojf The DFT isn't mirrored around the carrier, the actual RF spectrum is like that. He's exploiting the sideband to get the 61.25 MHz output: by generating a (40 * 2 - 61.25 = ) 18.75 MHz signal on a 40 MHz carrier, the sideband is located at (40 * 2 - 18.75 = ) 61.25 MHz signal.
en.wikipedia.org/wiki/Sideband
+will11m The principle is the same, I'm just not sure the mechanism is the same. Though this doesn't look like exactly the mechanism, either, I think it's closer? en.wikipedia.org/wiki/Undersampling
Can I try adapt to work on TTGo VGA Esp32?
did you learn the reference from espressif sdk guide or somewere else?
+fun electronics videos I'm not sure what you are referring to? Learn what in particular?
HI, how can I flash this code to my nodemcu? I'm a complete noob
Can this chip be used as a tx for broadcasting composite input?
Not easily. You'd need some sort of RF frontend to do the reception... and it would be helpful if you had an ADC or something after a downconvert step.
Can you show us what happens when you Jam a incrementing number that increases every second?
Sounds like something you should go, download and test. Then make a video on :)
One problem. Don't have a ESP.
Hi, How to stream video signal using esp32? means RCA as input to esp32 and output want on web server. any link then please provide me. Thank you.
I don't have any examples of doing this on an ESP32 sorry :-/
What happened in the ending?
how to upload the bin files
U true hacker, dude!
You seriously should consider writing a book!!!
It takes a tremendous amount of effort and time for me to write even 2-4 page articles. A book would be a life's work for me :(
Yea ur on the route to become the next hybrid of Steve Jobs and Steve Wozniak!
I am missing the most important aspect. I don't do business well at all.
If you've got the knowledge; could you do a video on Artificial Neural Networks?
+Toomykins I have done some stuff with them, but not enough to make a video about them. If I ever actually use them on a project, though, I will explain more in the video.
Does this project use the same technique as the RasPi FM transmitter?www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter
So the transmitter has 1 bit resolution? (en.wikipedia.org/wiki/Quantization_(signal_processing))
+forfengeligfaen I think it's similar, but, you can dither the output. I don't really know how that relates to quantization. Yes, the pin is just 1 bit, but things average out over time.
This is going to sound stupid but is there anything specific to the ESP that keeps this project from being run on other arduous models? I'm still pretty new to arduino, despite all the success I've been having with it, I'm still getting my bearings -- at least for the details.
I've seen FM done over gpio on the raspberry pi, but this looks SSOOOO much more interesting :) pirate tv anyone? Ohh and what about codecs? My mind is a buzz now... Great.
You'll have to use an ESP8266 arduino, etc. But it can't use the arduino software, it's its own stack. No codecs or anything like that. This is just raw, moment-at-a-time bang it out to the TV.
+CNLohr +CNLohr after doing some more reading, and looking into things like avr studio it all makes a lot more sense :)
I still have a lot more reading todo as far as understanding even the basics of ntsc and the like. It's funny how there always have a new area of expertise in technology to learn about, at least it keeps life exciting.
If you do want to do NTSC on AVR-based arduinos, I do have other guides on that... but, to do it /in/ arduino land is pretty much impossible.
+CNLohr it's always better to have closer access to the hardware when coding -- the arduino abstraction of code is good for some things but there's a lot of overhead of course. I'm just now moving to arm assembly and the like -- not that much different from x86 or ppc, just a different chip, different features etc.
It's a little different on a smaller machines.
Are there any documents you used in your experiment? Or any resource you could point me to as far as how I could generate these signals on my own?
I'm waaaay more of a software person as far as my computer science background goes, but I love the electrical engineering aspect of experiments like these. That includes the alternative forms of circuit fabrication like you have here.
Not really, Just google images and wikipedia for NTSC analog broadcast TV, kolumbus has a REALLY good page on NTSC timing.
It's unfortunate that you did not do a version of you code to work under the Arduino platform
Arduino doesn't do well with really tight space and timing constraints. It's a property of the environment, not of me.
How do i need to upload the code then? what sdk have you got on the esp8266, just the original one or the nodemcu?
Please make a video connecting the image sensor to an ESP8266
+Estuar Gonzalez I don't really have a use for that, and I'm not really sure how I'd do it, so I don't think that is happening :-/
Do a how to video for this project..
wow that's is awesome :) :)
+Luis GCU Your unicode is showing up as square blocks.
not at me
i.gyazo.com/ba51e118030241479b6c754ad2e5e590.png
+gamerpaddy Thanks! Still broken for me. oh well.
+CNLohr they're smiley faces here
+AwesomeFriends56 Gaming edited. changed.
The effect at the end is caused by rc capacitance stuff.
I litterally shit myself.
WHAT THE FUCK MATE!
You are doing amazing things, thank you very much :D
Like!
Temperatures of ESP8266, please ?? BTW: Amazing project ! :)
temperatures?
Yes, I think temperature of the chip in high load.. :D
I don't actually know >.< but it wasn't hot or anything.
O.K :D Thank you very much !! :O :D :D
Can it also do PAL, pal?
I don't have the link handy, but someone has adopted it for PAL.
Try broadcasting Teletext now.
Work out a system to get the colors the same on every screen. Also try PAL, that sounds like a reasonable thing to do.
+AwesomeFriends56 Gaming It ain't that easy, pal :)
I'm well aware
+AwesomeFriends56 Gaming The PAL idea doesn't sound bad at all. But my pun was ruined, because i didn't use caps on pal... ehhh :) i really like those videos
This is something I only hope to understand one day. It's amusing to me. I really like the glass PCBs he's made.
I used to think I am a little bit good coder. But after watching your videos I've realized - I should die..
Nope. Just code more, a lot more. The more you code the better you'll be and I assure you you can be better than me!
2:32 *ehao* *veml* *eeo*
*RR*
Where does the code run?
+James Neave I'm not sure what you mean.
+CNLohr Well, the code looks like JavaScript? does it run on the device or does it seems machine code down over this web socket thing?
When simulating, it runs in javascript. It pushes the data from the table to the device. The thing runs perfectly happy without a web browser connected at all.
@@CNLohr
So the device itself executes JavaScript?
Is there a JS interpreter library on the ESP?
I ordered 3 of these today and I remembered about this video, didn't realise I had missed your response though!
@@CNLohr
I always wanted to have a go at this, not only PAL, but PAL + TELETEXT.
Who's on first?
Where Is The Code?
Look in the description.