I Made A Tiny ESP32
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- เผยแพร่เมื่อ 15 พ.ค. 2024
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ok i joined my friend
If you want a slightly more functional challenge. Try putting the 'fingers' for a USB type A directly on the PCB so you can insert the entire PCB into a USB port, I've seen some bluetooth dongles do this.If you squeeze a WiFi antenna on there as well you'd have a pretty cool ESP-now receiver - could make for a pretty low latency wireless keyboard receiver or something like that.
also why buttons, just have pads that you can short with tweezers
@@X3msnakebtw i putted buttons on the dongle for convienience as it was intended for dev purpose, but i could have put smaller ones
@@X3msnake and i'm using a esp32-s2 instead of c3
would a flexible (embroidered?) wifi antenna work? I'm just thinking about project WarKitteh from a defcon talk a few years back, fitting a microcontroller with wifi into a cat collar.
@@charleslambert3368 yes many antennas are made from flex pcb, it would totaly work
You can easily ditch the reset button without any caveats. Just hold the programming button when inserting usb cable.
Dude, that is so simple and yet brilliant at the same time lol. I never would've thought of that. I guess to take it out of download mode after programming just unplug and replug in the USB.
@@paulprice Or ditch the buttons altogether and short two pads with the tip of a screwdriver.
It's a C3, you don't need either button. It can be reset to bootloader via USB
this is a great idea, @adamhowell1694 ! or some other type of much smaller switching mechanism :D
@CraigBurden1 I don't know if it's the same for the c3, but with s3 boards you can get them into a state where it crashes on boot and won't respond to USB to be rewritten and you need to reset it with hardware into download mode
Use flex PCB and make the back side as USB-A contact, after solder make a mold the size of PCB and fill the component side with acrylic.
Use the ESP8685 not the C3 (and not ESP8285 either), it's basically the C3 but in 4x4 mm QFN package.
Some decoupling capacitor can be omitted, the same with resistors on pin 2 and 8.
You don't need a BOOT switch when programming using USB-CDC, and you can just power cycle the thing in case of RESET switch, so both can be omitted.
Very nice little board. I'd remove the USB connector, buttons and possibly the LED. Instead if you put a U/FL connector for the antenna and a small board connector such as the Hirose DF40 series (a 20 pin is only 6.6 x 3.6mm) then far more GPIO could be broken out. Would need a seperate programmer board with the USB and reset buttons, but once programmed you'd have a very tiny board that could easily be integrated into other projects with only 1 connector and an antenna.
Thanks man, that's an interesting idea and one I'll consider. I've gotten a lot of great feedback thus far on how to improve this so I'm excited to make a 3rd revision of this.
I thought those looked familiar, it's what the cm4 uses, ig I should have expected a connection like that in this community lol
@@paulpriceThis has me excited, now fingers crossed🤞hoping I find the revised version on your channel
This is great - I thought I'd gone small with my latest boards, but I see that I have to try harder!
Am impressed by both of your ludicrously tiny boards.
Loved the close up shots of you populating the boards. Nice project, thumbs up and subscribed.
Even smaller would be castellations for GPIO, SMT pads for power, and a picoblade connector with USB breakout board. You could probably fit a battery charger where the USB connector used to be. You could also potentially fit a U.FL connector for wifi.
Simply wonderful, that's an elegant and compact ESP32 design, thank you!
Super awesome build!! Really cool to see you shrinky-dink the ESP32, even if it doesn't do BLE or WiFi
You can also pullout i2c pins for further expansion.
Delete the USB connector and make the board directly plug into a female USB connector like a cheap USB thumb drive.
It's a good idea, but I've got some other ideas as well that I'm going to try first. I'll be streaming tomorrow designing the 3rd version of this board. So stay tuned!
Well done, that's a pretty cool project. Cheers for sharing!
I guess you could push the footprint size even smaller by stacking the switches (using through hole) over the top of some of the other components.....🙂
I thought of maybe trying that early on, the only issue is the through hole part of it. The holes for the switches would interfere with the SOC itself. It's food for thought, but I'm not sure it will work at this scale. Not a bad idea tho!
would be interesting to tweak the design to have: power, SPI pins, and one of those tiny antenna jacks; that way it's mostly full featured
This is really cool. Thankyou for sharing, great vid!
Awesome. Looking forward to the third revision!
Small enough to place inside a computer as a key logger or inside a USB connector ..pretty dam tiny
I got my formal electronics education beginning in 1980. After all these years, I'm still convinced its magic.
Very cool design. Thanks for the video.
The challenge was great. I watched it with pleasure. Anyway, what I want is to add an sx1262 lora chip to this structure. Let's see if it will be the way I want it to be. I think the important thing is that it has an esp32 s3 centered structure (with sx1262 lora chip) and supports both arduino ide, esp idf and microphyton infrastructure. I think having so many programming infrastructure options will greatly increase the popularity of these boards. Especially if you consider the difference between the ESP version supported by the Arduino IDE and the version of the ESP IDF, you can understand what I mean more easily. This type of board will be extremely functional in education. In short, for example, it is a module structure that connects an sx1262 lora chip to esp32 s3 fn8. Esp32 should be designed to keep the GPIO pins active as much as possible. In a sense, think of it as a module. Then I think that this structure can form the center of many training sets.
I've been wondering how small of footprint a wifi enabled rs232/wifi adapter could be made. Id love to see that.
Crazy man - makes crazy things. Amazing project
Nice board!
I guess u can improve this if u going to use multi layer pcb, this way u can integrate wifi antenna on the board and also u can break out more pins like that!
Keep up, im interested how u done the next version as well, so i subbed!
looks great for model rockets or air craft
So proud of you!
Awesome! Add the ant with TINY packages and pogos instead of USB. @ D: I believe a design guide would be SWEET.
Very nice work. Couldn't you have the PCB manufacturer place the components for you?
Really awesome and inspiring, thanks for sharing.
Try to add a little SMA connector for the wifi antenna. So you save up the space and have WiFi supported
Wow!😯 Great project.
Incredible! I'm actually designing a business card using the same ESP32-C3 with the built-in flash! Epaper as display, wifi, RGB LED and even temp/humidity sensor : it's gonna be great!
It’s so cute! Great job!
Thank you! 😊
Wow. I am new to all this arduino and esp32 stuff as I just started a month ago but that is the coolest thing I have seen done to the esp32. Does it still have its ble capabilities and will you be sharing the schematics for the PCB. I would love to play around with it.
Excellent build! Have you considered a connector other than USB-C? Maybe JST has something which would work.
For WiFi, how about the ceramic antennas that Adafruit and Seeed use on the QTPy and Xiao series of boards? It would make your board larger, but not by much. Obviously this would be for another project where you aren't going for minimal space.
Thanks!
I've gotten some great feedback and ideas on how to improve this and I think I can make a new version with an antenna without making it bigger (hopefully) and not sacrificing any of the buttons/usb.
So stay tuned!
Great Video, thanks for sharing this
You could use use a male usb A pcb connector like some attiny85 designs do. You could only use one pcb site but you are not limited by the footprint of the usb micro port
is it possible to make something like LokSound 5 decoder for controlling light and sound and dc motor which can be controlled over wifi with esp32
And people thought there are no microchips in covid vaccine! Look how tiny this is! Great work man!
i see what you did there
I got my covid booster shot and my 5G connection got better.
It would be great to see this with the smaller components (replace the reset button with antenna connector) ... postpone your morning coffee until after populating the board ;-)
Great Project Man 💪
That's absolutely something I want to see!
I would change the pads for a flat cable connector so it can be actually useful haha Cool project tho
Just think... replace the usb-c for contacts for use a jig with pogo pins to programing and a small conector for a tiny battery, it's a option?
And for antenna, probably won't work, but you can put only de μC on one side, make a space for a connector for the antenna or... take all the risk, create a thin pcb for stackup at side of μC to save the space and have the antenna in separate pcb
I agree with the usb male "fingers" but remember you can also space out the connections to make it type 3 compatible. And with the extra space for the USB on one side, you might as well move the antenna to the other side. Another space saving constraint would be to put those castellated half holes. And maybe break out a few GPIO on the sides with the half size holes
You could even ditch the USB port and just use TX and RX pins!
Could you put a PCB Trace antenna for the WiFi on an internal layer? say as part of a 4-Layer design? Sure it won't be the best reception being burried in FR4 but it's better than no antenna at all?
I've got some new ideas for the next version thanks to a lot of great feedback on this video. So I think I can get an actual ceramic antenna on it without making it bigger (hopefully) so stay tuned!
Amazing work!
I love challenge for challenges sake, awesome work
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I was reminded of the even smaller ESP 8285 based ExpressLRS PP RX when I saw this 😅
If you make it even smaller, then maybe could me more space to add the bells and whistles back in?
maybe get rid of buttons all together and put just tiny pads that you can connect with screwdriver if you absolutely need to.
I've actually tried something like that in the past and had a hell of a time getting it to work. It's a good idea, I've just had trouble making it work before.
So what kind of Bluetooth range do you get without an aerial.
Is using an oven the best (only?) way to solder the second side of a board with surface mount components on both sides, or could you have used the hotplate for both sides?
I could have used a hot plate probably. I used higher temp past for the 1sr side and lower temp paste for the 2nd side. So it probably would've worked on a hot plate. But I have a reflow oven so I just do the 2nd side in there and not mess with it.
Could also just use a hot air gun for both sides
I see, so using two different pastes is what's important here. Could you share which two pastes you used? I'm curious what the reflow curves are like for each. Thanks and very cool project!
I'm away from my workshop right now so I don't remember the specifics paste product numbers off the top of my head. But one is a 428F paste and the other is like a 280F paste.
Does it stil have bluetooth capabilitys? cause if it has i i regret ordering the stuff for my smart ring project. Basically a ring that (when the button is pressed) sends data from an acelerometer, a magnetometer and a gyroscope via bluetooth. So you could just "wave" in the air and dimm the lights youre pointing at or move your hand up and down to controll the volume on your phone.
I used an attiny44 with an HJ-580LA bluetooth module for it and i cant figure out how to programm the HJ-580LA its way above my basic arduino skills :). A esp32 would have made it easyer.
This one does not have Bluetooth, but I've got a lot of great feedback about how to improve the design and potentially add a wifi/BT antenna so I plan on making a 3rd revision of this. Stay tuned!
Very cool, could make an esp a 4 pin i2c module hah
I know it would make it slightly bigger, but to increase the usefulness of this you could break out the two GPIO for I2C maybe instead of the one pin that you originally chose? New subscriber by the way. I love what you did with this.
Yeah so on the rev 1 board of this I did have 2 gpio for that very reason but when I decided to go as small as I thought I could I dropped it down to 1. But there's been some good ideas mentioned by others as well in the comments so ill probably try for a rev 3 and see what's possible.
@@paulprice Awesome!! Look forward to seeing it! Keep up the good work!!
Or possibly casselations along the PCB's edge, with the signal routed from an internal layer.
If you make it slightly bigger though, you essentially just have an Adafruit Qt Py or a Seeed Xiao. What makes this unique is its absolute minimal footprint.
Drop the through holes and switchs and use tiny pads for the gpio
Do you NEED buttons? 😊
Technically no, they're needed in the sense to put the board into programming mode, but that could be achieved using test pads. But that gets a little convoluted to program the board.
I'll probably revisit this and make something with no buttons or USB connector just for the hell of it, so stay tuned!
could you remake this with spi broken out ? I would love to have somenthing small that I could use in 3d prints... ( even if it is a bit bigger than this...)
honestly you could fit that thing into a charging cable and turn it into a badusb, its so tiny
I'd like to see a tiny ESP32 with 1mm pin full break out, canbus, USB, battery...all the stuff you usually get on an ESP32 breakout board. Antennas don't have to be on the surface of the board. You are already multilayer. Map them out so they are on the edges and internal. This tiny project is pretty cool, but to get it so tiny means seriously limited use!
you could make touch buttons and initioally connect them with a wire to falsh the chip but if you would make the edged conductive you could fit etleast 4 touch pads on there :D.
That's a very interesting idea with the touch pads.
I'm using the C3 variant because it's the smallest esp32 SOC I'm aware of and it doesn't have touch pins unfortunately, so the touch idea wouldn't work in this particular setup. But it's a good idea!
very very nice! If I had to choose a pinout with 4 pins, I'd go for I2C: VDD, GND, SDA and SCL. Endless possibilities!
Truly the best option out here.
I just want to see the kind of tiny project that warrants such a tiny esp32, like a 1/64th scale rc car
Would be awesome if it was set up so that you could sandwich other micro boards to increase functionality. Allowing you to run with just a basic esp32, or add other boards if you have the space available. Makes me think there could be a whole community around building out expansion micro boards. Very good work! I wish I knew enough about building boards and electronics, instead of going down the software engineering path.
Getting them i2c and i2s pins exposed would be awesome on this. Imagine the spy gadget you could make with these. Damn
Add external antenna to it with i2c pins
ah yes, a true microcontroller
Check out the expressLRS boards that are super tiny to get ideas for adding a ceramic or SMD antena
* could just stick a smd connector for the antenna also … the FPV ones have a nice solid type like the MMCX but normal ones are even smaller
… lol this is nice though, but you could get whompy with it and try and stick the ceramic antenna / connector on the Z axis ( side ) of the pcb, depending on how your routing the pins you could use a FPC connector from like a cellphone or whatever to break out them gpios
There is a manual cmd component installer based on pantograph mechanics. Remarkably eliminates hand shaking!!!
The mechanics can be assembled by yourself out of common junk, even out of wood!!! there is no need for high precision.
Sell one of these in your Tindie or if you have the PCB Gerber file and component list could you provide that? I am interested in shoving one in a USB cable, HDMI cable, etc...
Just 1? Haha, jk. I'm going to make a 3rd version and if things go well I may consider producing them. Stay tuned
Oh well I'll buy like 10-20 honestly haha! But after one I can see how the unit is built and attempt my own
The seed studio is making really tinny esp32 but this is half the size
Nice work
Thanks! :)
Nice, its smal enough to put in a 1:87 model car. I now use a wemos d1 mini for that but its a bit to big for most cars.
nice !!!
Hello good job mate! I do totally different jobs but i will be happy if i can try solder some of your smallest projects ever ! I dont have issue with solder but big issue with programming. How i can get some PCB the smallest you have to challenge my self also to use different Technics? Thank you !
You could ditch the usb port for test pads.. and with mini pogopins a custom connector to Program it :D
Yeah that's definitely a possibility! I've done that in the past with some projects. it's not as user friendly obviously. But it could be fun to try and push this even smaller! Stay tuned :)
@@paulpricemaybe even add a small antenna connector to it for bt and wifi if you change the port for a
"esp custom programmer" that connects to rx and tx and 3.3v and gnd pads interface
cool... however, still needs some way to put an antenna on it... even a wire would work no? or a uFl?
I plan on making a 3rd version with an antenna. So stay tuned!
HA
I have USB cables with plugs bigger than that whole board. Impressive work.
Now we need like keychain stream viewers or some kind of micro display to go with it.
It'd be super interesting to see how small you could get this :O
It would be really useful to have such a tiny board with wifi. I think the SMD antennas can be pretty small. Maybe it would fit if you ditch the reset button.
Excellent sir ❤❤
Big fan
Is this board contains WiFi facilities also
Please reply
Use smd antenna that is on the esp32 c3 mini dev board, no need of buttons just expose two solder pads and any tweezer can be used to trigger flash,
I could argue that microusb port can also be ditched and temporary wire solder or some hacky 4pin alligator style clip can be used to program it but it might trigger some people,
Also check deep sleep as you used your own schematics and different capacitors can cause rise/fall timings on rst pin to change and make deep sleep unusable
Just realized that everyone else basically said the same things, very pleasantly surprised, wonder why manufacturers are not thinking that not everyone needs pampered dev boards
I think you could get an antenna in it, if you use a multi-layered pcb.
How do you figure? It's already a 4 layer PCB.
@@paulprice I didn't. It was a bold assumption.
@@ikemkrueger ah gotcha. Thanks for the ideas regardless.
What about 6 layer??
First : you don't need a usb connector, it's just one time use! So make a J-tag Like pins.
Second: you don't need buttons either! Unless the project requires! Instead just use a pins for programing mode.
Now you have a completely empty side for a nice wifi antenna!!!
Those are some good ideas for sure. I think I'll have a go at a 3rd revision and see if we can't get an antenna on there somehow.
Where did you source that esp32? It looks like the pico d4 form factor but it's not?
alibaba
merci beaucoup. tres interessant. Super!!!
Can you layer PCBs to break out all of your I/O and add a ceramic antenna? The footprint would not change it would just become thicker.
I think this is the sort of route I'm going to go but with a twist. So stay tuned!
@@paulprice There is also the method shown in the HAD article _"DEAD-BUG ARDUINO IS STILL BREADBOARD READY"_
You could make it smaller without the mini-mini-components, by exploring the third dimension: You could fit all your discrete components within the area of the IC: You'd need a board ontop of it, and the token LED could be SMT, while the token buttons could be contact pads to connect with a metal tool. Of course, the IC itself is smaller within its package, so you could shave that down a bit.
At this stage, it might be better to add functionality rather than just reducing size, eg some of whatever you're plugging the microcontroller into. It would also be getting smaller than a standard USB connector.
Ten+ years ago, ARM put a full processor inside a pen. You'd write with the pen, and it'd record the nib's movements, which you could then download.
For wifi antenna, throw a MHF1/u.FL connector (or mhf4). Should be a smaller footprint than one of your buttons.
you can try to reduce the shaking of one hand by holding this hand with your other hand - it sort of wipes out the shaking smiliar to noise (destructive interference)
I see a lot components there. Capacitors, resistors. Can you list what elements are absolutely essential and describe why that one is really needed. I can get the need of chip itself and quartz. But the rest?
Great question! The majority of the capacitors and 1 resistor is for the voltage regulator and power filtering. Could I get rid of the power filtering and have it still work? Probably, but it also probably wouldn't work reliably. 1 resistor is required to pull gpio8 high in order to program the board. (That was the issue with the 1st rev I made) and then there are a few resistors for the crystal.
So while I may be able to remove a capacitor or two, it wouldn't shrink the footprint at all, unfortunately.
@@paulprice I am talking not from the position of making it smaller but to start making custom pcb's for own projects instead of using generic development boards. Because with generic boards projects start look ugly too fast. Trying to get into what is needed. Schematic in the datasheet has zero resistance resistors on many lines, why would I need them?
This is super awesome, tho i would love to see a version that can extend gpio count, and also can connect with LTE + battery
Subscribed! ❤
Thanks! I plan on making a 3rd version with those added, so stay tuned!
Hi,
How did you manage to solder the bottom side without the top side components falling off?
Different melting temperature solder paste?
Correct, 1st side uses a high temp solder paste and the 2nd side used a lower temp solder
Hello Paul - where to buy this one creation of yours which you showed in the video
that´s some impressive work. Could you even make a matchbox 486 dx 100 with s3+3d that could actually install win98 and run retro games? sure the hdd may need to be a tiny thumb drive or a separate ssd, but still.The smallest ever retro gaming pc with "original" but redesigned chips, that do exactly what the bulky pc components did but with modern 5-12nm chip manufacturing methods? Can that even be done, are the designs for the old pc stuff in public domain yet?
awesome board you made! but esp32c3 will eat 80-100ma of power during wifi or bluetooth. will you fix this?
Amazing
Any thoughts of putting ithe esp32t in a usb-form-factor, like the tomu , fomu , Qomu (crowd supply)?
does no antenna mean no radio or does this still work with limited range? (think first one?)
No antenna means no signal period unfortunately.
@@paulpricemay be not exactly true, if you set the lowest possible tx power it works with a very short piece of trace (of course with a limited range) so probably might work without it too
I only read about this so maybe missed something. So the wifi and bt dont work? And only 1 pin? Somewhere i fail to see what this is good for unless a ultra simple thing. But yes at least add the i2c or qwiic or what they call it. And antenna connection. I think there are micro buttons for the side of the pcb. Maybe a very fine pitched connector?
This was only a proof of concept type build. I've gotten a lot of great ideas from people on here and I think I can make a 3rd version that has an antenna and more gpio without making it bigger (hopefully) while also not lose the usb/buttons. It's a challenge but I'm looking forward to trying so stay tuned!
You probably don't need a full on usb-c port either. You can use breakout pins. If you power the board externally, maybe with a powerbank, you can probably get away with just + and - data pins with usb