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Pi-compatible GPIO ESP32 board

Posted: Mon Apr 01, 2019 5:13 am
by tonymac32
After spending some time playing with the ESP32, I wanted to use it with some of the hardware I have laying around, namely Raspberry Pi compatible hats. I primarily work with single board computers these days, so that hardware is plentiful, and the cases are easily acquired. I decided to go ahead and develop a board, and to go all the way, making it fit the cases, program/power via the micro-USB, etc:


The bottom one is a prototype before I made it able to handle the WROVER-B. The current board will support either.

Independent 3.3V supplies for the GPIO and the ESP32 helps a little with supply noise, the boards I'm waiting on have solder jumpers to bypass the low pass filter and DC blocking caps in case you want to do something more interesting than output questionable quality audio.

Tested: I2C/SPI/GPIO functionality and an I2S DAC (The adafruit 3W amplifier one and the Pimoroni "Phat DAC")

MicroUSB is power and has the silicon labs USB-->UART on board, reset/program handled via the USB interface or, if desired, a UART can be used with the TX/RX on the 40-pin GPIO and you can use the buttons. All the GPIO of the 16-bit expander are available, all headers provide Gnd/3.3V/5V.

I've used MicroPython, the Arduino core, and Ka-Radio to test out the hardware.

This design will be released under the CERN OHL license, I am working on a campaign to be able to bring these to some level of production first, and I recently discovered the Snap EDA licensing is not friendly to sharing the original design files on sites like Github, so I need to "clean" my project of any of their symbols/3D models before I can upload.

I had named this project "ESPi32", however I found another project idea on here posted about a year ago with that name when I started searching around to make sure I wasn't going to run into trouble. (Hence the tape on the boards pictured, I don't want anything with that name on it out there to avoid confusion/controversy) As I'm no good at naming things and like geology, I'm simply calling it Obsidian ESP32. It's black and has an ESP32 on it.

A final thought, reflow soldering on a hotplate works amazingly well, but I still hate being a human pick and place. I'm getting a quote on 10 fully assembled units now to walk through the process and assess the quality I get back.

Re: Pi-compatible GPIO ESP32 board

Posted: Tue Jun 18, 2019 5:12 am
by tonymac32
It's been some time, with everything else I didn't keep this updated. If I shouldn't post back/back regardless of time elapsed I apologize.

I am launching a campaign for these boards on CrowdSupply, as mentioned before the hardware will be released under the CERN OHL v1.2 sometime during / at the conclusion of the campaign, depending on when I get the documentation presentable for public consumption.

If you would like to take a look, ... dian-esp32

And some light flashing/motor spinning/Google Pinging from a SPI ethernet adapter at my Twitter handle @tonymac_32