Badge Labortage 2021

Idea: based on Swag Badge

The idea for this year's Labor badge is based on the Swag Badge from the Open Hardware Miniconf at linux.conf.au 2021.

They also released a DIY version named Dag Badge as well as the Swag Badge schematics.

PCB

This is our own PCB design. We will offer a basic kit with the PCB itself, the ESP32 D1 Mini board, 2 OLED displays, and 2 push buttons, to keep it simple and inexpensive. Anyone can purchase the additional parts if they like and we may have some left over from testing, and of course, feel free to fork and rework the PCB as you like, print it yourself, file PRs, or just leave some feedback.

Size (rounded): 94mm x 130mm

See the schematics for details.

ESP32 D1 Mini

The data sheet and documentation for the ESP32-WROOM-32 is publicly available.

Buy

https://www.az-delivery.de/products/esp32-d1-mini

Pinout

The ESP32 has VDET pins which can be used for ADC.

Firmware

Use the erase.sh script to clear the SPI flash and flash.sh script to flash:

./erase.sh
./flash.sh firmware-image.bin

NOTE: One common board is the MH-ET LIVE ESP32 MiniKit. In order to flash it, you need to short GPIO0 to GND and use the assigned /dev/ttyACM{n} device.

MicroPython

It's in beta and we were having trouble getting MQTT and WiFi to work reliably.

Use ampy to upload scripts. On many OS distributions, you can find a package for it.

NodeMCU

The ESP32 variant is also still in beta, though may do better then MicroPython. We haven't tested it yet, but it does boot up thus far.

Use nodemcu-tool to upload scripts. If you are using Arch Linux, you can use the package from the AUR. Otherwise, use the PKGBUILD as a reference for building it; mind that you may need to rebuild the native modules.

Here is a prebuilt image from the cloud build service.