HAT or pHAT for Raspberry Pi. Designed with the Pi Zero W in mind, so it shares the footprint of the Zero.
HAT has an ATmega328PB connected via I2C, SPI and UART,allowing both flashing, and many forms of communication.
Included a space for a Mini DC-DC voltage regulator. These are good for 3A of power, but make sure to solder the 5V pads and cut the ADJ pad lead.
Headers for SPI(ICSP) and both...
A stepped-motor controller for three steppers using Trinamics 2130 compatible "SilentStepSticks". Also supports upto two hobby servos and has two power FETs for on/off control of loads (including inductive ones).
Can be used stand-alone using the ESP32 on-board which supports WiFi and a web-based UI when running the [companion software called RBotFirmware](https://github.com/robdobsn/RBotFirmware)...
This is a Raspberry Pi Zero W hat/shield with USB MIDI input, stereo audio output, 3 user-configurable buttons and OLED display.
To use as an audio card, enable PWM audio output by adding `dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4` at the end of *config.txt* file.
Remeber that HDMI audio output is the default; use `raspi-config` to force output to 3.5mm audio jack.
If you can't find 47uF...
This is a Stepper HAT for Raspberry Pi or stand-alone use. It is the board I'm currently using in my SandBot [SandBot](https://robdobson.com/2018/08/a-new-sandbot/) and provides two SilentStepStick TMC2100 positions, two FET drivers for LED light strip or similar and two servo ports. Software is here: [RBotFirmware](https://github.com/robdobsn/RBotFirmware)