This is a custom - Arduino uno - based circuit.
- Microcontroller: Atmel ATMega328p
- Bluetooth Module: Support HC-06 & HC-05
- Motor Driver IC: Two L293D (up to 4 DC motors or up to 2 stepper motors)
- Servo motor header
- 3 input/output pins (Can be used to connect LEDs or button SWs)
- Programmable header
- Reset button
Just simple pcb designed for custom application with Raspberry Pi
"Raspberry pi Custom Shield" that I have shared is a pcb with custom pin gpio selection to screw block connection, two relays drived to GPIO20 and GPIO 21, an RTC to give correct data to Raspberry.
Schematic and PCB file of "USB expander" show one my solutionon to expand USB and add two serial door connection to raspberry PI.