/accessory_board

Interface board for the RPi3 (or whatever, really)

RPi3 Accessory Board

A basic interface device designed for the Raspberry Pi 3, built for students learning realtime development.

V1 device

Features

  • Five pushbuttons and two switches, with hardware debounce
  • Four LEDs
  • Speaker
  • BCD 7-Segment display
  • 10-Bit 4-channel SPI ADC
    • Potentiometer and phototransistor attached
  • Headers:
    • Power (both 3.3V and 5V)
    • SPI bus with one available chip-select line
    • UART
  • Labels:
    • Physical pin numbering
    • RPi3 pin numbering (BCM)
    • Speaker frequency range
    • ADC clock rate range

Designed with Fritzing, manufactured by Aisler (board ordering available here), and all parts sourced from DigiKey (cart export here)*.

Price is roughly $48 each, $62 per three boards, $28 per board for parts.

*Prototype LEDs sourced from Jameco, DigiKey LED quality has not been verified.