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PicoRuby RP2040 Peripheral Demo

Peripherals

  • GPIO: Raspberr Pi Pico on-board LED
  • UART: FTDI USB to TTL Serial Adapter Cable (3.3V)
  • I2C: PCF8523 RTC module
  • ADC: RP2040 on-chip temperature sensor

Wiring

Note: The wire colors in the picture and in the table are different.

Function Raspi Pico Peripheral
GPIO GPIO 25 (Connected internally) LED
UART GPIO 0 Serial Adapter RX (Yellow)
UART GPIO 1 Serial Adapter TX (Orange)
UART GND Serial Adapter GND (Black)
VBUS(5V) Serial Adapter VCC (Red)1
I2C GPIO 4 PCF8523 SDA
I2C GPIO 5 PCF8523 SCL
I2C GND PCF8523 GND
I2C VBUS(5V)2 PCF8523 VCC
ADC ADC4 (Connected internally) Temperature sensor

Build by yourself or use a release binary

Prerequisites

  • CMake
  • raspberrypi/pico-sdk
    • tag 1.5.0
    • PICO_SDK_PATH
  • Raspberry Pi Pico
    • Other RP2040 boards should work making sure to connect appropriate pins

Build

git clone this repo and cd into it.

rake

Then you'll get build/PicoRuby-RP2040-Peripheral-Demo.uf2.

Install and run

  • Install PicoRuby-RP2040-Peripheral-Demo.uf2 into RP2040
  • Connect the USB serial cable to the host PC
  • Open a serial terminal with values below:
    entry value
    Baudrate 115200
    Data bits 8
    Stop bits 1
    Parity none
    Flow control none
  • Start RP2040 by connecting a power or pushing the reset button

Usage

You can figure it out in mrblib/app.rb

COM18.-.Tera.Term.VT.2023-04-04.14-47-29.mp4

Footnotes

  1. Optional. Connect if you want to supply bus power from the cable ↩

  2. 3V3 also should work though, 5V would be better for the reliability of switching over from battery ↩