GitHub - melastmohican/rust-rpico2-embassy-examples: rust-rpico2-embassy-examples Rust Embassy examples for Raspberry Pi Pico 2

This repository contains examples for the Raspberry Pi Pico 2 (RP2350) board, written in Rust using the Embassy async framework. Project generated cargo generate --git https://github.com/ImplFerris/pico2-template.git --name rust-rpico2-embassy-examples Hardware Board: Raspberry Pi Pico 2

MCU: RP2350 (Dual-core Arm Cortex-M33 and RISC-V cores) On-board peripherals:

LED on GPIO25

Pinout

Common Pin Assignments

I2C pins:

I2C0 SDA: GPIO4 I2C0 SCL: GPIO5 I2C1 SDA: GPIO2 I2C1 SCL: GPIO3

UART pins:

UART0 TX: GPIO0, UART0 RX: GPIO1 UART1 TX: GPIO8, UART1 RX: GPIO9

Examples I2C Examples hs3003_i2c Reads temperature and humidity from an HS3003 sensor using the Embassy async framework. cargo run --example hs3003_i2c Wiring (Arduino Modulino Thermo): Modulino -> RPi Pico 2 ---------- -------------- GND (black) -> GND VCC (red) -> 3.3V SCL (yellow)-> GPIO5 (Pin 7) (I2C0 SCL) SDA (blue) -> GPIO4 (Pin 6) (I2C0 SDA)

About HS3003: The Renesas HS3003 is a high-performance temperature and humidity sensor:

Temperature range: -40°C to +125°C (±0.2°C accuracy) Humidity range: 0% to 100% RH (±1.5% accuracy) 14-bit resolution for both measurements Ultra-low power consumption

adxl345_i2c Reads accelerometer data from an ADXL345 sensor over I2C0 using Embassy.

cargo run --example adxl345_i2c Wiring: ADXL345 -> RPi Pico 2 ---------- -------------- GND (black) -> GND VCC (red) -> 3.3V SCL (yellow)-> GPIO5 (Pin 7) (I2C0 SCL) SDA (blue) -> GPIO4 (Pin 6) (I2C0 SDA)

About ADXL345: The ADXL345 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is accessible through either an SPI (3- or 4-wire) or I2C digital interface. SPI Display Examples zermatt Displays a 320x240 image of Zermatt on the Adafruit 2.2" TFT LCD display in landscape mode. cargo run --example zermatt Wiring (Eye-SPI Breakout): Raspberry Pi Pico 2 Eye-SPI Breakout +-----------------------+ +---------------------------+ | | | | | 3V3 (Pin 36) --------+------+-> VIN (Red Wire) | | GND (Pin 38) --------+------+-> GND (Black Wire) | | GPIO18 (Pin 24) -----+------+-> SCK (Blue Wire) | | GPIO19 (Pin 25) -----+------+-> MOSI (Green Wire) | | GPIO16 (Pin 21) -----+------+-> MISO (Yellow Wire) | | GPIO20

(Pin 26) -----+------+-> DC (White Wire) | | GPIO21 (Pin 27) -----+------+-> RST (Orange Wire) | | GPIO17 (Pin 22) -----+------+-> TCS (Blue Wire) | | | | | +-----------------------+ +---------------------------+

zermatt_snow Displays a 320x240 image of Zermatt on the Adafruit 2.2" TFT LCD display with animated falling snow, utilizing a physics engine and the Embassy async framework to draw to an off-screen lcd-async framebuffer and dispatch via DMA without blocking the CPU. cargo run --example zermatt_snow Wiring is identical to the zermatt example. 1-Wire Examples ds18b20 Reads temperature from a DS18B20 waterproof temperature sensor probe over a 1-Wire bus using Embassy. It utilizes a custom, cycle-accurate PreciseDelay implementation to achieve jitter-free sub-microsecond timing required by the 1-Wire protocol on the RP2350's Cortex-M33 core. cargo run --example ds18b20 Wiring Schematic: Raspberry Pi Pico 2 +-----------------------+ | | | [ ] 1 40 [ ] USB | | [ ] 2 39 [ ] | | [ ] 3 38 [G]ND --+-------+ (black) | [ ] 4 37 [ ] | | | [ ] 5 36 [3]V3 --+---+ | | ... ... | | | | [ ] 20 21 [ ] ----+---+---|---+ (white, GPIO16) +-----------------------+ | | | | | | | | | +-----------------------------+ | | | |

DS18B20 Sensor / Probe | | | | | (Bottom/Flat Side) | | | | | | | | | | [GND] [DAT] [VCC] | | | | +-------|-------|-------|-----+ | | | | | | | | | | +-------+--[5K1]----+ | (Pull-Up Resistor | | | Resistor | between DAT & VCC) | | +---------------+ (red) +-------|-----------------------+ (black) | +--------------------------- (white)

Breadboard Layout:

About DS18B20: The DS18B20 is a 1-Wire digital thermometer that provides 9-bit to 12-bit Celsius temperature measurements. It communicates over a 1-Wire bus, requiring only one data line (and ground) to interface with the microcontroller. It has a temperature range of -55°C to +125°C with ±0.5°C accuracy from -10°C to +85°C. dht11 Reads temperature and humidity from a DHT11 sensor using the Embassy async framework. It utilizes the async API of the dht-sensor crate combined with our cycle-accurate PreciseDelay implementation. cargo run --example dht11 --release Note: Due to timing sensitivity of the DHT11 protocol during the bit-read phase, you must run this example in release mode.

Wiring Schematic: Raspberry Pi Pico 2 DHT11 Module +---------------------+ +---------------------+ | | | | | GND (Pin 38) -------+----->| GND | | 3V3 (Pin 36) -------+----->| VCC | | GPIO16 (Pin 21) ----+----->| DAT (Data) | | | | | +---------------------+ +---------------------+

ImportantPull-up Resistor:

If using a DHT11 module board: It likely already has a built-in pull-up resistor. No extra component is needed. If using a bare 4-pin DHT11 sensor: You must add an external 4.7kΩ to 10kΩ pull-up resistor between the DAT (Data) and VCC lines.

About DHT11: The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). It has a temperature range of 0°C to 50°C (±2°C accuracy) and humidity range of 20% to 90% RH (±5% accuracy). Wi-Fi & Matter Examples matter_wifi_light Implements a Matter-compatible Wi-Fi light bulb using the rs-matter stack. It uses BLE for commissioning and Wi-Fi for network connectivity, allowing you to add the Pico 2 W directly into Apple Home, Google Home, or Home Assistant! When toggled from your smart home app, it turns an external LED on and off. cargo run --example matter_wifi_light --release Provisioning in Home Assistant:

Run the example on your Pico 2 W. It will begin advertising over Bluetooth.

Open the Home Assistant companion app on your smartphone.

Go to Settings -> Devices & Services -> Add Integration -> Add Matter device.

When prompted for a setup code, enter the default 3497-0112-332 (or scan the QR code link printed in the terminal logs).

Home Assistant will connect to the Pico 2 W over BLE, ask for your Wi-Fi credentials, and securely transmit them to the device.

The Pico 2 W will connect to your Wi-Fi network and immediately appear as a standard light bulb. You can use the Home Assistant interface to toggle the light on and off!

The external LED wired to your Pico 2 W will instantly mirror the state!

Wiring Schematic: Raspberry Pi Pico 2 W External Components +------------------------+ | | | GP15 (Pin 20) |---------[ 220-330 Ohm Resistor ]-----+ | | | | GND (Pin 18) |------------------[ LED - ] <---+ | | | | | +------------------------+ (Cathode / | | Short Leg) | | | | [ LED + ] -+-----+ (Anode / Long Leg)

Basic GPIO Examples blinky Blinks an external LED connected to GPIO15. This is useful for boards like the Raspberry Pi Pico 2 W, where the onboard LED is connected to the wireless chip rather than a standard microcontroller GPIO. cargo run --example blinky Wiring: Same wiring as the matter_wifi_light example.