Table of Contents

Simple Raspberry Pi Control With .NET IoT and Python

Follow the “Prerequisites” and “Prepare the hardware” instructions here. (Note: These instructions specify .NET SDK 5 or higher. We’ll actually be using .NET 6.)

Assumes that you’re using Linux on your development machine as well.

.NET

On the development machine, create a console application: 

dotnet new console -o BlinkTutorial
 
cd BlinkTutorial

Add the Iot.Device.Bindings package to the project: 

dotnet add package Iot.Device.Bindings --version 1.5.0-*

Replace the contents of Program.cs with the following code:

Program.cs
using System;
using System.Device.Gpio;
using System.Threading;
 
Console.WriteLine("Blinking LED. Press Ctrl+C to end.");
int pin = 18;
using var controller = new GpioController();
controller.OpenPin(pin, PinMode.Output);
bool ledOn = true;
while (true)
{
    controller.Write(pin, ((ledOn) ? PinValue.High : PinValue.Low));
    Thread.Sleep(1000);
    ledOn = !ledOn;
}

Make sure the application builds without errors: 

dotnet build

Publish it: 

dotnet publish -c Release -r linux-arm --self-contained true /p:PublishSingleFile=true

Copy the application to the Raspberry Pi (adjust the remote machine name and path as needed): 

scp -r bin/Release/net6.0/linux-arm/publish/* pi@raspi4-main:/home/pi/projects/BlinkTutorial

Log in to the Raspberry Pi, go to the publish directory, and run the application: 

ssh pi@raspi4-main
 
cd projects/BlinkTutorial
 
./BlinkTutorial

Enjoy the blinking light!

Makefile, to simplify the steps:

Makefile
REMOTE_USER_MACHINE = pi@raspi4-main
 
default:
	@echo 'Targets:'
	@echo '  build'
	@echo '  publish'
	@echo '  copy'
	@echo '  ssh'
 
build:
	dotnet build
 
publish:
	dotnet publish -c Release -r linux-arm --self-contained true /p:PublishSingleFile=true
 
copy:
	scp -r bin/Release/net6.0/linux-arm/publish/* $(REMOTE_USER_MACHINE):/home/pi/projects/BlinkTutorial
 
ssh:
	ssh $(REMOTE_USER_MACHINE)

Python

Log in to the Raspberry Pi: 

ssh pi@raspi4-main

Create a directory for the Python script: 

mkdir blink_tutorial
 
cd blink_tutorial

Install the gpio packages: 

sudo apt-get install python-rpi.gpio python3-rpi.gpio

Create the script:

blinking_led.py
#!/usr/bin/python3
 
import RPi.GPIO as GPIO
from time import sleep
 
gpio_pin = 18
pause_seconds = 1
 
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(gpio_pin, GPIO.OUT, initial=GPIO.LOW)
 
while True:
    GPIO.output(gpio_pin, GPIO.HIGH)
    sleep(pause_seconds)
 
    GPIO.output(gpio_pin, GPIO.LOW)
    sleep(pause_seconds)

Make the script executable, and run it: 

chmod u+x blinking_led.py
 
./blinking_led.py

Enjoy the blinking light! (Again!)

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