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GPIO Project 10 - IR Project

Beginner
30 Minuten
€167.09

In this project you will learn how to use an infrared (IR) receiver and a remote control to trigger actions on a Raspberry Pi . We will use an LED as output (which you can find in the GPIO kit ) which is controlled by specific buttons on the remote control.

Connection diagram

Connect the IR sensor:

  1. VCC (or +) : Connect to 3.3V (pin 1) .
  2. GND (or -) : Connect to GND (pin 6) .
  3. OUT : Connect to GPIO 17 (pin 11) .

Connect the LED:

  1. Long leg (anode) :
    • Connect via a 220Ω resistor to GPIO 27 (pin 13) .
  2. Short leg (cathode) :
    • Connect to GND (pin 6) .

Pinout Reference

GPIO

Pin #

Function

Connection

GPIO 17 Pin 11 Input IR sensor (OUT)
GPIO 27 Pin 13 Output LED
3.3V Pin 1 Power supply IR sensor (VCC)
GND Pin 6 Earth (Ground) IR sensor and LED

Preparation

Step 1: Install required packages

Open a terminal and run the following commands to install the required IR library:

sudo apt-get update
sudo apt-get install lirc

Step 2: Activate the IR function

  1. Open the configuration menu:
sudo raspi-config

2. Go to Interface Options > Enable IR and turn it on.
3. Reboot the Raspberry Pi .

Python code in Thonny

Step 1: Write your code

Open the Thonny Python IDE and enter the following code:

import RPi.GPIO as GPIO
from time import sleep

# GPIO-instellingen
IR_SENSOR_PIN = 17
LED_PIN = 27

GPIO.setmode(GPIO.BCM)
GPIO.setup(IR_SENSOR_PIN, GPIO.IN)  # IR-sensor als input
GPIO.setup(LED_PIN, GPIO.OUT)      # LED als output

try:
    print("Druk op een knop op de afstandsbediening...")
    while True:
        if GPIO.input(IR_SENSOR_PIN) == GPIO.LOW:  # Detectie van een signaal
            print("IR-signaal ontvangen!")
            GPIO.output(LED_PIN, GPIO.HIGH)  # Zet LED aan
            sleep(1)                         # Houd LED 1 seconde aan
            GPIO.output(LED_PIN, GPIO.LOW)   # Zet LED uit
        else:
            GPIO.output(LED_PIN, GPIO.LOW)   # Houd LED uit als geen signaal

except KeyboardInterrupt:
    print("\nProgramma gestopt.")
finally:
    GPIO.cleanup()  # Reset de GPIO-instellingen

Step 2: Save the file

Click File > Save As and name the file ir_project.py .

Step 3: Run the script

Click the green Run button (▶) at the top of the Thonny interface.

How does it work?

  1. IR sensor:
    • Receives the infrared signal from the remote control.
    • When a button is pressed, the sensor sends a signal to GPIO 17.
  2. LED:
    • The LED turns on as soon as the IR sensor receives a signal.
  3. Repetition:
    • The program continuously checks whether a signal is coming from the remote control.

Result

  • Button pressed : The LED turns on for 1 second and then turns off.
  • No button pressed : The LED remains off.

Experimenting

  1. Recognize different buttons:
    • Add a library like lirc or pylirc to detect specific buttons and associate different actions.
  2. More output devices:
    • Use multiple LEDs or other devices, such as a buzzer, to respond to different buttons.
  3. Log button codes:
    • Log the received IR codes to identify specific buttons on the remote control.

Required products