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GPIO Project 10 - IR Project

Beginner

30 Minuten

114,90

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 is controlled by specific buttons on the remote control.

Connection diagram

Connect the IR sensor:

VCC (or +): Connect to 3.3V (pin 1). span>
GND (or -): Connect toGND (pin 6).
OUT: Connect withGPIO 17 (pin 11).

Connect the LED:

Long leg (anode):
- Connect via a 220Ω resistor to GPIO 27 (pin 13).
Short leg (cathode):
- Connect toGND (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	Nutrition	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 IR function

Open the configuration menu:

sudo raspi-config

2. Go toInterface Options > Enable IR and turn it on.
3. Restart 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 greenRun button (▶) at the top the Thonny interface.

How does it work?

IR sensor:
- Receives the infrared signal from the remote control.
- When a button is pressed, the sensor sends a signal to GPIO 17.
LED:
- The LED turns on when the IR sensor receives a signal receives.
Repeat:
- The program continuously checks whether a signal is coming in 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

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