👀 Infrared Sensor (Obstacle Avoidance Module)

📌 Description

An infrared sensor is like the robot’s eyes. It sends out invisible light and checks if it bounces back. If something is in front of it, the sensor knows there’s an obstacle.

🎯 Use

In our projects, infrared sensors are used to:

• Detect walls or objects in front of the robot.
• Help the robot avoid crashes.
• Make smart decisions, like stopping or turning when something is close.

👉 Think of the infrared sensor as the robot’s radar — it helps the robot “see” without real eyes.

Module parameters

Pin name	Description
G	GND (Power Input Negative)
V	VCC (Power Input Cathode)
S	Digital signal pins
A	Analog signal pins

• Supply voltage: 3.3V/5V
• Connection: 2.54mm pin header
• Installation method: double screw fixing

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🖥️ Code Explanation

import machine
import time

pin17 = machine.Pin(17, machine.Pin.IN)   # Sensor connected to pin 17
pin26 = machine.Pin(26, machine.Pin.OUT)  # LED connected to pin 26

while True:
    if pin17.value() == 0:        # If sensor detects an obstacle
        pin26.value(1)            # Turn LED ON
        time.sleep_ms(200)        # Keep it on for 0.2 seconds
    else:
        pin26.value(0)            # Turn LED OFF

Step by Step

1. import machine & import time → Tools to control pins and add pauses.
2. pin17 = machine.Pin(17, machine.Pin.IN) → Pin 17 reads the sensor’s signal (input).
3. pin26 = machine.Pin(26, machine.Pin.OUT) → Pin 26 controls the LED (output).
4. while True: → Loop that repeats forever.
5. if pin17.value() == 0: → Checks if the sensor sees an obstacle.
6. pin26.value(1) → Turns the LED on (signal that something is detected).
7. time.sleep_ms(200) → Keeps the LED on for 0.2 seconds.
8. else: → If no obstacle is detected…
9. pin26.value(0) → Turns the LED off.

👉 Together, this makes the LED blink when the sensor detects an obstacle.

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✅ Conclusion of the Test

• If the LED lights up when something is placed in front of the sensor, the program is working correctly.
• This test shows how the board can read input from a sensor and react with an output (LED).
• Later, instead of just turning on a light, the robot could stop, turn, or change direction when it sees an obstacle.