Experiment 17: Laser Sensor Experiment
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Contents
Arduino
Experimental Phenomenon
- The module emits a laser beam every 1 second.
Circuit Connection
Reference Program
#define SEN 2
void setup()
{
pinMode(SEN, OUTPUT);
}
void loop()
{
digitalWrite(SEN, HIGH);
delay(1000);
digitalWrite(SEN, LOW);
delay(1000);
}
Raspberry Pi
Circuit Connection
Program Execution
Python
- Install the gpiozero library
- You can use the following command to install the library:
sudo apt update sudo apt install python3-gpiozero
- For other systems on the Raspberry Pi, you can use the following command to install the library:
sudo pip3 install gpiozero
- Run the following command to view the GPIO pin definitions on the Raspberry Pi:
pinout
- Download the Raspberry Pi reference example, unzip the file, copy it to the user directory, and run it:
cd raspberrypi/17/python_gpiozero python laser.py
- At this point, you can see the Raspberry Pi running the program correctly. To exit, press ctrl+C.
- Command explanation: gpiozero.LED(pin, pwm, active_high, initial_value)
- Main parameters:
- pin: GPIO pin number,
- active_high:
- When set to True (default), connect the negative lead of the LED to GND and the other end to the GPIO pin.
- When set to False, connect the negative lead of the LED to the GPIO pin and the other end to the 3.3V pin.
- initial_value:
- If False (default), the LED is initially off.
- If None, the LED pin is in an unstable state.
- If True, the LED is initially on.
- Main parameters:
- For more commands, please refer to the gpiozero documentation
