Experiment 3: Rotary Potentiometer Experiment
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Contents
Arduino
Experimental Phenomenon
- Print the voltage value at the sliding end of the potentiometer via serial port.
Circuit Connection
Reference Program
#define Pot A0 // Name the potentiometer pin
int PotBuffer = 0; // Buffer variable for AD reading data
void setup()
{
Serial.begin(9600); // Initialize serial port baud rate to 9600
}
void loop()
{
PotBuffer = analogRead(Pot); // Read AD value
Serial.print("Pot = "); // Output "Pot = " via serial port
Serial.println(PotBuffer); // Output the value of PotBuffer via serial port
delay(500); // Delay for 500ms
Serial.print("Value = "); // Output "Value = " via serial port
Serial.print(PotBuffer*5.0/1024); // Output the calculated voltage value via serial port
Serial.println("V"); // Output "V" via serial port
delay(500); // Delay for 500ms
}
Raspberry Pi
Circuit Connection
Program Execution
Python
- Install the gpiozero library
- You can install the library using the following command:
sudo apt update sudo apt install python3-gpiozero
- For other systems on Raspberry Pi, you can install the library using the following command:
sudo pip3 install gpiozero
- Run the following command to view the GPIO pin definitions on the Raspberry Pi:
pinout
- Enable the SPI interface
sudo raspi-config Select Interfaces Options -> SPI -> "Would you like the SPI interface to be enabled?" Choose Yes -> "The SPI interface is enabled" Choose Yes -> Select finish
- Shut down the Raspberry Pi. With the power off, connect the corresponding modules to the circuit according to the provided circuit diagram, then start the Raspberry Pi.
- Download the Raspberry Pi reference example, unzip the file, copy it to the user directory, and run:
cd /home/pi/raspberrypi/3/python_gpiozero python Potentiometer.py
- At this point, you should see the Raspberry Pi continuously printing the voltage value of the potentiometer. To exit, press ctrl+C.
- For more commands, please refer to the gpiozero documentation
