#include <PID_v1_bc.h> // https://github.com/drf5n/Arduino-PID-Library
// Define the DAC and ADC pins
const int DAC_PIN = 0;
const int ADC_PIN = A0;
// Define the PID constants
double kp = 1.0; // Proportional constant
double ki = 0.0; // Integral constant
double kd = 0.0; // Derivative constant
// Define the setpoint and initial output voltage
double setpoint = 5.0;
double output_voltage = 5.0;
// Create the PID object
PID myPID(&analogRead(ADC_PIN), &output_voltage, &setpoint, kp, ki, kd, DIRECT);
void setup() {
// Initialize the DAC and ADC pins
analogWriteResolution(12); // Set the DAC resolution to 12 bits
analogReadResolution(12); // Set the ADC resolution to 12 bits
// Initialize the PID object
myPID.SetMode(AUTOMATIC);
}
void loop() {
// Read the current value of the analog signal using the ADC
double analog_value = analogRead(ADC_PIN) * (10.0 / 4095.0); // Convert the ADC reading to volts
// Set the setpoint value
setpoint = 5.0; // Replace this with your desired setpoint value
// Calculate the output voltage adjustment using the PID algorithm
myPID.Compute();
// Apply the output voltage adjustment to the DAC to adjust the output voltage
int output_dac_value = (int)(output_voltage * 4095.0 / 10.0); // Convert the voltage to DAC value
analogWrite(DAC_PIN, output_dac_value);
// Delay for a short period of time to allow the system to stabilize
delay(10);
}