AD620 amplifier

/*
This code reads the analog value from the input pin using the analogRead() function. The voltage variable is calculated by multiplying the analog value by the reference voltage (5V) and dividing by the maximum analog value (1023).

The amplified voltage is calculated by multiplying the input voltage by the gain factor, which is equal to 1 plus the ratio of the gain resistor value to 1 kOhm. In this example, the gain resistor value is set to 1 kOhm.

The input and output voltages are printed to the serial port using the Serial.println() function.

The amplified voltage is written to the output pin using the analogWrite() function. The output voltage is scaled to the range of 0 to 255 by multiplying by a factor of 51 (255/5).

A short delay is added using the delay() function before the loop starts again.

This code provides a basic framework for interfacing with the AD620 amplifier using an Arduino. You can modify the code to suit your specific requirements, such as adjusting the gain resistor value or adding filtering to the input signal.
*/

// define the amplifier pins
const int AMP_IN = A0;
const int AMP_OUT = A1;

// define the gain resistor value
const float GAIN_RESISTOR = 1000.0; // 1 kOhm

void setup() {
  // initialize the serial port for debugging
  Serial.begin(9600);

  // print a message to the serial port
  Serial.println("AD620 Amplifier ready!");
}

void loop() {
  // read the analog value from the input pin
  int analogValue = analogRead(AMP_IN);

  // calculate the voltage based on the analog value and the reference voltage
  float voltage = analogValue * (5.0 / 1023.0);

  // calculate the amplified voltage based on the gain resistor value
  float amplifiedVoltage = voltage * (1 + (GAIN_RESISTOR / 1000.0));

  // print the input and output voltages to the serial port
  Serial.print("Input voltage: ");
  Serial.print(voltage);
  Serial.print("V, Output voltage: ");
  Serial.print(amplifiedVoltage);
  Serial.println("V");

  // write the amplified voltage to the output pin
  analogWrite(AMP_OUT, amplifiedVoltage * 51.0);

  // wait for a short time
  delay(100);
}