Sinewave

// Copy this text to a new sketch in the Arduino software (clear the default ‘void loop etc first) and save as Sinewave.ino

// Simple DAC sine wave test, 7Hz

float pin = A12;
float freq = 5; // [Hz]
float adc_depth = 12;

void setup() {
  analogWriteResolution(adc_depth);
}

void loop() {
  float curr_time = millis() / 1000.0; // [s]
  float sinusoid = sin(2.0 * PI * freq * curr_time);
  int val = (sinusoid + 1) / 2.0 * pow(2, adc_depth);
  analogWrite(pin, val);
}