unsigned long t = 0;

void setup() {
  Serial.begin(115200);
}

void loop() {
  float y1 = (1*sin(180.0 / M_PI * t++ + 0));
  int i = (32 * y1)+32;
  //int i = map(y1, -1.0, 1.0, 0, 64);
  Serial.print(y1); Serial.print(" -> "); Serial.println(i);
  delay(5);
}