// Doppler radar w/ATtiny412
//
#define radarPin D10  //Doppler OUT connected to PA3
const int rLED = D8;   // red LED

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);    // baudrate 9600 bps
  pinMode(radarPin,INPUT);
  pinMode(rLED, OUTPUT);
}

void loop() {
  // wait for radarPin to go HIGH = motion detected
  while (digitalRead(radarPin) == LOW);
  // motion detected, send 'Motion detected' out through serial port
  Serial.println('Motion detected!');
  digitalWrite(rLED, HIGH);
  delay(100);

  //wait for radarPin to go LOW again = no motion
  while (digitalRead(radarPin) == HIGH);
  //no motion, send '0' out through serial port
  Serial.println('No motion');
  digitalWrite(rLED, LOW);
}