Basic imp <--> Arduino code example

ArduinoUART.device.nut

// electric imp device code
server.log("Device Started");

arduino <- hardware.uart57;

function arduinoData() {
    local b = arduino.read();
    while(b != -1) {
        local state = "Unknown";
        if (b == 0x10) state = "Off";
        if (b == 0x11) state = "On"
        server.log("LED: " + state);
        b = arduino.read();
    }
}

arduino.configure(9600, 8, PARITY_NONE, 1, NO_CTSRTS, arduinoData);


function blink(state) {
    server.log("Setting LED to: " + state);
    arduino.write(state);
    imp.wakeup(1.0, function() { blink(1-state); });
} blink(1);

ElectricImpSerial.cc

// arduino device code
int led = 13;            // led pin number

void setup() {
  Serial.begin(9600);    // configure serial
  pinMode(led, OUTPUT);  // configure LED pin
  digitalWrite(led, 0);  // turn LED off
}

void loop() {
  int b = 0;
  // if there's data available
  if (Serial.available () > 0) {
    // read a byte
    b = Serial.read();
    if (b == 0x00) {
      digitalWrite(led, LOW);
      Serial.write(0x10);
    } else if (b == 0x01) {
      digitalWrite(led, HIGH);
      Serial.write(0x11);
    }
  }
}