Basic imp <--> Arduino code example

ArduinoUART.device.nut

server.log("Device Started");

function arduinoData() 
{
    // Read the UART for data sent by Arduino to indicate
    // the state of its LED.
    
    local b = arduino.read();
    while(b != -1) 
    {
        // As long as UART read value is not -1, we're getting data
        
        local state = "Unknown";
        if (b == 0x10) state = "Off";
        if (b == 0x11) state = "On"
        server.log("LED: " + state);
        b = arduino.read();
    }
}

function blink(state)
{
    // Write state (1 or 0) to the Arduino
    
    server.log("Setting LED to: " + state);
    arduino.write(state);
    imp.wakeup(1.0, function(){blink(1 - state);});
}

// Alias UART to which Arduino is connected

arduino <- hardware.uart57;
arduino.configure(9600, 8, PARITY_NONE, 1, NO_CTSRTS, arduinoData);

// Start blinking

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);
        }
    }
}