Quick Electric Imp impExplorer Tilt Meter

agent.nut

function motion(direction) {
    server.log(direction);
}


device.on("direction.sent", motion);

device.net

// Accelerometer Library
#require "LIS3DH.class.nut:1.3.0"
#require "WS2812.class.nut:2.0.2"

// Define constants
const sleepTime = 10;
const LIS3DH_ADDR = 0x32;

// Accel settings
const ACCEL_DATARATE = 100;

// High Sensitivity set, so we alway wake on a door event
const ACCEL_THRESHOLD = 0.1;
const ACCEL_DURATION = 1;

// Declare Global Variables
accel <- null;
led <- null

// Define functions
function takeReading(){
    accel.getAccel(function(reading) {
        if( reading.y < -0.50) {
            agent.send("direction.sent", "RIGHT"); 
            flashLed([0,0,128]);  
        }
        
        if( reading.x < -0.50) {
            agent.send("direction.sent", "BACK"); 
            flashLed([0,128,0]);  
        }
        
        if( reading.y > 0.50) {
            agent.send("direction.sent", "LEFT"); 
            flashLed([128,0,0]);  
        }
        
        if( reading.x > 0.50) {
            agent.send("direction.sent", "FORWARD"); 
            flashLed([0,128,128]);  
        }
        
        takeReading();
    });
}

function flashLed(color) {
    led.set(0, color).draw();
    imp.sleep(0.5);
    led.set(0, [0,0,0]).draw();
}

// Start of program

// Configure I2C bus for sensors
local i2c = hardware.i2c89;
i2c.configure(CLOCK_SPEED_400_KHZ);

accel = LIS3DH(i2c, LIS3DH_ADDR);
accel.init();
// set up to take readings
accel.setLowPower(true);
accel.setDataRate(ACCEL_DATARATE);
accel.enable(true);

// Configure SPI bus and powergate pin for RGB LED
local spi = hardware.spi257;
spi.configure(MSB_FIRST, 7500);
hardware.pin1.configure(DIGITAL_OUT, 1);
led <- WS2812(spi, 1);

// Take a reading
takeReading();