cs   <- hardware.pin8;
miso <- hardware.pin7;
mosi <- hardware.pin5; //self test probably
sck  <- hardware.pin2;

// configure pin
cs.configure(ANALOG_IN);
miso.configure(ANALOG_IN);
mosi.configure(ANALOG_IN);
sck.configure(ANALOG_IN);

led.configure(DIGITAL_OUT);
led2.configure(DIGITAL_OUT);
 
local x = 0;
local y = 0;
local z = 0;
local xo = 0;
local yo = 0;
local zo = 0;
local t = 80;
local counter = 0;
local smssent = 0;
local stepLimit = 20;

function poll() {
    // read pin and log
    x = cs.read();
    y = miso.read();
    z = sck.read();
    if ((math.abs(x - xo) > 900) || (math.abs(y - yo) > 900) || (math.abs(z - zo) > 900)) {
        counter++;
    }

    if (counter == stepLimit && (smssent == 0)) {
        smssent = 1;
        agent.send("sms", "food truck outside, $1 hotdogs for the next 20 minutes");
    }

    //reset acceleometer data
    xo = x;
    yo = y;
    zo = z;
    
    // wake up in 0.1 seconds and do it again
    imp.wakeup(1, poll);
}
 
// start the loop
poll();