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06_pollActiveZ.js
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06_pollActiveZ.js
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// Read the OUT_Z_MSB register of to accel-mma84 after waking it up
// Pins: SDA, SCL
// Tell Tessel what pins to use
var tessel = require('tessel');
var port = tessel.port.A;
// In I2C, each hardware component
// has a specific "address"
var I2CAddress = 0x1D;
// Set up communication pathway
var i2c = new port.I2C(I2CAddress);
// Wake up the accelerometer
var setActive = function (nextFunction) {
var CTRL_REG1 = 0x2A;
i2c.send(new Buffer([CTRL_REG1, 0b00000001]), function () {
nextFunction();
});
};
// Define what to read
var registerAddressToRead = 0x05; // OUT_Z
var bytesToRead = 1; // Just the register we need
setActive(function poll () {
// Every 1 second...
setInterval(function getZAxis () {
// Read register
i2c.transfer(new Buffer([registerAddressToRead]), bytesToRead, function (error, dataReceived) {
if (error) {
console.log(error);
}
console.log(dataReceived);
});
}, 1000);
});