As the first project of this chapter, we are simply going to check that each individual component (the sensor and the PowerSwitch tail) are working correctly.
I will now go through the main parts of this first piece of code. It starts by including the DHT sensor module for Node.js:
var sensorLib = require('node-dht-sensor');Then, we create an object to read data from the sensor, and also initialize it when we start the software:
var sensor = {
initialize: function () {
return sensorLib.initialize(11, 4);
},
read: function () {
var readout = sensorLib.read();
console.log('Temperature: ' + readout.temperature.toFixed(2) + 'C, ' +
'humidity: ' + readout.humidity.toFixed(2) + '%');
setTimeout(function () {
sensor.read();
}, 2000);
}
};
if (sensor.initialize()) {
sensor.read();
} else {
console.warn('Failed to initialize sensor');
}You can now either copy the code inside a file...