##Lab: Serial Communication with Node
Modified to take in value from single sensor:
//ARDUINO SKETCH
void setup() {
Serial.begin(9600);
Serial.print("0");
}
void loop() {
if (Serial.available() > 0) {
char input = Serial.read();
int sensor = analogRead(A0);
Serial.println(sensor);
};
}
//INDEX.JS file
var serialport = require('serialport'),
SerialPort = serialport.SerialPort,
portname = process.argv[2];
//setup port
var myPort = new SerialPort(portname, {
baudRate: 9600,
options: false,
parser: serialport.parsers.readline("\n")
});
myPort.on('open', function(){
console.log('port is open');
});
myPort.on('close', function(){
console.log('port is closed');
});
myPort.on('error', function(){
console.log('there is an error');
});
myPort.on('data', function(data){
console.log(data);
myPort.write('x');
});I get a “port is open” but no values, I checked my connections and receive serial data in the Arduino IDE port (first a “0” and then when I send it a value). But in the console, node doesn’t work.
$ node index.js /dev/cu.usbmodem621
port is open####Conclusion
Despite the failure, I feel better acquainted with node’s functioning especially its use of callback functions and use of JSON name pair values to configure the serial port.