How to send data as a string from NodeJs runtime to Arduino board using Serial communication?

Question

I am working in a project that requires serial communication between Arduino board and NodeJs runtime in Raspberry Pi.

I want to send a string like "255,100,100,255" from NodeJs program inside my Pi to Arduino board to control the brightness of 4 lights. 4 elements inside the string are the brightness of each light.

How to code in both NodeJs and Arduino program so that Arduino board receive all the string?

Answer 1

You can use the module serialport.

First install it using

npm i serialport

Then in your NodeJS code you can create a sender:

let serial = require("serialport").SerialPort;
let sp = new serial("/dev/ttyACM0", { baudrate: 9600 });
sp.on("open", function(){
    sp.write("255,100,100,255", function(err, res) {
        if (err) return console.log(err);
    });
});

While on your arduino you can make a receiver:

int incomingByte = 0;
void setup(){ Serial.begin(9600); }
void loop(){
    if (Serial.available() > 0) {
        incomingByte = Serial.read();
        Serial.println(incomingByte);
    }
}