TP9605 Datalogger

index.js

const btSerial = new (require('bluetooth-serial-port')).BluetoothSerialPort();
const readline = require('readline');
const chalk = require('chalk');

let start = new Date();
let data = [['time', 'temp']];
let go = false;
function log(...data){
	if(go) console.log(chalk.green(...data));
	else console.log(chalk.yellow(...data));
}

const rl = readline.createInterface({
	input: process.stdin,
	output: process.stdout,
});
rl.on('line', () => {
	if (go) {
		go = false;
		console.log(chalk.blue.bold(data.map(d => d.join(',')).join('\n')));
		return;
	}
	data = [['time', 'temp']];
	start = new Date();
	go = true;
});

btSerial.on('found', function (address, name) {
	console.log(address, name);
	if (name !== 'TP9605') return;
	btSerial.findSerialPortChannel(address, function (channel) {
		btSerial.connect(address, channel, function () {
			console.log('connected');

			btSerial.write(new Buffer('my data', 'utf-8'), function (err, bytesWritten) {
				if (err) console.log(err);
			});
			let buf = '';
			btSerial.on('data', function (buffer) {
				buf += buffer.toString('utf-8');
				const plus = buf.indexOf('+') === -1 ? Infinity : buf.indexOf('+');
				const minus = buf.indexOf('-') === -1 ? Infinity : buf.indexOf('-');
				if (Math.min(plus, minus) !== Infinity) {
					buf = buf.substring(Math.min(plus, minus));
					if (buf.length >= 7 && buf.indexOf('\n') !== -1) {
						if (buf.charAt(5) === ' ' && !Number.isNaN(parseInt(buf.charAt(6)))) {
							let num = parseInt(buf);
							const power = parseInt(buf.charAt(6));
							num = num * Math.pow(10, (3 - power) * 3 - 1);
							num = num.toFixed(1);
							if(go) data.push([(new Date() - start) / 1000, num]);
							log(num);
						}
						buf = buf.substring(buf.indexOf('\n'));
					}
				}

			});
		}, function () {
			console.log('cannot connect');
		});

		// close the connection when you're ready
		btSerial.close();
	}, function () {
		console.log('found nothing');
	});
});

btSerial.inquire();

package.json

{
  "name": "multimeter",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "bluetooth-serial-port": "^2.1.7",
    "chalk": "^2.4.2"
  }
}

yarn.lock

# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
# yarn lockfile v1


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