A simple express webserver that simulates a sensor value

fake_tag.js

const express = require('express')
const app = express()
const port = 8081

var pressure = 25;

function noise() {
	let max = 10;
	let min = -10;
	let factor = Math.random();
	let range = max - min;
	let gain = (factor * range) + min;
	pressure += gain; 
	if (pressure < 0) {
		pressure = 0;
	}
}

setInterval(noise, 1000);

app.get('/', (req, res) => {
  res.send(`init ${pressure} end`)
})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})