johnny-five/eg/sensor-temperature-tmp36.js

The JavaScript Arduino Programming Framework.

var five = require("../lib/johnny-five.js"),
  board, sensor;

board = new five.Board();

board.on("ready", function() {
  // This example is for the TMP36 analog temperature sensor
  sensor = new five.Sensor("A0");

  function analogToCelsius(analogValue) {
    // For the TMP36 sensor specifically
    return ((analogValue * 0.004882814) - 0.5) * 100;
  }

  function analogToFahrenheit(analogValue) {
    return analogToCelsius(analogValue) * (9 / 5) + 32;
  }

  sensor.on("data", function() {
    var celsiusValue, fahrenheitValue;
    // Obtain temperature from current analog value
    celsiusValue = analogToCelsius(this.value);
    fahrenheitValue = analogToFahrenheit(this.value);
    console.log(celsiusValue + "°C", fahrenheitValue + "°F");
  });
});

// @markdown
// - [TMP36 - Temperature Sensor](https://www.sparkfun.com/products/10988)
// @markdown