ESP8266 - NodeMCU - led and ds1820 temperature example

[espruino-discuss2]

Posted at 2016-02-27 by Wilberforce

Here is an example using a Node MCU board. The firmware used is:

1v85 Copyright 2016 G.Williams

I have 2 DS18s20 connected to pin D1 (with the pullup resistor), and led connected via a 330Ohm resistor connected to pin D2.

The led is flashed ever 5 seconds, and the temperatures of each of the sensors echoed.
The [Flash] button on the board is watched, and this also toggles the state of the LED.

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 1v85 Copyright 2016 G.Williams
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WARNING: the esp8266 port is in beta!
Flash map 4MB:512/512, manuf 0xe0 chip 0x4016
>echo(0);
=undefined
0: 85
1: 85
0: 26.75
1: 26.25
0: 26.8125
1: 26.3125
0: 26.8125
1: 26.3125
button
0: 26.875
1: 26.375
0: 26.9375
1: 26.4375
> 

var led = Pin(NodeMCU.D2);
var toggle=1;
var ow = new OneWire(NodeMCU.D1);

var sensors = ow.search().map(function (device) {
  return require("DS18B20").connect(ow, device);
});

function updateLed(){
  digitalWrite(led, toggle);
  toggle=!toggle;
}

setInterval(function() {
  updateLed();

   sensors.forEach(function (sensor, index) {
    console.log(index + ": " + sensor.getTemp());
  });
},5000);

function button_down() {
  updateLed();
  print('button');
}


setWatch(button_down,NodeMCU.D3, {repeat:true, edge:"falling"});

I hope someone finds this useful!