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dht12.js
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dht12.js
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/* Copyright (C) 2019 [email protected]
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
var i2c = require('i2c');
var address = 0x5c;
var wire = new i2c(address, {device: '/dev/i2c-2'}); // point to your i2c address
setInterval(getHumidityTemp,50);
function getHumidityTemp(){
wire.readBytes(0x00, 5, function(err, res) {
if(res[0]+res[1]+res[2]+res[3] != res[4]){ //checksum in 5th byte
printError(err);
}else{
var Hum = res[0] + 0.01*res[1];
var T_celcius = res[2] + 0.01*res[3];
var T_farenheit = celc2far(T_celcius);
console.log(T_celcius.toFixed(2)+ ' '+T_farenheit+' '+Hum.toFixed(2));
}
});
}
function printError(err){
console.err(err);
}
function celc2far(tc){
t_far = 1.8*tc+32;
return t_far.toFixed(2);
}