Monatsrückblick Januar/Februar 2026 ist online!

[erwinberlin]

Hi, I am having trouble reading a data point from a JSON message in blockly. The script works, however there is 1 datapoint with a . in it. Is there a trick to get it done? I tried various solutions I found online, however to no avail. See the JSON message below.

{"Time":"2021-03-28T11:31:08","BMP180":{"Temperature":11.4,"Pressure":1022.7},"SHT3X-0x45":{"Temperature":11.2,"Humidity":45.3,"DewPoint":-0.3},"SDS0X1":{"PM2.5":3.6,"PM10":7.0},"PressureUnit":"hPa","TempUnit":"C"}

[paul53]

@erwinberlin

obj.SDS0X1['PM2.5']

Blockly:

[erwinberlin]

This is my code, however the PM2.5 still does not work in this script. I used the code in blockly and that works fine! Now I can see the differences, but I still would like to understand why the script does not work?

Probably obvious to experienced Java programmers, however not for a newbie like me. Any help appreciated!

var AQ;
on({id: "mqtt.0.tele.tasmota_sensors_7E466A.SENSOR", change: "any"}, async function (obj) {
  var value = obj.state.val;
  var oldValue = obj.oldState.val;
  AQ = (function () { try {return JSON.parse(getState("mqtt.0.tele.tasmota_sensors_7E466A.SENSOR").val);} catch(e) {return {};}})();
  console.log('PM10 & PM2.5');
  console.log(parseFloat(getAttr(AQ, 'SDS0X1.PM10')));
  console.log(parseFloat(getAttr(AQ, 'SDS0X1['PM2.5']')));
  if (parseFloat(getAttr(AQ, 'SDS0X1.PM10')) != 0) {
    setState("javascript.0.Air-quality.10um", parseFloat(getAttr(AQ, 'SDS0X1.PM10')), true);
  }
  if (parseFloat(getAttr (AQ, 'SDS0X1['PM2.5']') != 0) {
    setState("javascript.0.Air-quality.2_5um", parseFloat(getAttr(AQ, 'SDS0X1['PM2.5']')), true);
  }
});

[paul53]

@erwinberlin sagte): 'SDS0X1['PM2.5']'

Try this:

PM10 and PM2.5 values are numbers.

let x = getAttr(json, 'SDS0X1['PM2.5']'); // designed for Blockly
// is not
let x = JSON.parse(json).SDS0X1['PM2.5']; // Javascript

because the 2. parameter of getAttr() must be a string or an array with one string element.

P.S. Spricht ErwinBerlin kein deutsch?

[paul53]

@erwinberlin
Javascript-Version:

on('mqtt.0.tele.tasmota_sensors_7E466A.SENSOR', function (dp) {
  let sensor = JSON.parse(dp.state.val);
  let pm10 = sensor.SDS0X1.PM10;
  let pm2_5 = sensor.SDS0X1['PM2.5'];
  log('PM10: ' + pm10);
  log('PM2.5: ' + pm2_5);
  if (pm10) setState("javascript.0.Air-quality.10um", pm10, true);
  if (pm2_5) setState("javascript.0.Air-quality.2_5um", pm2_5, true);
});

[erwinberlin]

@paul53 Super, vielen Dank! Das hat mich sehr geholfen.

Übrigens spreche ich Deutsch, aber schreiben ist jedoch etwas ganz anderes...