Xiaomi sensors/appliances

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•

Gordon

Which device are you wanting to run this on?

There's actually a Bangle.js app for this already at: https://github.com/espruino/BangleApps/blob/master/apps/miplant/app.js

So to run on another device you could just copy var deviceInfo = {};, parseDevice and the NRF.setScan command, then check in deviceInfo after a few seconds and see if you get any data.

The code posted above (using findDevices) isn't ideal as it doesn't catch every advertising packet. To get all the information you need you have to have it scanning for advertising packets for a while

•

Andrea in reply to @Gordon

Hi @Gordon, I uploaded this code to Pixl.js (2v08)

var deviceInfo = {};

function parseDevice(device) {
  var d = new DataView(device.serviceData["fe95"]);
  var frame = d.getUint16(0, true);
  var offset = 5;

  console.log("FRAME: " + frame);

  if (frame&16) offset+=6; // mac address
  if (frame&32) offset+=1; // capabilitities
  if (frame&64) { // event
    var l = d.getUint8(offset+2);
    var code = d.getUint16(offset,true);
    if (!deviceInfo[device.id]) deviceInfo[device.id]={id:device.id};
    event = deviceInfo[device.id];
    switch (code) {
      case 0x1004: event.temperature = d.getInt16(offset+3,true)/10; break;
      case 0x1006: event.humidity = d.getInt16(offset+3)/10; break;
      case 0x100D:
        event.temperature = d.getInt16(offset+3,true)/10;
        event.humidity = d.getInt16(offset+5)/10; break;
      case 0x1008: event.moisture = d.getUint8(offset+3); break;
      case 0x1009: event.fertility = d.getUint16(offset+3,true)/10; break;
      // case 0x1007: break; // 3 bytes? got 84,0,0 or 68,0,0
      default: event.code = code;
        event.raw = new Uint8Array(d.buffer, offset+3, l);
        break;
    }
    print(event);
  }

};

setInterval(function () {
    NRF.setScan(parseDevice, { filters: [{serviceData:{"fe95":{}}}], timeout: 2000 });
}, 5000);

It always prints FRAME, and when the temperature or humidity changes it prints the event:

FRAME: 22616
{
  "id": "a5:c2:83:xx:xx:xx public",
  "code": 50578,
  "raw": new Uint8Array([208, 117, 0, 0, 58, 221, 132, 170, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
 }

FRAME: 22616
{
  "id": "a5:c2:83:xx:xx:xx public",
  "code": 15670,
  "raw": new Uint8Array([121, 182, 117, 0, 0, 185, 254, 166, 227, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
 }

I have no idea how to extract the temperature and humidity :-)

Can I get some useful info from this Python code (0x80, 0x7F)?

https://github.com/adafruit/Adafruit_CircuitPython_BLE_LYWSD03MMC/blob/main/adafruit_ble_lywsd03mmc.py

THANK YOU

Xiaomi sensors/appliances

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