Proof of concept. May leak memory, crash, etc.
Uses ArduinoJSON, NimBLE-Arduino, ESP-NOW
Listens for BLE advertisements from any GOVEE 5074 sensor
- extracts temperature and humidity from BLE advertisement
- creates JSON doc
- forwards doc to ESP-NOW broadcast address
Sample ESP-NOW packet:
{
"D":"ESP-GOVEE",
"Govee_H5074_DB3A/tempInC":18.87999916,
"Govee_H5074_DB3A/humidity":51.66999817,
"Govee_H5074_DB3A/battery":97
}
The companion app to this: https://github.com/mkjanke/ESP32-Now-JSON-GW. This gateway app receives ESP-NOW broadcasts and forwards them to an attached serial port.
Notes on passively monitoring Govee BLE 5074 temperature sensor using and ESP32
Reference: https://github.com/Thrilleratplay/GoveeWatcher
Byte: 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
-----------------------------------------------------------------------------------------------------------
Data: 02 01 06 03 03 88 ec 11 09 47 6f 76 65 65 5f 48 35 30 37 34 5f 46 37 31 41 0a ff 88 ec 00 58 0a e6 11 64 02
Data: 02 01 06 03 03 88 ec 11 09 47 6f 76 65 65 5f 48 35 30 37 34 5f 46 37 31 41 0a ff 88 ec 00 b7 09 a0 12 64 02
----- ----------------------------------------------- ----- ----- ----- --
Mfg Id G o v e e _ H 5 0 7 4 _ F 7 1 A Mfg Id TempC Humid Bat
88 ec 00 f8 09 cf 11 64 02
----- ----- ----- --
Mfg Id TempC Humid Bat
88ec00580ae6116402
Temperature (C): 580a
- Convert to int:
data[3] << 0) | (data[4]) << 8 = 2648 - Divide by 100 = 26.48 deg. C
Humidity: e611
- Convert to int:
data[5] << 0) | (data[6]) << 8 = 4582 - Divide by 100 = 45.82 %
Battery Pct: 64 = 64 hex = 100%