Xiaomi mi flora & ESP32

This arduino sketch implements an ESP32 BLE client for multiple XIaomi Mi Flora Plant sensors, pushing the measurements to an MQTT server.

Technical requirements

Hardware:

• ESP32
• Xiaomi Mi Plant Sensor (firmware revision >= 2.6.6)

Software:

• MQTT server

Setup instructions

1. Edit config.h and update setings according to your environment:

• WLAN SSID and password
• MQTT Server address, username, password and topic
• MAC addresses of your Xiaomi Mi Plant sensors

2. Open ino sketch in Arduino, compile & upload.

Measuring interval

The ESP32 will perform a single connection attempt to the Xiaomi Mi Plant sensors, read the sensor data & push it to the MQTT server. The ESP32 will enter deep sleep mode after 30 seconds (can be configured in config.h) and sleep for one hour (also configurable in config.h), before repeating the exercise... Battery level is read every 12th wakeup (configurable via config.h).

Sketch size issues

The sketch does not fit into the default arduino parition size of around 1.3MB. You'll need to change your default parition table and increase maximum build size to at least 1.6MB.

Credits

Sven Henkel is the original author of the sketch

Many thanks go to the guys at https://github.com/open-homeautomation/miflora for figuring out the sensor protocol.