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--- projects:xiaomi-flora [2016/10/31 21:45] – emeryth
+++ projects:xiaomi-flora [2016/11/02 20:25] – [Historical data] emeryth
@@ Line 1: / Line 1: @@
-====== Xiaomi Flora Flower Monitor teardown and analysis ======
+====== Xiaomi Flora Plant Monitor teardown and analysis ======
 by [[people:emeryth:start|emeryth]] (emeryth at hackerspace.pl)
 This is a teardown and analysis of the Xiaomi flower/plant monitor (it doesn't seem to have an official name).
-It is not extremely in-depth because the main goal was to figure out how to use the device without the official app.
+The analysis is not extremely in-depth because the main goal was to figure out how to use the device without the official app.
 **Note:** While writing this down, I have found out that I am not the first to publish something about the device ( https://community.home-assistant.io/t/xiaomi-mi-plants-monitor-flower/3388 ) but everything here is my independent work.
@@ Line 29: / Line 29: @@
 {{:projects:flora_back.jpg?direct&300|}}
+==== Pin header ====
+|2 ???|4 SW_CLK|5 SWDIO|8 GND|
+|1 VBATT|3 ???|6 ???|7 GND|
 ==== Chips on the PCB ====
@@ Line 62: / Line 66: @@
 **0x0033** - You need to write **0xA01F** to this handle to enable real-time data reading
-**0x0035** - The actual data from the sensors, can be rad only after you enable real-time data, otherwise returns zeros
+**0x0035** - The actual data from the sensors, can be read only after you enable real-time data, otherwise returns zeros
 Example data frame, values are little-endian
@@ Line 70: / Line 74: @@
 Notes:
-  * Temperature is signed 16-bit value in tenths of degrees C, so 265 means 25.5 °C
+  * Temperature is signed 16-bit value in tenths of degrees C, so 265 means 26.5 °C
   * Light intensity in lux, not sure if 32-bit
   * Moisture in percent
   * Fertility in µS/cm
+**0x0036** - writing **0x0100** to this handle will subscribe you to sensor value notifications
 Here is a short Python script to get all the interesting data from the device:
@@ Line 100: / Line 107: @@
 print "Soil fertility:",fertility,"uS/cm"
 </code>
+==== Historical data ====
+The device stores historical data when not connected that can be later synchronized.
+I have not figured it out yet, but looking at the dumps it seems to work by writing an address to handle 0x003e and the reading data from handle 0x003c.
+===== Firmware hacking =====
+I have no interest in changing the firmware, since you can already get all data you need from the original firmware.
+But if you really want to know, the device supports OTA firmware update and there is a header with SWD on the PCB, although I was unable to connect to the cpu using OpenOCD.