Welcome to the family Xiaomi Air Purifier H3!
If something enters my house I open it as quickly as possible and start probing around.
The following information is for educational Purposes only!
Note, I absolutely love Xiaomi stuff since it is cheap, of decent build quality, and it’s fun to probe around in!
How to disassemble the device:
The device itself is quite easy to disassemble. One of the first things that is noticeable is that a bare minimum of screws that are used. The bottom side has four, and underneath the bottom plate has another four screwed in. Almost the complete assembly is made to click-clack-badabing-badaboom and your done (my way of putting things together). Seldom I see products this well constructed with mass production in mind. The engineers at Xioami absolutely did a great job! For every product engineer on this planet: buy this device, take it apart, and learn from it!
When opening the device we find the following main board:
AC-M6-B01
REV3-BDR
Connector _pins: |
Function |
J1 |
ESP_PROG_HEADER |
-1 |
3V3 |
-2 |
GND |
-3 |
ESP-32-UART0-TX |
-4 |
ESP-32-UART0-RX |
J2 |
STM_SERIAL_DEBUG |
-1 |
STM32-RX |
-2 |
STM32-TX |
-3 |
GND |
-4 |
3V3 |
J3 |
ESP_GPIO_0_HEADER |
-1 |
ESP-32-GPIO-0 |
-2 |
GND |
J4 |
MOTOR_CONNECTOR |
-1 |
24V |
-2 |
GND |
-3 |
5V |
-4 |
PWM |
-5 |
BRK? |
-6 |
? |
-7 |
FG? |
J7 |
PLANT_POWER_CONNECTOR |
-1 |
? |
-2 |
? |
-3 |
? |
-4 |
RX |
-5 |
TX |
-6 |
SET |
-7 |
GND |
-8 |
5V |
J8 |
POWER_CONNECTOR |
-1 |
24V |
-2 |
GND |
J9 |
STM_PROGRAMMING_HEADER |
-1 |
3V3 |
-2 |
GND |
-3 |
SWDIO |
-4 |
CLK |
-5 |
SWO |
-6 |
NC? |
J10 |
NFC_HEADER |
-1 |
SDA |
-2 |
3V3 |
-3 |
STATE |
-4 |
GND |
-5 |
SCL |
J11 |
SHT_20+BUTTON_HEADER |
-1 |
SCL |
-2 |
GND |
-3 |
LED_ON |
-4 |
3V3 |
-5 |
SDA |
-6 |
? (button?) |
J12 |
DOOR_SWITCH |
-1 |
BOT_DOOR |
-2 |
GND |
J6 is the header that is used for the OLED display. I could not be bothered to probe it as I’m not trying to hack the display.
IC’s used:
| Designator | IC |
| U3 | Fremont FT24C64A |
| U4 | Espressif ESP-WROOM-32D |
| U5 | ST STM32F412RET6 |
U3 = an 64K EEPROM datasheet: Click
U4 = an Espressif wifi adapter. This IC/ Package handles all the WIFI/BLE Traffic.
U5= The main Microcontroller.
This is a good start for reverse engineering. No mysterious Chinese crap IC’s. In the following parts of this series of blog posts we will look into the contents of these chips 😀
More info on this project will be added on the project’s GitHub
Is it possible to hack the filter lifespan? It is great feature but it doesn’t work perfect. It decreases by hours, not by dust or pollution. So if you run it in perfect space or in very polluted space it will give same lifespan and will ask to change then.
There is a solution 😉 = https://www.tindie.com/products/theflamingo/xiaomi-air-purifier-3hcpro-mod-no-nfc-mod/ no more depleting filters!
Hi! I have a Purifier 3H. It makes noise since the first day. It seems to be the rotor/motor. What could be the cause/solution?
Hey Mattia,
I dont know. If the machine is still in warranty I would just send it back.
Thank you very much for the reply! Unfortunately, it has expired…
how to turn off wifi? where is antenna?
> The device itself is quite easy to disassemble
I disagree, the side panels are a pain to disassemble. It’s easy to open the clips in the bottom part with a screwdriver, but you can’t do that for the top ones. Maybe I’m not very smart, but I’ve been trying to open them for the last 20 minutes without success.
Yes, it’s a pain.
With a screwdriver or so you can unlock the plastic ‘locks’ one by one without damage. Just don’t use another ‘lock’ as lever 😉
Currently I’m stuck at the last part at the top. There is a youtube video (_rC2a6l0M2k) and this guy has a hard time at this point too (starting from around 7:00).
Filter se varaca na 100 % stalno
Kako to da rijesim 4 pro model..