I received an email from Pekka (Thanks!) who found out about this problem in a video/comment. Two distinct signs: Slow to respond to particle changes. Display only shows 001 Cause: The sensor used in the Xiaomi Air Purifiers is the: PMS9003M by Plantpower Datasheet: This sensor uses a pin named SET. The function of that… Continue reading Xiaomi Air Purifier 001 PPM FIX!
As stated in the first post, the main PCBA contains a Fremont EEPROM. I used one of many Chinese flash tools (mine is a SP8-F made by fly-pro…) ROM dump: The first thing I do with a ROM dump is to analyze the data using a website called : http://binvis.io I then upload my binary… Continue reading Xiaomi Air Purifier 3H Reverse Engineering Part 2: Fremont EEPROM dump
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… Continue reading Xiaomi Air Purifier 3H Reverse Engineering Part 1: Probing Around