ludwich66 / bluetooth-dmm Goto Github PK

Thank alot to you who made this shares and helps you. it was very helpful for me...
so i made an UWP application for aneng 9002 maybe some one need it
Bluetooth DMM for Windows
https://github.com/webspiderteam/Bluetooth-DMM-For-Windows
if you wish you can add this too

i don't have a multimeter to test it, but i made a port to python based on the 11 bits protocol from the wiki:
https://github.com/Shiro-Nek0/Bluetooth-DMM.py

I made a web-based implementation to announce the readings and generate buzz tone. It only works for Big-DMM type, at the moment.

• Github repo
• Live page

Not sure where to leave this but the ESP32 implementation of protocol decoder may be helpful for those trying to connect.
https://m5.8266.de/?msel=stip_bt_dmm
I could not find this resource in the WIKI

I've managed to decode the BT protocol for my aneng AN9002. The key to decoding the protocol is literally a xor key. I've recovered parts of it experimentally, the full key can be recovered from the android app apk, here it is: "\x41\x21\x73\x55\xa2\xc1\x32\x71\x66\xaa\x3b\xd0\xe2\xa8\x33\x14\x20\x21\xaa\xbb". Only bytes 0-10 will be used.

After XOR-ing the 11-byte notification value with the key, each of the resulting bits encodes one segment of the LCD.

My proof-of-concept decoder for AN9002 is here. The decoder doesn't produce sensible results from the data from "Parts-of-11-Byte-Protocol" though. Maybe that data is from a different model that has a different LCD segment mapping?

In wiki page (https://github.com/ludwich66/Bluetooth-DMM/wiki/Protocol-all-Variants), Diode: 56 is missing for Big-DMM type. Please add it.

The BT device is called BK3432
If you use a digital analyzer, or just connect FTDI (USB-UART) to the RX/TX pins, - there are only 6 or so that go to/from the DMM chip, you should easily be able to log any commands and responses the original software does to make it start transmitting data.