I have taken my cheap 24mhz logic analyzer out of the box. It was first time after 3 years from buying that thing. I realized that it can do amazing things! After two deep evenings of researching of optical mouse sensor without reasonable protocol description from datasheet I got some results.

Weird thing at the top is a logic analyzer (with MINI USB input shit! I've got lucky having one)

Setup of hackeeng e moose. Logic analizer without a case because I hate male-female jumper wires for their unreliability. Soldering is our everything.

Some batch of bits running to&from mcu and sensor while sensor is connected to native Mrs. Mouse mcu. Yes, it's called "sniffing" in our world.

Software used is Saleae Logic. It's a good looking and responsive tool for sniffing and decoding low-level protocols. Here I have two-wire serial communication with 8-bit packets going in and out. First 8 bits going from mcu is an register's address. Second 8 bits is an answer from sensor.

This record contains 3 packets, first - for product id 1 (address 0x00), second - for product id 2 (address 0x01) and third (address 0x02) is a state (moving or not).

As a patient we have Oklick 645MW mouse with 2.4 ghz radio dongle. Price ~4$. I've bought it in our local Russian retailer. Sensor's chip has engraved number which is 3065.

After writing some lines of Arduino code I've transformed 2.4Mhz dongle mouse to working bluetooth monster! (without clicks, just for fun now 👌)

Let's check that comments are open.

Waiting for mine 🐬

https://blog.flipperzero.one/quick-start-guide-and-shipping-update/

Just got DPI setting working. Only three levels found by randomly getting and setting bits (I think there are special bits for other parameters, but I don't have documentation 😕)

First prototype in early stage wip...

But for now eating a birthday cake 🎂