home.social

#smbus — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #smbus, aggregated by home.social.

  1. Trying to figure out how my #ThinkPad Edge #E531 does the detection that it has a "genuine" battery.

    Of course it has to be implemented inside the EC firmware.

    It is an ENE KB9012. I have the datasheet as well as a dump of its firmware and the schematics for the laptop. But I cannot find where it writes to or reads from the right #SMBus registers.

    Does anyone know where I can get in contact with the right people in this domain?

    #reverseengineering #followerpower #firmware #hacking #8051

  2. As the server PSUs feature #SMBus connectivity, we planned to display some metadata on an OLED.

    I soldered up a small perfboard with a buck converter, #ESP32 and a few connectors.

    The ESP32 only communicates with the low-side PSU, as I didn't want to implement isolated I²C.
    But I noticed that the values coming from the PSU were pretty hit & miss anyways. Especially during light loads.
    So I simply used the values that matched the actual values closest and doubled them.

    #PDBrick

  3. Building An Open Source ThinkPad Battery - If you own a laptop that’s got a few years on the clock, you’ve probably contemplated getting a repl... - hackaday.com/2020/09/02/buildi #laptopshacks #attinyhacks #batterypack #thinkpad #smbus #t420