Friday, February 4, 2011

Busy weekend coming up

The good news is that I didn't have to bring home any work to get through this weekend so that should leave me with a decent amount of time to hack the IM-ME.  Before getting into that, here is a little tidbit that has pretty much nothing to do with the hacking of the console.  Compare this:
Console Temperature & Humidity Sensor
with this:

Sensirion SHT 11

I'd say we have a match. AJP & A5Z are just lot codes according to the datasheet.  Follow this link to find the details of the Sensirion SHT11 sensor used in the console, and this link to the datasheet.  I have a sneaking suspicion that the ISS uses the same sensor, but I'm not about to tear it apart to find out.  It would make sense though.  The measly -40C bottom end of the outdoor unit matches the lower limit of this chip.  Grrxyn left a comment on an earlier post noting that the Davis design doesn't follow the datasheets recommendation of thermally isolating the sensor from the main circuit board.  So if your console seems to be reading a bit hot, now you know why.


  1. Dont you love being right?
    Temperature Humidity Sensor Spec Sheet
    Right above the pinout of the cable it says:
    Note: This sensor uses a proprietary signal format and will work only with Davis weather stations. We do not support the use of this sensor in 3rd party

    I'm sure you are right about that chip also being in the outdoor unit.

  2. I now know I'm right about that chip being used in the outdoor unit. From this link, get the "Internal Pictures" document. See anything familiar at the top of Page 6?