screaming in digital

fixate on what you think you know… you’re missing what you don’t though.

  • 8 Posts
  • 542 Comments
Joined 4 years ago
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Cake day: May 7th, 2023

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  • this has got to be a troll post. right? RIGHT?!

    as you pointed out, just get rid of the air gaps with the absolute minimal amount of paste.

    my back woods method

    ensure your heat sink does not have pre-applied paste or a pad. apply a small amount of paste. cut the thickness with the short edge of an old credit card at about a 30° angle, using just enough pressure to bend the card slightly so the smooth surface of the card presses paste into voids and the trailing edge of the card removes excess to level the surface - you will likely still be able to make out some chip package markings through the paste. remove all edge excess and spillage. fit your heat sink. done.










  • So poking around, here is what I have been thinking about.

    Multi-sensor - cabled

    • Adafruit Feather RP2040 Adalogger (RP2040, STEMMA QT, microSD, LiPo connector, USB-C)
    • Adafruit PCA9546 4-Channel STEMMA QT I2C Multiplexer (4 downstream STEMMA QT ports)
    • Adafruit SHT40 Temp/Humidity Breakout (STEMMA QT, ±0.2°C / ±1.8% RH)

    Single sensor - direct attached

    • Adafruit SHT45 Trinkey (USB Temp and Humidity Sensor with PTFE)

    or

    • Adafruit SHT41 Trinkey (USB Temperature and Humidity Sensor)

    available libraries should make coding this up fairly straightforward. I have not worked with adafruit h/w before, but definitely interested I doing so.


  • honestly, I have always had pretty decent experiences with non-oem lead-acid batteries. my local battery place has a decent supply and longevity is roughly the same as the oem ones (3-4 years). I have never had any issues (type or frequency) that were not also an issue with oem batteries.

    almost no UPS mfcr makes their own batteries, so if you strip off the labeling from the oem ones, you may even find an exact replacement.

    edit: another advantage of a local place is the core-return rebate and disposal of your old batteries.