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A project log for Aurai - retrofit dumb air conditioners

Helping traditional air conditioners join the Internet of Things.

Thomas RThomas R 08/15/2014 at 05:220 Comments

I realized I put a LM3490 3.3v LDO on the board rather than a LM3940. The 3490 is a smaller SOT-23 device delivering 100ma of current. The 3940 is a SOT-223 device delivering up to 1a. I'll have to figure out a way of putting the larger regulator on the spoke board (maybe using header pins as stilts?).

Luckily, the hub board hasn't been sent to the fab house yet. And it looks like it's time for rev 2 of the spoke board.

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