hardware: Use +5V supply for RHT03 rather than gated sensor power rail
authorPhilip Withnall <philip@tecnocode.co.uk>
Sun, 9 Dec 2012 23:25:47 +0000 (23:25 +0000)
committerPhilip Withnall <philip@tecnocode.co.uk>
Sun, 9 Dec 2012 23:25:47 +0000 (23:25 +0000)
commit3ca4019b26895acab68c834e5c42cea7db0a457d
tree481089ee9121ab7d4f398c2ad834bcfb247d7056
parent3955911bd9a2074fe8367f06e739562aa74acf00
hardware: Use +5V supply for RHT03 rather than gated sensor power rail

The RHT03 doesn’t like having its power gated, and seems to go into a stuck
state when re-powered, meaning I couldn’t find a way to get a measurement
response out of it afterwards.

Obviously, if the sensor is power cycled completely it works, so there must
be something continuing to power it (a little) while the power rail is gated.
I can’t work out what it is, however. Having spent many hours on the problem,
I’m giving up and unconditionally powering the RHT03. This results in a
current draw of about 3mA, which is (just about) acceptable.
main.sch