I recently purchased a DHT22 (Also known as RHT03 on Sparkfun) from Proto-Pic temp and humidity sensor with the aim of using it as an outdoor sensor in the garden. Although there are several DHT22 libraries on github I couldn't get the nethoncho one (or the patched forks) to return anything other than checksum error.
However the combined dht11/22 one I found linked on arduino.cc seems to work just fine. Need to test with -ve temps next but an overnight plot on the bench seems reasonable
Despite many forums saying that it needs 5v I've managed to get it working OK with the 3.3v pin on my nanode, next step is to test on a jeenode and send the output via RF. Oh, and then get a solar panel to run the thing...
Garden Irrigation, Pt 1
Some more background to my 'home assistant powered irrigation system' -- I'll write up a couple more articles as build progresse...


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At home we have a small (2.5KW - 10*250w panels) PV system to try and offset our daytime electricity usage. This is connected to a 'Grow...
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At home I have a Fine Offset ( this one branded by Jaycar) weather station that publishes to weather.two-fifteen.com via weewx (this is mu...
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As you may have noticed, I'm quite fond of Grafana and use it at home and work. One of the dashboards I have at work is the general sta...

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