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Testing three DHT22 sensors

Yea, I thought it was a good idea to repeat a success (never change a winning horse?). For that reason I made three temperature and humidity sensors. To verify the working I placed them next to eachother and analysed the data on Thingspeak. See here the result, looks great isnt it?

 

Ok, not really… Looks like I have got a problem with one of them. The humidity data of one of the sensors (red line) is is 20 to 30% off.

I think that its due to a defect sensor and that it is not the power line or someting else. First thing I am going to try is to remove the 8K pull down resistor between the power and data IN line.

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