A simple library for reading data from a DHT22 sensor

Dependents:   frdm_dht22_example DISCO-L053C8_ePD_demo

Simple library for doing DHT22 sensor readings. I've tested this on an FRDM K64F, but I see no reason it wouldn't work on other platforms.

Note that the data in `dht22_data_t` is fixed point, to convert to a normal number, divide by 10.

There is an example application here: https://developer.mbed.org/users/co657_sjc80/code/frdm_dht22_example/

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