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* dht: Fix sensor reading from DHT22 (#239) Looking at the datasheet for DHT22, it claims to need a delay of 18ms, not 800us. Change to use the same delay as DHT11. Tested working with NodeMCUv3 and DHT22 sensor with board with built-in resistor. * dht: Add model DHT22_TYPE2 with 2ms delay instead of 0.8ms The model DHT22_TYPE2 is exactly the same as DHT22, but uses a different delay. * dht: Fix bogus negative temperature reading on DHT22_TYPE2 The workaround for negative numbers associated with DHT22s can be skipped on these sensors.
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