Aosong Electronics Co.,Ltd

---------------------------------------------------------------------------------------------------------------------

Your specialist in innovating humidity & temperature sensors

------------------------------------------------------------------------------------------------------------------------------------

Start transmit 1bit data

Start transmit next bit data

26-28us voltage-length means data "0"

Host signal

Sesnor's signal

Single-bus signal

------------------------------------------------------------------------------------------------------------------------------------

Step 3: DHT22 send data to MCU

When DHT22 is sending data to MCU, every bit's transmission begin with low-voltage-level that last 50us, the

following high-voltage-level signal's length decide the bit is "1" or "0".

Check bellow picture for step 3:

Thomas Liu (Business Manager)

Email: thomasliu198518@yahoo.com.cn

8