DHT22 View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
'DHT22' PDF : 10 Pages View PDF
Aosong Electronics Co.,Ltd
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Your specialist in innovating humidity & temperature sensors
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Host computer send start signal
and keep this signal at least 1ms
Sensor send out response signal
and keep this signal 80us
Host pull up voltage
-and wait sensor's response
Sensor pull up bus's voltage
Signal from host
Start data transmission
Signal from sensor
Single-bus signal
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Step 2: DHT22 send response signal to MCU
When DHT22 detect the start signal, DHT22 will send out low-voltage-level signal and this signal last 80us as
response signal, then program of DHT22 transform data-bus's voltage level from low to high level and last 80us
for DHT22's preparation to send data.
Check bellow picture for step 2:
7
Thomas Liu (Business Manager)
Email: thomasliu198518@yahoo.com.cn
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