RHT04 Datasheet, PDF (4/5 Pages) List of Unclassifed Manufacturers – Digital relative humidity & temperature sensor

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2). Step 2: RHT04 send data to MCU
When RHT04 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". See below figures:
Attention:
If signal from RHT04 is always high-voltage-level, it means RHT04 is not working properly, please check the
electrical connection status.
7. Electrical Characteristics:
Items
Condition Min
Power supply DC
3.3
Current supply Measuring 1
Stand-by 40
Collecting
Second
period
Typical
5
Null
2
Max Unit
6
V
1.5 mA
50
uA
Second
8. Attentions of application:
(1) Operating and storage conditions
We don't recommend the applying RH-range beyond the range stated in this specification. The RHT04 sensor
can recover after working in abnormal operating condition to calibrated status, but will accelerate sensors' aging.
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