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Figure 5 Data "1" Indication

If the response signal from DHT is always at high-voltage-level, it suggests that DHT is not

responding properly and please check the connection. When the last bit data is transmitted,

DHT11 pulls down the voltage level and keeps it for 50us. Then the Single-Bus voltage will be

pulled up by the resistor to set it back to the free status.

6. Electrical Characteristics

VDD=5V, T = 25℃ (unless otherwise stated)

Note: Sampling period at intervals should be no less than 1 second.

7. Attentions of application

(1) Operating conditions

Applying the DHT11 sensor beyond its working range stated in this datasheet can result in 3%RH

signal shift/discrepancy. The DHT11 sensor can recover to the calibrated status gradually when

it gets back to the normal operating condition and works within its range. Please refer to (3) of

Conditions

Minimum

Typical

Maximum

Power Supply

DC

3V

5V

5.5V

Current

Supply

Measuring

0.5mA

2.5mA

Average

0.2mA

1mA

Standby

100uA

150uA

Sampling

period

Second

1