![]() ![]() Next, the sensor responds to the MCU “Start“ signal by pulling the line low for 80 us followed by a logic high signal that also lasts for 80 us. The MCU first pulls the data line low for at least 18 ms and then pulls it high for next 20-40 us before it releases it. The MCU pin must be configured as output for this purpose. ![]() The MCU initiates data transmission by issuing a “Start” signal. The following timing diagrams describe the data transfer protocol between a MCU and the DHT11 sensor. The protocol must be implemented in the firmware of the MCU with precise timing required by the sensor. It has got its own proprietary 1-wire protocol, and therefore, the communication between the sensor and a microcontroller is not possible through a direct interface with any of its peripherals. The sensor provides fully calibrated digital outputs for the two measurements. It can measure temperature from 0-50 ☌ with an accuracy of ☒☌ and relative humidity ranging from 20-90% with an accuracy of ±5%. The DHT11 sensor comes in a single row 4-pin package and operates from 3.3 to 5.5V power supply. About DHT11 (RHT01) relative humidity and temperature sensor:
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