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This library provides a platform-agnostic driver for theDHT11 and DHT22 sensors.

Use one of two functionsdht11::blocking::read anddht22::blocking::read to get a reading.

The only prerequisites are an embedded-hal implementation that provides:

• DelayNs-implementing type, for example Cortex-M microcontrollers typically use theSysTick.
• InputPin andOutputPin-implementing type, for example anOutput<OpenDrain> fromstm32f0xx_hal.

When initializing the pin as an output, the state of the pin might depend on the specific chipused. Some might pull the pin low by default causing the sensor to be confused when we actuallyread it for the first time. The same thing happens when the sensor is polled too quickly in succession.In both of those cases you will get aDhtError::Timeout.

To avoid this, you can pull the pin high when initializing it and polling the sensor with aninterval of at least 500ms (determined experimentally). Some sources state a refresh rate of 1 or even 2 seconds.

See the following examples for how to use the library.

• stm32f051r8

• stm32f051r8
• stm32f303vc

Compiling in debug mode may disturb the timing-sensitive parts of this crate and ultimately lead to failure.In this case, you will likely receive aTimeout error. Try compiling with--release instead.

To run the tests, use something likecargo test --lib --target x86_64-unknown-linux-gnu.