You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
This library provides a platform-agnostic driver for the DHT11 and DHT22 sensors.
Use one of two functions dht11::blocking::read and dht22::blocking::read to get a reading.
Usage
The only prerequisites are an embedded-hal implementation that provides:
DelayNs-implementing type, for example Cortex-M microcontrollers typically use the SysTick.
InputPin and OutputPin-implementing type, for example an Output<OpenDrain> from stm32f0xx_hal.
When initializing the pin as an output, the state of the pin might depend on the specific chip
used. Some might pull the pin low by default causing the sensor to be confused when we actually
read 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 a DhtError::Timeout.
To avoid this, you can pull the pin high when initializing it and polling the sensor with an
interval of at least 500ms (determined experimentally). Some sources state a refresh rate of 1 or even 2 seconds.
Example
See the following examples for how to use the library.
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 a Timeout error. Try compiling with --release instead.
Tests
To run the tests, use something like cargo test --lib --target x86_64-unknown-linux-gnu.
About
Rust embedded-hal based driver for the DHT11/DHT22 sensor