Crate gihex_hc_sr04
source ·Expand description
Introduction
This is the library used to access the HC-SR04 ultrasonic sensor.
This library inspired by hc-sr04
.
For more detail how to use this library see Example
Features
- Measure distance.
- Get last duration ultrasonic wave returned
-
Set environment temperature for compensation. Only available if feature
temperature
orhumidity
enabled. -
Set environment humidity for compensation. Only available if feature
humidity
enabled.
How to use?
To use this library, there are several things that must be done, such as:
- Implementing external interrupt (
EXTI
) withRAISING
andFAILING
trigger to the pinecho
(pin microcontroller that connected to the pinecho
HC-SR04 sensor).
let mut echo_pin = gpioa.pa3.into_pull_down_input(&mut gpioa.crl);
echo_pin.make_interrupt_source(&mut afio);
let mut exti = ctx.device.EXTI;
echo_pin.enable_interrupt(&mut exti);
echo_pin.trigger_on_edge(&mut exti, Edge::RisingFalling);
- Create an object that impelements trait
us_timer::TickerUs
. This object is used to count the number of ticks.
use stm32f1xx_hal::timer::{CounterUs, Instance};
pub struct MyCounter<TIM> {
counter: CounterUs<TIM>,
}
impl<TIM: Instance> MyCounter<TIM> {
fn new(counter: CounterUs<TIM>) -> Self {
Self { counter }
}
}
impl<TIM: Instance> TickerUs for MyCounter<TIM> {
fn get_tick(&self) -> u32 {
self.counter.now().ticks()
}
fn get_frequency(&self) -> u32 {
1_000_000
}
}
- Create HC-SR04 object and use it.
let hcsr04 = HcSR04::hc_sr04_new(trig_pin, &mut delay, &mut my_counter);
let distance=hcsr04.get_distance::<f32>(DistanceUnit::MilliMeter);
Modules
- This module containt traits that used to count number of ticks.
Structs
- Struct HC-SR04 sensor object
Enums
- Distance unit variants
- Error variant for HC-SR04
- Time unit variants