47 lines
1.2 KiB
Rust
47 lines
1.2 KiB
Rust
use std::rc::Rc;
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use std::time::Duration;
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use dht_hal_drv::{dht_split_init, dht_split_read, DhtType};
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use spin_sleep;
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use rppal::gpio::IoPin;
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use crate::open_pin::OpenPin;
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use crate::{Measurement, Sensor};
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pub struct DHT22 {
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location: Rc<String>,
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pin: OpenPin,
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}
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impl DHT22 {
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pub fn new(pin: IoPin, location: String) -> Self {
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DHT22 {
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location: Rc::new(location),
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pin: OpenPin::new(pin),
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}
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}
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}
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impl Sensor for DHT22 {
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fn read(&mut self) -> Vec<crate::Measurement> {
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let mut delay_us = |d: u16| {
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// We are using here more accurate delays than in std library
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spin_sleep::sleep(Duration::from_micros(d as u64));
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};
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self.pin.switch_output();
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if let Err(_) = dht_split_init(&mut self.pin, &mut delay_us) {
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return vec![];
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}
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self.pin.switch_input();
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match dht_split_read(DhtType::DHT22, &mut self.pin, &mut delay_us) {
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Ok(readings) => vec![
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Measurement::new(self.location.clone(), "temperature", readings.temperature()),
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Measurement::new(self.location.clone(), "humidity", readings.humidity()),
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],
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Err(_) =>
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vec![]
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}
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}
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}
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