849a0e174f
modify RP2040 adc example to get inside biased bipolar diode voltage,
then convert this temperature sensor data into Celsius degree,
according to chapter 4.9.5. Temperature Sensor in RP2040 datasheet.
38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_rp::adc::{Adc, Config};
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use embassy_rp::interrupt;
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use embassy_time::{Duration, Timer};
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use {defmt_rtt as _, panic_probe as _};
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let p = embassy_rp::init(Default::default());
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let irq = interrupt::take!(ADC_IRQ_FIFO);
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let mut adc = Adc::new(p.ADC, irq, Config::default());
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let mut p26 = p.PIN_26;
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let mut p27 = p.PIN_27;
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let mut p28 = p.PIN_28;
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loop {
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let level = adc.read(&mut p26).await;
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info!("Pin 26 ADC: {}", level);
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let level = adc.read(&mut p27).await;
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info!("Pin 27 ADC: {}", level);
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let level = adc.read(&mut p28).await;
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info!("Pin 28 ADC: {}", level);
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let temp = adc.read_temperature().await;
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info!("Temp: {} degrees", convert_to_celsius(temp));
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Timer::after(Duration::from_secs(1)).await;
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}
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}
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fn convert_to_celsius(raw_temp: u16) -> f32 {
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// According to chapter 4.9.5. Temperature Sensor in RP2040 datasheet
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27.0 - (raw_temp as f32 * 3.3 / 4096.0 -0.706)/0.001721 as f32
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} |