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Merge #1119

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1119: add convert_to_celsius function in the adc module r=lulf a=overheat

    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.

Co-authored-by: Aaron Tsui <aaron.tsui@outlook.com>
This commit is contained in:
bors[bot] 2022-12-20 17:25:23 +00:00 committed by GitHub
commit 46fd82d184
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1 changed files with 6 additions and 1 deletions
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7
examples/rp/src/bin/adc.rs
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@ -27,7 +27,12 @@ async fn main(_spawner: Spawner) {
let level = adc.read(&mut p28).await;
info!("Pin 28 ADC: {}", level);
let temp = adc.read_temperature().await;
info!("Temp: {}", temp);
info!("Temp: {} degrees", convert_to_celsius(temp));
Timer::after(Duration::from_secs(1)).await;
}
}
fn convert_to_celsius(raw_temp: u16) -> f32 {
// According to chapter 4.9.5. Temperature Sensor in RP2040 datasheet
27.0 - (raw_temp as f32 * 3.3 / 4096.0 - 0.706) / 0.001721 as f32
}