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16 lines
631 B
16 lines
631 B
7 months ago
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use crate::{config::*, io::get_input_voltage, GenericResult};
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pub fn get_temperature() -> GenericResult<f32> {
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const THERMISTOR_NOMINAL_RESISTANCE: f32 = 10_000.;
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const THERMISTOR_NOMINAL_TEMPERATURE: f32 = 298.15;
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const THERMISTOR_CONSTANT: f32 = 3950.;
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let voltage = get_input_voltage(THERMISTOR_ANALOG_PIN)?;
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let resistance = (LOGIC_LEVEL / voltage - 1.) * THERMISTOR_VOLTAGE_DIVIDER_RESISTANCE;
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let temperature = 1.
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/ ((1. / THERMISTOR_NOMINAL_TEMPERATURE)
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+ (1. / THERMISTOR_CONSTANT * f32::ln(resistance / THERMISTOR_NOMINAL_RESISTANCE)))
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- 273.15;
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Ok(temperature)
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}
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