/*
Simplified Embedded Rust: ESP Core Library Edition
Programming ADCs - Temperature Sensing Application Example
*/
#![no_std]
#![no_main]
use esp_backtrace as _;
use esp_hal::{
analog::adc::{AdcConfig, Attenuation, ADC},
clock::ClockControl,
delay::Delay,
gpio::IO,
peripherals::Peripherals,
prelude::*,
};
use esp_println::println;
use libm::log;
#[entry]
fn main() -> ! {
let peripherals = Peripherals::take();
let system = peripherals.SYSTEM.split();
let clocks = ClockControl::max(system.clock_control).freeze();
let delay = Delay::new(&clocks);
// Instantiate and Create Handle for IO
let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
// Create handle for ADC configuration parameters
let mut adc_config = AdcConfig::new();
// Configure ADC pin
let mut adc_pin =
adc_config.enable_pin(io.pins.gpio4.into_analog(), Attenuation::Attenuation11dB);
// Create ADC Driver
let mut adc = ADC::new(peripherals.ADC1, adc_config);
const B: f64 = 3950.0; // B value of the thermistor
const VMAX: f64 = 4095.0; // Full Range Voltage
loop {
// Get ADC reading
let sample: u16 = adc.read_oneshot(&mut adc_pin).unwrap();
// For blocking read
// let sample: u16 = nb::block!(adc.read_oneshot(&mut adc_pin)).unwrap();
// Convert to temperature
let temperature = 1. / (log(1. / (VMAX / sample as f64 - 1.)) / B + 1.0 / 298.15) - 273.15;
// Print the temperature output
println!("Temperature {:02} Celcius\r", temperature);
// Wait some time before next measurement
delay.delay_millis(500_u32);
}
}