Module max31865::examples::_02_rpi

Raspberry Pi demo

Connections

IMPORTANT: Do not use PIN24 / BCM8 / CE0 as the NCS pin

• PIN1 = 3V3 = VCC
• PIN19 = BCM10 = MOSI (SDA)
• PIN21 = BCM9 = MISO (AD0)
• PIN23 = BCM11 = SCLK (SCL)
• PIN22 = BCM25 = NCS
• PIN15 = BCM22 = RDY
• PIN6 = GND = GND

for further reference check https://pinout.xyz/#

 
extern crate linux_embedded_hal as lin_hal;
extern crate embedded_hal as hal;
extern crate max31865;
 
use max31865::{Max31865, FilterMode, SensorType};
use lin_hal::spidev::{self, SpidevOptions};
use lin_hal::{Pin, Spidev};
use lin_hal::sysfs_gpio::Direction;
use hal::digital::{InputPin, OutputPin};
 
struct HackInputPin<'a> {
    pin: &'a OutputPin
}
 
impl<'a> HackInputPin<'a> {
    fn new(p : &'a OutputPin) -> HackInputPin {
        HackInputPin {
            pin: p
        }
    }
}
 
impl<'a> InputPin for HackInputPin<'a> {
    fn is_low(&self) -> bool {
        self.pin.is_low()
    }
 
    fn is_high(&self) -> bool {
        self.pin.is_high()
    }
}
 
fn main() {
    let mut spi = Spidev::open("/dev/spidev0.0").unwrap();
    let options = SpidevOptions::new()
        .max_speed_hz(1_000_000)
        .mode(spidev::SPI_MODE_3)
        .build();
    spi.configure(&options).unwrap();
 
    let ncs = Pin::new(25);
    ncs.export().unwrap();
    while !ncs.is_exported() {}
    ncs.set_direction(Direction::Out).unwrap();
    ncs.set_value(1).unwrap();
 
    let rdy = Pin::new(22);
    rdy.export().unwrap();
    while !rdy.is_exported() {}
    rdy.set_direction(Direction::In).unwrap();
    rdy.set_value(1).unwrap();
    let rdyi = HackInputPin::new(&rdy);
 
    let mut max31865 = Max31865::new(spi, ncs, rdyi).unwrap();
 
    // setup the sensor so it repeatedly performs conversion and 
    // informs us over the ready pin
    max31865.configure(true, true, false, SensorType::ThreeWire, FilterMode::Filter50Hz).unwrap();
 
    loop {
        // if the sensor is ready, read the value and print it otherwise do nothing
        // one may not want to loop like this
        if max31865.is_ready().unwrap() {
            let temp = max31865.read_default_conversion().unwrap();
 
            println!("The temperature is {}", (temp as f64)/100.);
        }
    }
}