Move back to official crates.io scd4x

Cargo.lock

@@ -1360,9 +1360,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.26"
+version = "0.4.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30bde2b3dc3671ae49d8e2e9f044c7c005836e7a023ee57cffa25ab82764bb9e"
+checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
 
 [[package]]
 name = "memchr"
@@ -1999,9 +1999,9 @@ dependencies = [
 
 [[package]]
 name = "scd4x"
-version = "0.4.0"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "550fedc97e7880654aa7dc840f5eb3b2201a01aae566c4584a3601bb0086cd4c"
+checksum = "455974f1daa137284e9e282362d1074f004028a77ee84c6bb1508c9e89646153"
 dependencies = [
  "embedded-hal 1.0.0",
  "log",

Cargo.toml

@@ -44,7 +44,7 @@ embedded-graphics = "0.8.1"
 embedded-graphics-framebuf = "0.5.0"
 
 # Peripherals
-scd4x = { version = "0.4.0", features = ["scd41"] }
+scd4x = { version = "0.4.1", features = ["scd41"] }
 ssd1351 = "0.5.0"
 display-interface-spi = "0.5.0"
 

src/sensor_task.rs

@@ -8,11 +8,15 @@ use scd4x::Scd4x;
 
 use crate::{I2c0BusMutex, SENSOR_DATA_SIGNAL};
 
+const BACKGROUND_CO2_PPM: u16 = 427;
+
 /// Read CO2/temp./humidity data from the sensor
 #[embassy_executor::task]
 pub async fn sensor_read_task(i2c_bus: &'static I2c0BusMutex) {
     debug_rprintln!("Sensor read task started");
 
+    // Initialise SCD41
+
     Timer::after_millis(30).await; // SCD41 power-up delay
     let i2c_dev = I2cDevice::new(i2c_bus);
 
@@ -20,6 +24,11 @@ pub async fn sensor_read_task(i2c_bus: &'static I2c0BusMutex) {
     scd41.wake_up();
     scd41.reinit().unwrap();
 
+    // https://climate.nasa.gov/vital-signs/carbon-dioxide/?intent=121
+    scd41
+        .set_automatic_self_calibration_target(BACKGROUND_CO2_PPM)
+        .unwrap();
+
     match scd41.serial_number() {
         Ok(serial) => debug_rprintln!("[SCD41] Serial number: {}", serial),
         Err(error) => debug_rprintln!(
@@ -28,6 +37,8 @@ pub async fn sensor_read_task(i2c_bus: &'static I2c0BusMutex) {
         ),
     }
 
+    // Measurement loop
+
     scd41.start_periodic_measurement().unwrap();
 
     loop {
@@ -53,4 +64,6 @@ pub async fn sensor_read_task(i2c_bus: &'static I2c0BusMutex) {
             }
         }
     }
+
+    scd41.stop_periodic_measurement().unwrap();
 }