Add preliminary pressure transducer implementation with INA219

pod-operation/Cargo.toml

@@ -13,4 +13,5 @@ serde = { version = "1.0.192", features = ["derive"] }
 serde_json = "1.0.108"
 tracing = "0.1.40"
 tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
-rppal = "0.17.1"
+rppal = { version = "0.17.1", features = ["hal"] }
+ina219 = "0.1.0"

pod-operation/src/components/ina219.rs

@@ -0,0 +1,10 @@
+use ina219::INA219;
+use rppal::i2c::I2c;
+use tracing::debug;
+
+pub fn read_current(ina: &mut INA219<I2c>) -> f32 {
+	ina.calibrate(0xffff).unwrap();
+	debug!("Calibrating INA219");
+
+	ina.current().unwrap() as f32 / 160.0
+}

pod-operation/src/components/mod.rs

@@ -1 +1,3 @@
+pub mod ina219;
+pub mod pressure_transducer;
 pub mod signal_light;

pod-operation/src/components/pressure_transducer.rs

@@ -0,0 +1,21 @@
+use crate::components::ina219::read_current;
+use ina219::INA219;
+use rppal::i2c::I2c;
+use tracing::debug;
+
+pub struct PressureTransducer {
+	ina: INA219<I2c>,
+}
+
+impl PressureTransducer {
+	pub fn new(ina219_addr: u8) -> Self {
+		let device = I2c::new().unwrap();
+		let ina219 = INA219::new(device, ina219_addr);
+		debug!("Initialized I2C and INA219");
+		PressureTransducer { ina: ina219 }
+	}
+
+	pub fn read(&mut self) -> f32 {
+		read_current(&mut self.ina)
+	}
+}

pod-operation/src/demo.rs

@@ -1,10 +1,13 @@
 use tracing::info;
 
+use crate::components::pressure_transducer::PressureTransducer;
 use crate::components::signal_light::SignalLight;
 
 pub async fn blink(mut signal_light: SignalLight) {
 	let mut i = 0;
 
+	let mut pt = PressureTransducer::new(0x40);
+
 	info!("Starting blink demo.");
 	loop {
 		tokio::time::sleep(std::time::Duration::from_millis(500)).await;
@@ -14,6 +17,8 @@ pub async fn blink(mut signal_light: SignalLight) {
 			signal_light.disable();
 		}
 
+		println!("Current reading: {:?}", pt.read());
+
 		i += 1;
 	}
 }