From 498287aedf6fd2c9bab989592167a4f25094f565 Mon Sep 17 00:00:00 2001
From: Andy Killorin <37423245+Speedy6451@users.noreply.github.com>
Date: Sat, 8 Feb 2025 21:55:29 -0500
Subject: [PATCH] calibrated voltmeter

---
 southbridge/src/main.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/southbridge/src/main.rs b/southbridge/src/main.rs
index 87fc784..abe79a2 100644
--- a/southbridge/src/main.rs
+++ b/southbridge/src/main.rs
@@ -199,7 +199,8 @@ async fn bus_voltage_monitor(adc: ADC, bus: PIN_28) {
 
     loop {
         let level = adc.read(&mut bus_voltage).await.unwrap();
-        SENSOR_DATA.send(SensorData::BusVoltage(level as f32)).await;
+        // empirically calculated against $20 microcenter voltmeter (10k & 33k divider circuit)
+        SENSOR_DATA.send(SensorData::BusVoltage(level as f32 / 251.6763848397)).await;
         Timer::after_millis(3).await;
     }
 }