Added code to measure voltages using an ADS1015 (wip)

ESP32/platformio.ini

@@ -18,3 +18,4 @@ monitor_speed = 115200
 upload_speed = 921600
 build_type = debug
 monitor_filters = esp32_exception_decoder
+lib_deps = adafruit/Adafruit ADS1X15@^2.4.0

ESP32/src/vehicle-monitor.cpp

@@ -14,6 +14,8 @@
 
 #include <Dps310.h>
 
+#include <Adafruit_ADS1X15.h>
+
 #include "wifi-credentials.h"
 
 #include <limits>
@@ -26,6 +28,7 @@ AsyncWebServer server(80);
 
 ADC currentSensor(36);
 ADC batterySensor(39);
+Adafruit_ADS1015 currentSensor2;
 Dps310 pressureSensor = Dps310();
 const int8_t speedSensorPin = 13;
 const int8_t debugLedPin = 2;
@@ -38,7 +41,8 @@ const float wheelCircumferenceMeters = wheelDiameterInches * 0.0254f * 3.1415f /
 const uint32_t wheelCircumferenceMillimeters = (uint32_t)(wheelCircumferenceMeters * 1000.0f + 0.5f);
 
 uint16_t batteryVoltage = 0; // in mV
-uint16_t batteryOutputCurrent = 0; // in mV
+uint16_t batteryOutputCurrent = 0; // in mA
+uint16_t batteryOutputCurrent2 = 0; // in mA
 int16_t temperature = 0; // in tenth of °C
 int32_t altitude = 0; // in mm above sea level (can be negative if below sea level, or depending on atmospheric conditions)
 
@@ -197,6 +201,8 @@ void setup()
 
 	pressureSensor.begin(Wire);
 
+	currentSensor2.begin(0x48, &Wire);
+
 	server.on("/api/debug/log", HTTP_GET, [](AsyncWebServerRequest *request){
 		AsyncResponseStream *response = request->beginResponseStream("text/plain");
 		int logPartIdx = 0;
@@ -351,6 +357,12 @@ void handle_ADC_measures()
 	batteryVoltage = (uint16_t)(averageV * 1000.0f + 0.5f);
 	batteryOutputCurrent = (uint16_t)(averageC * 1000.0f + 0.5f);
 
+	int16_t batteryOutputCurrent2Int = currentSensor2.readADC_Differential_0_1();
+	float batteryOutputCurrent2Volts = (float)batteryOutputCurrent2Int * 3.0f / 1000.0f;
+	const float shuntResistanceValue = 0.01f; // in ohms
+	float batteryOutputCurrent2Amps = batteryOutputCurrent2Volts / shuntResistanceValue;
+	batteryOutputCurrent2 = (uint16_t)(batteryOutputCurrent2Amps * 1000.0f + 0.5f);
+
 	#if DUMMY_DATA
 	batteryVoltage = (uint16_t)((float)random(4000, 4020) / 100.0f * 1000.0f + 0.5f);
 	batteryOutputCurrent = (uint16_t)(max(0.0f, sinf((float)millis()/30000.0f)) * 25.0f * 1000.0f + 0.5f);