Battery Monitor for T-Beams

README.md

@@ -50,6 +50,7 @@ ____________________________________________________
 ____________________________________________________
 ## Timeline (Versions):
 
+- 2023.05.27 Battery Monitor for internal and External Voltages (to make board sleep and avoid low discharge of batterys) T-Beam boards now with Battery readings as well.
 - 2024.05.23 Forced Reboot Mode added.
 - 2024.05.22 Experimental backup-Digirepeater-Mode when "only" iGate mode loses WiFi connection added.
 - 2024.05.20 WebConfig update to control whether Messages and Objects should be Tx to RF.

src/LoRa_APRS_iGate.cpp

@@ -37,7 +37,7 @@ ________________________________________________________________________________
     #include "A7670_utils.h"
 #endif
 
-String          versionDate             = "2024.05.24";
+String          versionDate             = "2024.05.27";
 Configuration   Config;
 WiFiClient      espClient;
 

src/battery_utils.cpp

@@ -1,6 +1,7 @@
 #include "battery_utils.h"
 #include "configuration.h"
 #include "boards_pinout.h"
+#include "power_utils.h"
 #include "utils.h"
 
 extern  Configuration               Config;
@@ -25,42 +26,50 @@ namespace BATTERY_Utils {
     }
 
     float checkInternalVoltage() { 
-        int sample;
+        #if defined(HAS_AXP192) || defined(HAS_AXP2101)
-        int sampleSum = 0;
+            if(POWER_Utils::isBatteryConnected()) {
-        #ifdef ADC_CTRL
+                return POWER_Utils::getBatteryVoltage();
-            #if defined(HELTEC_WSL_V3) || defined(HELTEC_WIRELESS_TRACKER)
+            } else {
-                digitalWrite(ADC_CTRL, HIGH);
+                return 0.0;
-            #endif
+            }
-            #if defined(HELTEC_V3) || defined(HELTEC_V2)
-                digitalWrite(ADC_CTRL, LOW);
-            #endif
-        #endif
-
-        for (int i = 0; i < 100; i++) {
-            #ifdef BATTERY_PIN
-                sample = analogRead(BATTERY_PIN);
-            #endif
-            #if defined(ESP32_DIY_LoRa) || defined(ESP32_DIY_1W_LoRa)
-                sample = 0;
-            #endif
-            sampleSum += sample;
-            delayMicroseconds(50); 
-        }
-
-        #ifdef ADC_CTRL
-            #if defined(HELTEC_WSL_V3) || defined(HELTEC_WIRELESS_TRACKER)
-                digitalWrite(ADC_CTRL, LOW);
-            #endif
-            #if defined(HELTEC_V3) || defined(HELTEC_V2)
-                digitalWrite(ADC_CTRL, HIGH);
-            #endif
-            double inputDivider = (1.0 / (390.0 + 100.0)) * 100.0;  // The voltage divider is a 390k + 100k resistor in series, 100k on the low side.
-            return (((sampleSum/100) * adcReadingTransformation) / inputDivider) + 0.285; // Yes, this offset is excessive, but the ADC on the ESP32s3 is quite inaccurate and noisy. Adjust to own measurements.
         #else
-            return (2 * (sampleSum/100) * adcReadingTransformation) + voltageDividerCorrection; // raw voltage without mapping
+            int sample;
-        #endif
+            int sampleSum = 0;
+            #ifdef ADC_CTRL
+                #if defined(HELTEC_WSL_V3) || defined(HELTEC_WIRELESS_TRACKER)
+                    digitalWrite(ADC_CTRL, HIGH);
+                #endif
+                #if defined(HELTEC_V3) || defined(HELTEC_V2)
+                    digitalWrite(ADC_CTRL, LOW);
+                #endif
+            #endif
 
-        // return mapVoltage(voltage, 3.34, 4.71, 3.0, 4.2); // mapped voltage
+            for (int i = 0; i < 100; i++) {
+                #ifdef BATTERY_PIN
+                    sample = analogRead(BATTERY_PIN);
+                #endif
+                #if defined(ESP32_DIY_LoRa) || defined(ESP32_DIY_1W_LoRa)
+                    sample = 0;
+                #endif
+                sampleSum += sample;
+                delayMicroseconds(50); 
+            }
+
+            #ifdef ADC_CTRL
+                #if defined(HELTEC_WSL_V3) || defined(HELTEC_WIRELESS_TRACKER)
+                    digitalWrite(ADC_CTRL, LOW);
+                #endif
+                #if defined(HELTEC_V3) || defined(HELTEC_V2)
+                    digitalWrite(ADC_CTRL, HIGH);
+                #endif
+                double inputDivider = (1.0 / (390.0 + 100.0)) * 100.0;  // The voltage divider is a 390k + 100k resistor in series, 100k on the low side.
+                return (((sampleSum/100) * adcReadingTransformation) / inputDivider) + 0.285; // Yes, this offset is excessive, but the ADC on the ESP32s3 is quite inaccurate and noisy. Adjust to own measurements.
+            #else
+                return (2 * (sampleSum/100) * adcReadingTransformation) + voltageDividerCorrection; // raw voltage without mapping
+            #endif
+
+            // return mapVoltage(voltage, 3.34, 4.71, 3.0, 4.2); // mapped voltage
+        #endif
     }
 
     float checkExternalVoltage() {

src/power_utils.cpp

@@ -21,6 +21,22 @@ extern Configuration    Config;
 
 namespace POWER_Utils {
 
+    double getBatteryVoltage() {
+        #if defined(HAS_AXP192) || defined(HAS_AXP2101)
+            return (PMU.getBattVoltage() / 1000.0);
+        #else
+            return 0.0;
+        #endif
+    }
+
+    bool isBatteryConnected() {
+        #if defined(HAS_AXP192) || defined(HAS_AXP2101)
+            return PMU.isBatteryConnect();
+        #else
+            return false;
+        #endif
+    }
+
     void activateMeasurement() {
         #if defined(HAS_AXP192) || defined(HAS_AXP2101)
             PMU.disableTSPinMeasure();

src/power_utils.h

@@ -11,6 +11,8 @@
 
 namespace POWER_Utils {
 
+    double getBatteryVoltage();
+    bool isBatteryConnected();
     void activateMeasurement();
     void activateLoRa();
     void deactivateLoRa();

src/utils.cpp

@@ -122,7 +122,7 @@ namespace Utils {
             beaconPacket += Config.beacon.comment;
             secondaryBeaconPacket += Config.beacon.comment;
 
-            #ifdef BATTERY_PIN
+            #if defined(BATTERY_PIN) || defined(HAS_AXP192) || defined(HAS_AXP2101)
                 if (Config.battery.sendInternalVoltage || Config.battery.monitorInternalVoltage) {
                     float internalVoltage       = BATTERY_Utils::checkInternalVoltage();
                     String internalVoltageInfo  = String(internalVoltage,2) + "V";