adding meassureExternalBattery

data/igate_conf.json

@@ -56,6 +56,8 @@
     "other": {
         "beaconInterval": 15,
         "rememberStationTime": 30,
-        "sendBatteryVoltage": false
+        "sendBatteryVoltage": false,
+        "externalVoltageMeasurement" : true,
+        "externalVoltagePin": 13
     }   
 }

src/configuration.cpp

@@ -37,6 +37,8 @@ void Configuration::readFile(fs::FS &fs, const char *fileName) {
     beaconInterval                  = data["other"]["beaconInterval"].as<int>();
     rememberStationTime             = data["other"]["rememberStationTime"].as<int>();
     sendBatteryVoltage              = data["other"]["sendBatteryVoltage"].as<bool>();
+    externalVoltageMeasurement      = data["other"]["externalVoltageMeasurement"].as<bool>();
+    externalVoltagePin              = data["other"]["externalVoltagePin"].as<int>();
 
     digi.comment                    = data["digi"]["comment"].as<String>();
     digi.latitude                   = data["digi"]["latitude"].as<double>();

src/configuration.h

@@ -75,6 +75,8 @@ public:
   int                   beaconInterval;
   int                   rememberStationTime;
   bool                  sendBatteryVoltage;
+  bool                  externalVoltageMeasurement;
+  int                   externalVoltagePin;
   std::vector<WiFi_AP>  wifiAPs;
   DIGI                  digi;
   APRS_IS               aprs_is;

src/utils.cpp

@@ -53,6 +53,21 @@ void notFound(AsyncWebServerRequest *request) {
     request->send(404, "text/plain", "Not found");
 }
 
+String meassureExternalBattery() {
+    int16_t sample;
+    int sampleNum = 50;
+    float readingCorrection = 0.0018;
+    float batteryVoltage, sampleSum;
+    sampleSum = 0;
+    for (int i=0; i<sampleNum; i++) {
+        sample = analogRead(Config.externalVoltagePin);
+        sampleSum += sample;
+        delayMicroseconds(50); 
+    }
+    batteryVoltage = ((sampleSum/sampleNum) - readingCorrection); 
+    return "VBat=" + String(batteryVoltage,2) + ")";
+}
+
 void processStatus() {
     String status = Config.callsign + ">APLRG1";
     if (stationMode==1 || stationMode==2 || (stationMode==5 && WiFi.status() == WL_CONNECTED)) {

src/utils.h

@@ -5,6 +5,7 @@
 
 namespace Utils {
 
+String meassureExternalBattery();
 void processStatus();
 String getLocalIP();
 void setupDisplay();