display battery voltage

FamilyPlanner.ino

@@ -74,6 +74,7 @@ RTC_DATA_ATTR int timeDigits[4] = { 9, 5, 0, 0 }; // start time: 23:59
 RTC_DATA_ATTR char calName[5][31];
 RTC_DATA_ATTR char calStart[5][26];
 RTC_DATA_ATTR char calTitle[5][81];
+RTC_DATA_ATTR double voltage;
 
 Inkplate display(INKPLATE_1BIT);       //Create an object on Inkplate library and also set library into 1 Bit mode
 Network network;                       //Our networking functions, see Network.cpp for info
@@ -83,6 +84,7 @@ void drawTime();
 void drawCal();
 void drawCalLine1(int entry);
 void drawCalLine2(int entry);
+void drawBat();
 
 void setup() {
     bool networking = false;
@@ -95,11 +97,14 @@ void setup() {
     //restore old bitmap (before the deep sleep)
     drawTime();
     drawCal();
+    drawBat();
     display.load1b();
 
     //Update data
-    if ((timeDigits[1] == 5) && (timeDigits[0] == 9)) {
-        network.begin();                                              // every hour set the time from internet
+    if ((timeDigits[1] == 5) && (timeDigits[0] == 9)) {               // every hour read the battery voltage and set the time from internet
+        adc_power_on();
+        voltage = display.readBattery();
+        network.begin();
         network.off();
         networking = true;
     }
@@ -109,6 +114,7 @@ void setup() {
     display.clearDisplay();
     drawTime();
     drawCal();
+    drawBat();
 
     //Actually display all data
     if (timeDigits[0]+timeDigits[1] == 0 || networking) {
@@ -215,3 +221,12 @@ void drawCalLine2(int entry)
     display.setTextWrap(false);
     display.print(calTitle[entry]);
 }
+
+void drawBat()
+{
+    display.setFont(NULL);
+    display.setTextSize(2);
+    display.setCursor(275, 10);
+    display.print(voltage);
+    display.print("V");
+}