display wifi status and battery percent

src/main.cpp

@@ -120,6 +120,14 @@ time_t getTimestamp() {
 }
 
 
+float mapf(float x, float in_min, float in_max, float out_min, float out_max) {
+  float newval = (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+  if (newval > out_max) newval = out_max;
+  if (newval < out_min) newval = out_min;
+  return newval;
+}
+
+
 void poweroffDevices() {
   display.powerOff();
 
@@ -175,13 +183,6 @@ void wifiConnect() {
   wifiMulti.addAP(WIFI_SSID2, WIFI_PASSWD2);
   wifiMulti.addAP(WIFI_SSID3, WIFI_PASSWD3);
 
-  Serial.println(WIFI_SSID);
-  Serial.println(WIFI_PASSWD);
-  Serial.println(WIFI_SSID2);
-  Serial.println(WIFI_PASSWD2);
-  Serial.println(WIFI_SSID3);
-  Serial.println(WIFI_PASSWD3);
-
   IPAddress ip = IPAddress(network.ip);
   IPAddress dns = IPAddress(network.dns);
   IPAddress subnet = IPAddress(network.subnet);
@@ -487,12 +488,19 @@ void displayValues() {
     display.drawLine(0,y_offset+10,display.width(), y_offset+10, GxEPD_BLACK);
 
     // Status
+    display.setFont(NULL);
     display.setCursor(190,y_offset+0);
     if(WiFi.status() == WL_CONNECTED) {
       display.print("W");
     } else {
       display.print("_");
     }
+    if (sensor_readings.voltage <= 4.0F) {
+      display.setCursor(220,y_offset+0);
+      int battery_percent = mapf(sensor_readings.voltage, 3.3, 4.1, 0, 100);
+      display.printf("%3d", battery_percent);
+      display.print(" \%");
+    }
 
     // Temp
     display.drawRect(0,y_offset+10,64,50,GxEPD_BLACK);