Fix battery voltage read problem

Author: Heltec-Aaron-Lee

examples/ESP32/ADC_Read_Voltage/Battery_power/Battery_power.ino

@@ -12,8 +12,8 @@
  * - WIFI Kit series V1 don't have Vext control function;
  *
  * HelTec AutoMation, Chengdu, China.
- * �ɶ��������Զ����Ƽ����޹�˾
- * www.heltec.cn
+ * 成都惠利特自动化科技有限公司
+ * https://heltec.org
  * [email protected]
  *
  * this project also release in GitHub:
@@ -24,24 +24,15 @@
 #include <Wire.h>
 #include "heltec.h"
 
-//#define Vext 21
-//
-//#define SDA      4  //OLED SDA pin
-//#define SCL     15 //OLED SCL pin
-//#define RST     16 //OLED nRST pin
 #define Fbattery    3700  //The default battery is 3700mv when the battery is fully charged.
 
 float XS = 0.00225;      //The returned reading is multiplied by this XS to get the battery voltage.
 uint16_t MUL = 1000;
 uint16_t MMUL = 100;
-//SSD1306  display(0x3c, SDA, SCL, RST);
 
 void setup()
 {
-//	pinMode(Vext, OUTPUT);
-//	digitalWrite(Vext, LOW);
-//	delay(1000);
-Heltec.begin(true /*DisplayEnable Enable*/, false /*LoRa Enable*/, true /*Serial Enable*/);
+   Heltec.begin(true /*DisplayEnable Enable*/, false /*LoRa Enable*/, true /*Serial Enable*/);
 
 	Heltec.display->init();
 	Heltec.display->flipScreenVertically();
@@ -59,18 +50,20 @@ Heltec.begin(true /*DisplayEnable Enable*/, false /*LoRa Enable*/, true /*Serial
 
 void loop()
 {
-   uint16_t c  =  analogRead(13)*XS*MUL;
-   //uint16_t d  =  (analogRead(13)*XS*MUL*MMUL)/Fbattery;
-   Serial.println(analogRead(13));
-   //Serial.println((String)d);
-  // Serial.printf("%x",analogRead(13));
+   //WiFi LoRa 32        -- hardare versrion ≥ 2.3
+   //WiFi Kit 32         -- hardare versrion ≥ 2
+   //Wireless Stick      -- hardare versrion ≥ 2.3
+   //Wireless Stick Lite -- hardare versrion ≥ 2.3
+   //Battery voltage read pin changed from GPIO13 to GPI37
+   uint16_t c  =  analogRead(37)*XS*MUL;
+   Serial.println(analogRead(37));
+   // uint16_t c  =  analogRead(13)*XS*MUL;
+   // Serial.println(analogRead(13));
+
    Heltec.display->drawString(0, 0, "Remaining battery still has:");
    Heltec.display->drawString(0, 10, "VBAT:");
    Heltec.display->drawString(35, 10, (String)c);
    Heltec.display->drawString(60, 10, "(mV)");
-  // Heltec.display->drawString(90, 10, (String)d);
-  // Heltec.display->drawString(98, 10, ".";
-  // Heltec.display->drawString(107, 10, "%");
    Heltec.display->display();
    delay(2000);
    Heltec.display->clear();

src/heltec.cpp

@@ -21,7 +21,7 @@ Heltec_ESP32::~Heltec_ESP32(){
 
 void Heltec_ESP32::begin(bool DisplayEnable, bool LoRaEnable, bool SerialEnable, bool PABOOST, long BAND) {
 
-#if defined( WIFI_LoRa_32_V2 ) || defined( Wireless_Stick ) || defined( Wireless_Stick_Lite )
+#if defined( WIFI_LoRa_32_V2 ) || defined( Wireless_Stick ) || defined( Wireless_Stick_Lite ) || defined(WIFI_Kit_32)
 
 	VextON();
 #endif