 U8X8_SSD1306_128X32_UNIVISION_HW_I2C u8x8(U8X8_PIN_NONE, U8X8_PIN_SCL, U8X8_PIN_SDA); // Pins are Reset, SCL, SDA
 // --> Second choise of cheap I2C OLED 128X64 0.96" or 1.3"
 //U8X8_SSD1306_128X64_NONAME_HW_I2C u8x8(U8X8_PIN_NONE, U8X8_PIN_SCL, U8X8_PIN_SDA); // Pins are Reset, SCL, SDA
+// --> Third choise Heltec WiFi-Kit-8 with build-in OLED 128X32 0.91"
+//U8X8_SSD1306_128X32_UNIVISION_HW_I2C u8x8(U8X8_PIN_RESET, U8X8_PIN_SCL, U8X8_PIN_SDA); // Constracor for Heltec WiFi-Kit-8
 // gets called once at boot. Do all initialization that doesn't depend on
 // network here
 void userSetup() {

#include <DallasTemperature.h> //Dallastemperature sensor
#ifdef ARDUINO_ARCH_ESP32 //ESP32 boards
uint8_t SCL_PIN = 22; 
uint8_t SDA_PIN = 21; 
OneWire oneWire(23);
#else //ESP8266 boards
uint8_t SCL_PIN = 5;

//ESP8266 Wemos D1 mini board use SCL=5 SDA=4 while ESP32 Wemos32 mini board use SCL=22 SDA=21
#define U8X8_PIN_SCL SCL_PIN
#define U8X8_PIN_SDA SDA_PIN
//#define U8X8_PIN_RESET RST_PIN // Uncoment for Heltec WiFi-Kit-8
// Dallas sensor
DallasTemperature sensor(&oneWire);
long temptimer = millis();
