This section is taken from another project that I took part in, here

Download and install the Arduino IDE from: https://www.arduino.cc/en/main/software

Heltec support two sets of libraries to simplify the use of the integrated OLED, LoRa and other modules of the WIFI LoRa 32 (V1) board.

[Note: this section is adapted from Heltec's instructions which can be accessed here]

Download the repository WiFi_Kit_series as zip and extract it to /Documents/Arduino/hardware/heltec. Create the folders manually if they have not been created.

Navigate to /Documents/Arduino/hardware/heltec/esp32/tools, double-click on get.exe and wait for the script to finish.

Make sure the following folders are generated:

Download the repository Heltec_ESP32 as zip and extract it to /Documents/Arduino/.

Plug in the heltec board and wait for the drivers to install (if needed).

Open the Arduino IDE, click on Tools->Boards and choose Wifi_LoRa_32_1.

Click on Sketch->Include Library->Add .Zip Libaries....

In the pop-up window, navigate to /Documents/Arduino/ and choose Heltec_ESP32-master.zip.

Make sure the chosen board is Wifi_LoRa_32.

Click on
File->Examples->(Example from Custom Libraries)->Heltec ESP32 Dev-Boards->OLED->SSD1306SimpleDemo.

Click the Upload button to upload the program to the board. Check the OLED display to see if it works.

Open Tools->Serial Monitor to see the printed messages. Make sure the baudrate is set to 115200. To reset the program, simply upload the program again or press the hardware reset button on the board.

Other examples are available within Heltec ESP32 Dev-Boards.

Click on Tools -> Manage Libraries... and search for VL53L0X. Choose and install the Adafruit_VL53L0X library by Adafruit.

Click on Tools -> Manage Libraries... and search for DHT. Choose and install the DHT sensor library by Adafruit.

The originial pinout diagram provided by Heltec can be accessed here. Below is a snapshot of the diagram. The pins used by the OLED module are fixed and are taken care of by the Heltec library.
The pins used by the LoRa module are fixed and must be explicitly defined in the code to properly interface with the LMIC library (see section 5.1.1).

The VL53L0X sensor uses I2C to communicates with the microcontroller, this case being the ESP32 microcontroller on the Heltec LoRa Board. The I2C bus consists of two lines: SCL for clock and SDA for data. More information on the working mechanism of the I2C bus can be found here.

The VL53L0X breakout board provides the following pinouts:

• VDD: positive supply voltage, to be connected to a power supply (2.6V to 3.5V)
• GND: ground
• SCL: clock line for I2C
• SDA: data line for I2C
• GPIO1: Interrupt output
• XSHUT: shutdown pin, active low. Driving this pin LOW will put the sensor to standby mode.

The wiring between the VL53L0X breakout board and the WIFI LoRa 32 (V1) board should be as in the figure below.

Note that the GPIO1 pin should be left unconnected as it is not used within the scope of this application.