Wifi Kit 32 Display

#1

Hello,
I’m trying to create an application for the heltec Wifi kit 32 using the esp-idf framework.
I want to use the integrated display to show some information during run time but I haven’t been able to make it display something.
I’m using the u8g2 library and the HAL from nkolban.
I executed the i2c scanner sketch example to discover the address of the display and i found out it is 0x3C.
I saw the display list in this forum and I assumed in this board there is a ssd1306 i2c 128*64 display.

I tried to turn on the integrated LED at the and of the execution of my program but it won’t light up
So I tried to move the instruction to turn on the LED towards the start of my program and I discovered that my program stops at the u8g2_InitDisplay(&u8g2) instruction.

My project is available on github https://github.com/ilofX/CarLed.git
Is there anyone who encountered the same problem?

#2

In the Arduino sketch environment, this is what I am using

// for Heltec ESP32 displays
U8G2_SSD1306_128X64_NONAME_F_HW_I2C display(U8G2_R0, 16, 15, 4);

For the Kit 8 ( not the ESP32)

// Heltec small display - All Boards without Reset of the Display;
U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C display(U8G2_R0, 16, 5, 4);

1 Like
#3

Thanks for you reply, I tried in Arduino and it works, but I’m using the ESP-IDF framework and that functions aren’t available.
I tried changing the display type in my code but nothing changed.

#4

Thank you very much

For Wifi Kit 32 board (ESP32) add “U8g2” library to your Arduino project (current version is 2.26.14) and use the following:

U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, 16, 15, 4);

#5

I got it working with Arduino, but I was trying to get the display working using the ESP-IDF framework not the Arduino one.
Is there anyone with programming experience with espressif ESP-IDF framework?

#6

I tried this approach, however I found


#include “Heltec.h”
was much easier to push text to screen and handles xbm files easily
see examples for functions