Thank you very much!

Here is the solution I finally use: Cheers,

Francis

Hello,

I am trying to connect a 3x4 keyboard using Keypad.h library example.

I wish to use GPIO 26, 25, 33, 32, 35, 34, 39 as input.

I put 10k pull-up resistors for GPIO 35, 34 and 39.

I have to use code as follow:

byte rowPins[ROWS] = {R1, R2, R3, R4};
byte colPins[COLS] = {C1, C2, C3 ...

I changed ESP32 board and used shorter wires. Then the problem got solved!

Hello everyone!

I am trying to connect my ST7735 to my esp32 devkit v1 via HSPI pins.
Unfortunatly, I can't make it work.

My code:

#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
#include <SPI.h>

#define TFT_CS 15
#define TFT_DC 2
#define TFT_RST 4
#define TFT_MOSI 13
#define TFT_SCLK ...