thank you, guys, you are right. the hardware is ESP32 devkitC (ESP32-WROVER-IE), so pin16,17 is reserved for internal use, I forgot this one. thank you again.

I'm trying to test keypad with ESP32. the keypad is 4*4, I tried some of combination of pin setting, some of combination works but some fails. #include <Wire.h> #include <Keypad.h> const byte ROWS = 4; const byte COLS = 4; char keys[ROWS][COLS] = { {'1','2','3','A',}, {'4','5','6','B',}, {'7','8','9...

thank you very much, that is extactly what I want. more ever, could you share where it from?

hi all, could any body share where is offical detailed pinout of ESP32 dev board (not of chip pinout, nor module pinout) from esp32, the kind of definition of every pin, not a brief like https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/esp32/get-started-devkitc.html#functiona...

我是新学者，购买的开发板是ESP32-DevKitC，搭载的模组是ESP32-WROVER-IE（集成芯片是ESP32-D0WD-V3）。
尝试使用ardunio IDE，在IDE中的开发板中“ESP32 Ardunio”中有很多，我应该选择哪一个呢？
猜测是不是应该是“ESP32 Wrover Module”

谢谢。