I am using FlowCode to program an ESP32-Wroom, simply put a 3x4 keypad and a display. The keypad is connected like this:-

byte pin_rows[ROW_NUM] = {19, 18, 5, 17}; // GPIO19, GPIO18, GPIO5, GPIO17 connect to the row pins
byte pin_column[COLUMN_NUM] = {16, 4, 0};

An arduino sketch proves the ...