I want to use an ESP-32 to read keypresses and show it on an OLED screen. I can't get it to detect keypresses

[richterlevania3]

I'm using the following code. The ESP32 goes on a loop printing gibberish and doesn't detect any keypresses. I'm using a Wroom32 with 38 pins.
I'm using diodes on the columns.

Code: Select all

#include <Arduino.h>

const int numRows = 4;
const int numCols = 12;

const byte rowPins[numRows] = {1, 3, 17, 4};
const byte colPins[numCols] = {16, 0, 2, 15, 13, 12, 14, 27, 26, 25, 33, 32};

char keyMap[numRows][numCols] = {
  {'\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '\b'},
  {'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', '\'', '\n'},
  {16, 'Z', 'X', 'C', 'V', 'B', 'N', 'M', ',', '.', '/', 16},
  {' '}
};

void setup() {
  Serial.begin(115200);

  for (int i = 0; i < numRows; i++) {
    pinMode(rowPins[i], OUTPUT);
    digitalWrite(rowPins[i], LOW);
  }

  for (int j = 0; j < numCols; j++) {
    pinMode(colPins[j], INPUT_PULLDOWN);
  }
}

void loop() {
  for (int row = 0; row < numRows; row++) {
    digitalWrite(rowPins[row], LOW); // Activate the current row
    for (int col = 0; col < numCols; col++) {
      if (digitalRead(colPins[col]) == HIGH) {
        char key = keyMap[row][col];
        if (key == '\t') {
          Serial.print("TAB");
        } else if (key == '\b') {
          Serial.print("BACKSPACE");
        } else if (key == '\n') {
          Serial.print("ENTER");
        } else if (key == 16) {
          Serial.print("SHIFT");
        } else if (key != ' ') {
          Serial.print(key); // Send the captured key to the serial console
        }
        delay(50); // Debounce delay
      }
    }
    digitalWrite(rowPins[row], HIGH); // Deactivate the row
  }
}

I'm at my wits end. Please help me.

[ESP_Sprite]

GPIO 1 is your TxD, that normally is the output from your serial port. If you're using that for your keyboard instead, you won't get sane serial output anymore.