ESP32 Forum

Posted: **Sat Feb 27, 2021 8:52 am**

Hello everybody,

I have a problem with my codes.
I need a BLE keyboard with 4 keys: N key, K key, right arrow key, left arrow key.

I found two codes but:
- in one code the arrow keys work but not the letters.
- In the second code it is exactly the other way around, the letters but the arrow keys don't work.

these four things should each be controlled with a push button.

does anyone have an idea?

Thank you

Code with working Arrows, but when i add or change KEY_ARROW_RIGHT to maybe KEY_N it does not work:

Code: Select all

#include <BleKeyboard.h>
#include <driver/adc.h>

BleKeyboard bleKeyboard;

//both pins are pulled low via external resistor
#define leftButton 32
#define rightButton 33

void setup() {
  adc_power_off();
  Serial.begin(115200);
  bleKeyboard.begin();
  pinMode(leftButton, INPUT);
  pinMode(rightButton, INPUT);
  Serial.print("Connecting...");
  while(!bleKeyboard.isConnected());
  Serial.println("Connected");
}

void loop() {
  while(bleKeyboard.isConnected()) {
    if(digitalRead(leftButton)) {
      bleKeyboard.press(KEY_LEFT_ARROW);
      bleKeyboard.releaseAll();
      delay(1000); //debouncing
    }
    if(digitalRead(rightButton)) {
      bleKeyboard.press(KEY_RIGHT_ARROW);
      bleKeyboard.releaseAll();
      delay(1000);
    }
    delay(10);
  }
  delay(1000);

second code, if i set "KEY_LEFT_ARROW" i get only a W if i push the button:

Code: Select all

#include <BleKeyboard.h>
//Se the name of the bluetooth keyboard (that shows up in the bluetooth menu of your device)
BleKeyboard bleKeyboard("Franzi-Buttons");
byte buttonPins[] =    {23,  22,   21,   19,   18};
char buttonChars[] =  {'n', 'k',  'KEY_LEFT_ARROW', '2',  'e'};
boolean buttonStates[] = {false, false, false, false, false};
//Set the old button state to be LOW/false; which means not pressed
boolean oldPinState = LOW;

void setup() {
  
  //Start the Serial communication (with the computer at 115200 bits per second)
  Serial.begin(115200);
  //Send this message to the computer
  Serial.println("Starting BLE work!");
  //Begin the BLE keyboard/start advertising the keyboard (so phones can find it)
  bleKeyboard.begin();
  //Make the button pin an INPUT_PULLUP pin, which means that it is normally HIGH, untill it is pressed/ connected to the GND/0V
  for(int i=0;i<sizeof(buttonPins);i++){
    pinMode(buttonPins[i], INPUT_PULLUP);
    
    }
}

void loop() {

  if (bleKeyboard.isConnected()) {
    for(int i=0;i<sizeof(buttonPins);i++){
      boolean state = digitalRead(buttonPins[i]);
      if (state != buttonStates[i]){
        if (state == LOW){
          bleKeyboard.press(buttonChars[i]);
          }else{
            bleKeyboard.release(buttonChars[i]);
            }
            buttonStates[i] = state;
        }
    }
  }
}