## Arduino drives 5 button keyboard ## 5 button keyboard: the use of series resistor and switch to determine the various voltage to be sent to a Arduino analog input.You can use the same technology to install multiple buttons in other ways or directions. ## 5 button keyboards CODE ##

#define keyboard_AnalogInput 5

#define btRIGHT  0
#define btUP     1
#define btDOWN   2
#define btLEFT   3
#define btENTER 4
#define NONE   5

int ad_keyd = 0;
int buttonPressed;

void setup()   
    {
  Serial.begin(9600);
  Serial.println("5 button keyboards");
     }

void loop()  
{
  buttonPressed = read_keyboard();
  if (buttonPressed != NONE)
  { 
     Serial.print("OK easyeda pressed ");
    Serial.println(buttonPressed, DEC);
    } 
  delay(500);
}
// read the buttons
int read_keyboard()
{
   ad_keyd = analogRead(keyboard_AnalogInput); 
  // these values: 0, 144, 329, 504, 741
  if (adc_key_in > 1000) return NONE; 
  if (adc_key_in