10 DB UNO MEGA2560 példakóddal! 3.3V 5V 4 gomb 1 Analóg kimenet AD billentyűzet billentyűzet gomb Arduinohoz
10PCS with UNO MEGA2560 example Code ! 3.3V 5V 4 Buttons 1 Analog output AD Keypad keyboard button for Arduino
Product Name:10PCS with UNO MEGA2560 example Code ! 3.3V 5V 4 Buttons 1 Analog output AD Keypad keyboard button for Arduiuo
Packing list:
10 p cs 4 key Analog Buttons( With Pin Header )
  Description:
1 Power Supply Voltage : 3-5V
2 4 Buttons 1 Analog Output(AD Pin)
3 PCB Size : 30x12mm
4 Weight : 1.8g
  
Ideal for linking up to your Ardiuno UNO Mini Nano Mega2560 etc,or others MCU ( AVR STM32 ARM7 ARM9 ARM10 PIC AT89C51 STC MSP430 FPGA CPLD raspberry pi etc.) 
 
 
 
  
 
 
Circuit schematics : 
 
Connection with Arduiuo UNO :
 
Arduiuo uno/mega2560 Code  
//******************************************************//
 
/*
  Arduiuo_4 key analog Buttons
 
  This example code is in the public domain.
 */
 
#define key1ValueMin     96
#define key1ValueMax     106
#define key2ValueMin     144
#define key2ValueMax     159
#define key3ValueMin     193
#define key3ValueMax     213
#define key4ValueMin     242
#define key4ValueMax     255
  
int adPin = A0;    // select the input pin for the potentiometer
int keyValue;
int keyValue_r;
int keyValue_rr;
  
//key scan
int key_scan(void)
{
   int adValue;
   int key;
   
   adValue = analogRead(adPin);//read ad Value
  
  adValue = adValue / 4;
  
  if(adValue >= key1ValueMin && adValue <= key1ValueMax)// k1
  {
    key = 1;
  }
  else if(adValue >= key2ValueMin && adValue <= key2ValueMax)// k2
  {
    key = 2;
  }
  else if(adValue >= key3ValueMin && adValue <= key3ValueMax)// k3
  {
    key = 3;
  }
  else if(adValue >= key4ValueMin)// k4
  {
    key = 4;
  }
  else //Invalid value
  {
    key = 0; 
  }
  
  return key;
  
}
void setup() {
  
   Serial.begin(9600);
}
 
void loop() {
 
  //Save three key scan value
  keyValue_rr = keyValue_r;
  keyValue_r = keyValue;
  keyValue = key_scan();
  
  //Three scanned values are the same, indicating that key is valid
  if(keyValue > 0 && keyValue==keyValue_r && keyValue_r==keyValue_rr)
  {
   Serial.print(''keyValue = '');
    Serial.println(keyValue);
  }
  
  delay(100); //Each scan interval 100-200MS       
 
}
 
//******************************************************// 
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