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KC11C04 AD Key Keyboard Button Analog Switch Board Module Arduino raspberry pi A

KC11C04 AD Key Keyboard Button Analog Switch Board Module Arduino raspberry pi A

KC11C04

1000 in stock

$3.48
$3.48 $3.48
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Product Name: AD Key Keyboard Button Analog Switch Board Module for Arduino raspberry pi ARM Kit

       
Module No.: KC11C04
  
 Packing list:
 
1 pcs 4 key AD Keyboard

Description:

   
1 Power Supply Voltage : 2-5V
2 4 Buttons 1 Analog Output(AD Pin)
3 PCB Size : 30x12mm
4 Weight : 1.5g
 
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 etc.)

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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