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Linkerkit Button Module

Linkerkit button module uses a nice big tactile switch which is mounted on a small circuit board along with the pull up resistor making it ready to plug into the Linkerkit base board and onto your Arduino or pcDuino via some ribbon cable.

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Manufacturer: Linksprite

Description: Button module for use with the Linkerkit sheild for Arduino and pcDuino.

Sample  Arduino Code:

const int ButtonPin=9;

void setup()


  pinMode(ButtonPin, INPUT);

  Serial.begin(9600);   // init serial to 9600b/s


void loop()


  int sensorValue = digitalRead(ButtonPin);











Example pcDuino C/C++ code to take input from switch and turn on LED

// Connect switch to pin 2 and an LED to pin 3. Press button and LED
// lights for 2 seconds and turns off.

#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

// some defines which you can put into a .h file
#define GPIO_MODE_PATH "/sys/devices/virtual/misc/gpio/mode/"
#define GPIO_PIN_PATH "/sys/devices/virtual/misc/gpio/pin/"
#define GPIO_FILENAME "gpio"
#define HIGH '1'
#define LOW  '0'
#define INPUT  '0'
#define OUTPUT '1'
#define INPUT_PU '8'

// There are 18 IO pins, so declare file descriptors for all 18
int pinMode[18];
int pinData[18];

void writePin(int fileID, int value);

int main(void)
        char inputBuf = HIGH;
        char path[256];

        // Initialise the file descriptors for pin 2 & 3 mode and data files
        for (int i = 2; i <= 3; i++)
                memset(path,0,sizeof(path)); // clear the path variable
                // Create path for pin mode file
                sprintf(path, "%s%s%d", GPIO_MODE_PATH, GPIO_FILENAME, i);
                pinMode[i] = open(path, O_RDWR);  // set pin mode
                memset(path, 0, sizeof(path)); // clear the path variable
                // Create path for the pin data file
                sprintf(path, "%s%s%d", GPIO_PIN_PATH, GPIO_FILENAME, i);
                pinData[i] = open(path, O_RDWR); // set pin data

        writePin(pinMode[3], OUTPUT); // set as output
        writePin(pinData[3], LOW); // and write a LOW (0) to pin
        writePin(pinMode[2], INPUT_PU); // set pin 2 as input

        // Lets wait for pin 2 to go high (switch pressed)
                lseek(pinData[2], 0, SEEK_SET); // set to begining of file
                // first byte is the interesting one so read it
                read(pinData[2], &inputBuf, 1);
                usleep(100000); // 0.1sec sleep
        } while (inputBuf == HIGH);
        // set pin 3 high for 2 seconds then low again
        writePin(pinData[3], HIGH);
        // now turn pin 3 off (LOW)
        writePin(pinData[3], LOW);

void writePin(int fileID, int value)
  char buf[4];  // Need to write 4 bytes for it to work.
  memset((void *)buf, 0, sizeof(buf)); // clear the buffer out.
  sprintf(buf, "%c", value);  // create buffer to write
  lseek(fileID, 0, SEEK_SET);   // set to top of the file
  write(fileID, buf, sizeof(buf));  // and write.

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