User Manual

Code Explanation

static volatile int globalCounter = 0 ; // a static integer variable to store the pulse

count

void exInt0_ISR(void) { //GPIO0 interrupt service routine

++globalCounter;

}

wiringPiISR(Pin0, INT_EDGE_FALLING, &exInt0_ISR); // set an interrupt here and the

signal is falling edge for Pin 0. When the interrupt happens, execute the function

exInt0_ISR(), and the pulse count will add 1.

while(1){ // if no interrupt happens, the pulse count will stay and just print it.

printf("Current pulse number is : %d\n", globalCounter);

}

For Python users:

Step 2: Get into the folder of the code.

cd /home/pi/SunFounder_Super_Kit_V3.0_for_Raspberry_Pi/Python

Step 3: Run

sudo python 09_ne555.py

Now you can see the number of square waves printed. Spin the potentiometer and the value

will decrease or increase.

SunFounder