attachInterrupt to pin7

[kd-chicago]

Code uses digital pin 7 to attach interrupt: arduino UNO can only use pins 2 & 3 for this interrupts;
other pins can be assigned as interrupt source through PCINT

Also, keep in mind MAX7219 controller board with SMD chip is missing filter capacitor, so it will only work well at the minimal intensity settings. One has to solder 10-100uF capacitor between controller VCC and GND to make it work consistently.

[sani2025]

Hello Sir
Please help me regarding this issue
#include "Delay.h"
^~~~~~~~~
compilation terminated.
exit status 1

Compilation error: Delay.h: No such file or directory

I'm already downloaded all types of library file in arduino app
how fix it please suggest me

[kd-chicago]

Place Delay.cpp and Delay.h in the same folder with your sketch;
Make sure in the code there is a line at the beginning
#include "Delay.h"
pay attention it must contain double quotes