[size=5] Five years ago, AVR microcontrollers were the most popular microcontrollers for microcontroller enthusiasts. Why? Because AVR microcontroller emulators and programmers are very easy to DIY, w
[font=Verdana]Use INT0 interrupt, count with a key (i.e. press the key once, interrupt once, number increases by 1), and then complete different tasks according to the value of the counter. But someti