[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
The current signal output by instruments and sensors is mostly 4-20mA. Why is it 4-20mA? Because 4-20mA sensors are mostly two-wire systems, that is, the signal line and the power line share two wires