Star 發表於 July 7, 2020
The transistor is often used as an input element. In the keyboard input, the diode is connected to different row buses and different column buses. The circuit scans the state of the logical combination of the keys on the keyboard at any time, such as what key is pressed at the same time, and it is better to execute .
Anneliese 發表於 July 7, 2020
At the same time, pull down the two ports to make a difference and reuse the ports.
Vienna 發表於 July 7, 2020
It should be port multiplexing.
