PIC18f4520

[lihsheng]

hi i'm a noob here.. would any kind soul help mi answer or guide me thru these questions? your help will be greatly appreciated!

1.How many i/o interface pins between keypad (4x4) and PIC18f4520?

2.How to detect if a key is depressed?

3.How to identify which of the 16 keys was depressed (decode the key from the (4x4) matrix)?

4.What is the logic level sensed by PIC18f4520 when the touch sensor is pressed?

5.Anybody has guides on how to teach Keypad & Sensor to my students?


Thanks

 

[Gayan Soyza]

There was another recent thread about PIC & keypad Look over here.

https://www.electro-tech-online.com/threads/pic-keypad-im-newbie.33718/