Hi all ,
i want to use a keypad with a microcontroller , what kind of keypads should i use , and where can i find them ?
can i for example use telephone keypads or they r diffrent ?
how many ports on the microcontroller will the keypad use ?
Regards .
You can use one port (8bits) of you uController to produce your keypad. Make a Matrix contruction and multiply the number of lines by colluns used in design. This determine the maximun number of keys you can do with this ports.
Check the manufacturer application notes. I think everyone has one about thes subject.
Maybe instead of thinking about a keypad you should look at a PC keyboard ..
It is so easy to connect one to a microcontroller: all what you need is two microcontroller pins - one for DATA and one for CLOCK ..
Of course, you need to connect 0V and 5V to a keyboard, but it is like stating the obvious ..
Thanks for your replies guys , i think i'm gonna build my own , but IanP's idea is fascinating , DO u think IanP , that the 16F84 can handle it , and if yes , will the code writter to the controller be complicated ?
Regards .