program keypad 4x3 for pic16f877a using ldmicro (by Mazlan)
I facing a problem on creating program fpr pic 16f877a, how keypad 4x3 can be program. The project is digital lock.
(no subject) (by Max)
Do you mean (how to scan a 4x3 matrix keypad)
If answer is yes, then the easiest way will be to supply 3 different voltage to the column wire... and read on 4 analog input the voltage of the 4 line wire
column #1 = 1 volt
column #2 = 2.5 volts
column #3 = 5 volts
So if you read between (450 and 560) 2.5V on analog line #1, you know that the key #2 has been pressed
and if you read more than (900) 5V on analog line #1, this is key #3
Hope this help
matrix keypad prog (by SEGAR)
hi, i wanna make programming with matrix keypad use password for operation any output ,but i don't have any idea for it, please if have any one done this programming in ldmicro please help to upload some information.