April 16th, 2008 PIC16F877 and 4×5 keypad
The circuit here described is a simple 4×5 keypad that can be used in particular with the PIC 16F877 microcontroller, for which it has been designed considering a supply of 5V, 16F877 I/O pins leakage current, the voltage level recognized as a high or low state while in TTL or ST mode, etc.. Since this circuit is quite simple, and the resistors’ value not critical, it should be suitable for other PICs and other microcontrollers, too.
PIC16F877 and 4×5 keypad: [Link]
April 24th, 2008 at 9:27 am
[...] The circuit here described is a simple 4×5 keypad that can be used in particular with the PIC 16F877 microcontroller, for which it has been designed considering a supply of 5V, 16F877 I/O pins leakage current, the voltage level recognized as a high or low state while in TTL or ST mode, etc.. Since this circuit is quite simple, and the resistors’ value not critical, it should be suitable for other PICs and other microcontrollers, too. [via] [...]
May 30th, 2008 at 7:05 pm
please kindly send your support how i can connect or interface key pad 4×4 with PIC16F877 with assemble program.
May 30th, 2008 at 10:04 pm
if you follow the link provided at the end of the article you’ll find every bit of information you’ll need