mythrikalam
Newbie level 6
can anyone suggest me how to interface the 8x4 matrix keypad with atmega.
if anyone had any suggestable program kindly pass it to me....
if anyone had any suggestable program kindly pass it to me....
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8x4 keypad will require atleast 12 i/o lines of the controller. Considering the fact that atmega series have 8 bit micro controllers and correspondingly the i/o ports are 8 bit wide. Hence the program will be some what lengthy but not complicated. Refer to the mazidi book of AVR micro controllers. It has got an example of interfacing 4x4 matrix keypad. Your case is just and extension of that example.
Ok, so now its the trouble shooting time. There are plenty of things to check if all the silly mistakes are accounted for but I ll get you started. Before that, I need to know, whats your output i.e. how do you know that button presses are not being recognized by the controller??