Scanning 6 button keyboard

[galina_simeonova]

Hi, I have to scan 6 button analog keyboard in Assembler for PIC 16f84a. Can somebody helps me because i have no idea how to make it ?

 

[milind.a.kulkarni]

refer this -

**broken link removed**
https://www.edaboard.com/threads/93979/

2x16 LCD and 4x4 keypad example

Good Luck

 

[galina_simeonova]

thanks, i' ll take a look

 

[betwixt]

Can you be more specific about the *analog* nature of the keyboard please. Are you implying it produces a different voltage as each key is pressed? If that is the case, the 16F84A is not a good choice of micro because it does't have an ADC on-board. There are still ways to do it though but give more information first.

Brian.

 

[galina_simeonova]

I mean that keyboard produces different voltage by press each key and about the controller i can use 16F877, too. Have an idea about checking if the key is pressed but i don't know how to initialized banks, addresshigh, addresslow and how to use it. The other thing i don't know is how to read voltage by keys, how microcontroller recognize it ?

---------- Post added at 15:12 ---------- Previous post was at 15:11 ----------

Sorry, I'm new and my questions are stuped but that's my course project.

 

[bjuric]

Check this to get some idea on bank management
Memory Arrangement

This will give you some start on MCU internals
PIC16F87x Mini Tutorial

A little on ADC
Analogue Inputs