Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

This is my Proteus project connected to 16f877a MCU with keypad

Status
Not open for further replies.
PA3040

PA3040

Advanced Member level 3
Joined
Aug 1, 2011
Messages
883
Helped
43
Reputation
88
Reaction score
43
Trophy points
1,308
Activity points
6,936
keypad.JPGDear All
Please see picture
This is my Proteus project connected to 16f877a MCU with keypad. when I press the key the result put to the portc
please advice, is this cct is correct?. meanwhile please send me a sample ASM code for this cct to understand the operation of keypad.
Thanks
 
Last edited:

PA3040 said:
Dear All
Please see picture
This is my Proteus project connected to 16f877a MCU with keypad. when I press the key the result put to the portc
please advice, is this cct is correct?. meanwhile please send me a sample ASM code for this cct to understand the operation of keypad.
Thanks
Click to expand...
Where is the picture?

---------- Post added at 21:42 ---------- Previous post was at 21:06 ----------

See https://www.edaboard.com/threads/191625/#post802105

Not tested by me

---------- Post added at 21:45 ---------- Previous post was at 21:42 ----------

The logic is :-
Make 4 pin as input and 4 pin as out put.


1. Make a input as high.
2.scan 4 o/p pins continuously if any of them as high read the particular key.

So make changes in the code given in the above link.

---------- Post added at 21:50 ---------- Previous post was at 21:45 ----------

///////////////////////////////////////
View the technical report:
http:/blog.iplussoft.com/pic_keypad_lcd.pdf

Download the assembly source file (.asm):
http:/blog.iplussoft.com/asm_pic_lcdkeypad.zip

Visit the official project site:
**broken link removed**
 
  • Like
Reactions: PA3040

    PA3040

    PA3040

    Points: 2
    Helpful Answer Positive Rating
PA3040 said:
View attachment 70831Dear All
Please see picture
This is my Proteus project connected to 16f877a MCU with keypad. when I press the key the result put to the portc
please advice, is this cct is correct?. meanwhile please send me a sample ASM code for this cct to understand the operation of keypad.
Thanks
Click to expand...

As far as hardware connections go, there isn't much to say. Since, it all really depends on the code. The keypad connection is correct, but the code must use the connection as shown. You should use resistors for the LEDs, between the port pins and the LED anodes. For simulation, you should use "active" LEDs, not just "device" ones. Go to the window, where you select parts (p on keyboard). Type in LED. 2 places below the default selected part are the "active" LEDs for simulation.

Hope this helps.
Tahmid.
 
  • Like
Reactions: PA3040

    PA3040

    PA3040

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top