Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Design a calculator that can key in complex number.

Status
Not open for further replies.
Hi All Expert!!

I want to design a calculator that can key in complex number..

I want to know how to connect 4x4 Matrix Keypad and MM74C992 16 Key Encoder on PIC18F4520 microchip..

Your help is very much appreciated..

:)
 
Hi All Expert!!

I want to design a calculator that can key in complex number..

I want to know how to connect 4x4 Matrix Keypad and MM74C992 16 Key Encoder on PIC18F4520 microchip..

Your help is very much appreciated..

:)

hi,
Connections drawing.
If you require the 74C922 output to hold the data, remove the invertor and connect the /OE to 0V.
 

Attachments

  • esp01 May. 24.gif
    esp01 May. 24.gif
    13 KB · Views: 413
It seems a complete waste to use the keypad encoder, why not just connect the keypad directly to the PIC? - it's 8 I/O pins as opposed to 5 I/O pins, but that's probably not a problem anyway.
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top