Keypad Integration

I found out that the Old code that I was using, had a problem when multiplexing. The Microprocessor would halt after 60 keys were pressed. So, in this video I will introduce you to a completely new method for scanning the keypad. However Adding displays and Multiplexing is pretty much the same. In this video we will program an AT89C51 using assembly language to scan a 4x4 matrix key pad and display which keys are pressed on two multiplexed 7 segment displays. The program that I am using to write code with is called Keil µVision 5. You can find and download it here: https://www.keil.com/download/product/​​​ As I an not the one who did the actual keypad programming, I will provide you with the link to the individual who actually did do that part of the programming, if you need further instruction on that part of the programming. Study Microcontrollers https://youtu.be/f2wra_y5EQw​

In this video we will program an AT89C51 using assembly language to scan a 4x4 matrix key pad and display which keys are pressed on two multiplexed 7 segment displays as well as add 4 more 7 segment displays to simulate incrementing address spaces up to FFFF in Hex. The program that I am using to write code with is called Keil µVision 5. You can find and download it here: https://www.keil.com/download/product...​ As I an not the one who did the actual keypad programming, I will provide you with the link to the individual who actually did do that part of the programming, if you need further instruction on that part of the programming. Study Microcontrollers https://youtu.be/f2wra_y5EQw

In this video we will program an AT89C51 to scan a 4x4 matrix key pad and display, which key is pressed on a 7 segment display. The program that I am using to write code with is called Keil µVision 5. You can find and download it here: https://www.keil.com/download/product/​ As I an not the one who did the actual programming, So, I will provide you with the link of the individual who actually did the programming, if you need further instruction on the programming aspect. Ponnambalam P https://youtu.be/1fO9azOVl5o

Keypad to 7 Segment Display using MM74C922 4x4 Matrix Decoder to 7447 BCD to 7 Segment Display Decoder

In this video we will program an EEPROM with the 7 segment display codes needed to display the correct HEX alphanumeric when pressed on the keypad.

4x4 Keypad Matrix using MM74C922 Decoder

Basic 4x4 Matrix Keypad explained

In this video we will program an AT89C51 to scan a 4x4 matrix key pad and display, which keys are pressed on two 7 segment displays. The program that I am using to write code with is called Keil µVision 5. You can find and download it here: https://www.keil.com/download/product/​ As I an not the one who did the actual keypad programming, I will provide you with the link of the individual who actually did do that programming, if you need further instruction on that part of the programming. Ponnambalam P https://youtu.be/1fO9azOVl5o