Keypad Interfacing With 8051 Pdf
A keypad is an organized matrix of switches in rows and columns and it comes in the various form like numeric keypad, alphanumeric keypad. It also comes in different size like 4×3, 4×4 etc. In real life, the keypad has a lot of application like, calculator, electronic lock, mobile phone and many more electronic appliances.In this article, we will learn the interfacing of the keypad with 8051 micro-controller. Note: Numeric keypad contains mostly numeric numbers. Connection of keypad with 8051 microcontroller In below image, I have described the connection of keypad with 8051 microcontrollers. Here I have connected the column and rows of keypad corresponding to lower nibble of port-2 and the upper nibble of port-2. Algorithm to write a sample program for Keypad Interfacing Here we will create an interface between 8051 microcontrollers and a 4×3 numeric keypad. Here I am not considering the switch debouncing.
Anastasia Steele si Christian Grey au acum totul: dragoste, pasiune, intimitate, bogatie si o multime de posibilitati privind viitorul lor. Insa Ana stie ca nu va fi usor sa traiasca alaturi de Fifty Shades. 50 de umbre ale lui grey vol 3 online subtitrat. A fi impreuna este o provocare plina de neprevazut.
Keypad Interfacing With 8051 Assembly Code Pdf
Keypad Interfacing With 8051 Pdf Free
There are following steps to write a program for keypad INTERFACING • Firstly you have to connect pin of rows and columns of the keypad with microcontroller pins and make the row pins as output and column pins as input. NOTE: Whenever in keypad any of the keys pressed then corresponding row and column get connected and status of the row will be reflected in the corresponding column. • Make all row pins high except the row1 pin and check the status of col1,col2, and col3. If anyone of them become low i.e. Any one of the keys pressed in row1.