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8051 Interface – Keypad

 

 

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Keypad is a widely used input device with lot of applications such as telephone, computer, ATM, electronic lock etc. A keypad is used to take input from the user for further processing. Here a 4 by 3 matrix keypad consisting of switches arranged in rows and columns is interfaced to the microcontroller. A 16 by 2 LCD is also interfaced for displaying the output. The interfacing concept of keypad is very simple. Every number of keypad is assigned two unique parameters that are row and column (R, C). Hence every time a key is pressed the number is identifying by detecting the row and column numbers of keypad.

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8051 Tutorials – 10hz Square wave generator using Timer

 

 

                            This tutorial you can learn 10hz Square wave generator using Timer using micro controller. I chooses AT89S51 micro controller(You can select any other keil support micro controller) and demonstrated, this is very simple and follow this below steps,

Required software

 

Required components and Programmer

  • 1x AT89S51 Controller
  • 1x 4Mhz Crystal
  • 2x 22pf capacitor
  • ISP AVR USB programmer

 

C code

 

 



 

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