Tentuts-Meritox

Hello friends, in this tutorial we are going to interface LCD with 8051 microcontroller but in 4 bit mode. we already interfaced LCD with 8051 in 8 bit and also done scrolling of text in previous tutorials.

Knowledge of sensors are very essential part of robotics.And IR sensor  is very useful if you are tying to make a obstacle avoider robot or a line follower. In this post we are going to make a simple IR sensor which can detect a object around 6-7 cm. or you can change range of sensor to 1-2 cm if you are using for line follower.

In this tutorial i am going to show you how to setup your project  in Keil for 8051 (AT89s51) to simulate and debug your code. This is one of the most important tutorial for beginner who just start learning 8051. Because Keil is the best IDE to compile,debug and simulate your program.  And most of 8051 programmer you this tool so you get lot of help about this on internet. In this tutorial i use Keil v4.0 but it is same for all version or you can download lates trail version from here

Multiplexing is very essential part while working with 8051 because of its limited number of ports. which offer 32 pins for connecting external devices. 32 seems large but when you working with seven segment, keypad, LCD, ADC etc. or if you project have many parts to operate simultaneously then you definitely need to multiplex some of ports.

In our last tutorial we interface 2x16 LCD with 8051 in assembly, now lets display some scrolling text on LCD. it is very useful because generally we have a long text to display and a 2x16 LCD display only 16 character at a time.

In many projects circuits IC's CD4017, CD4026, CD4026 CD4511 etc are used. they all are comes under 4000 ICs series which is a CMOS (complimentary metal oxide semiconductor) based ICs. it is widely used in instruments, projects.. because it have low power consumption (µW) , drive up to 50 CMOS, 74HC, 74HTC inputs and operated between 3 to 15V power supply range.some most common ICs are listed here with pin diagram and description and their uses.

counters are used in most of all digital devices like digital clock, camera, CD/DVD recorder, mobiles etc. to count sequence in the form of pulse. and many project required a counter for counting sequence according to need of project. So in this part we are going to make a Decade Counter using CD4017 IC

Liquid Crystal Display also called as LCD is very helpful in providing user interface as well as for debugging purpose. The most common type of LCD controller is HITACHI 44780 which provides a simple interface between the controller & an LCD.  

Multisim is best simulator for electronics circuits and MCU devices with high accuracy. but there is a problem for microcontroller with mutisim, that is they  not give any user manual for 8051 with c language. this post give a basic idea how to use c language in multisim for 805x mcu devices.