30-03-2011, 03:59 PM
Presented by:
ANKITA JAIN
DEEPAK JAIN
[attachment=11354]
“Design and Development of 89C51 Microcontroller Based Infrared Remote Control system for Audio Amplifier”
Introduction
It consist of two sections:the receiving section and the transmitting section.
The receiving section consists of an Infrared remote.
In this project I’m using a Sony Infrared remote.
Whenever a key is pressed on the remote a coded pulse train is emitted. The pattern of the pulse train depends on the key pressed.
The transmitting section consists of the 89c2051 microcontroller.
The microcontroller is programmed so as to decode the incoming coded pulse train which is sensed by an infrared sensor (TSOP1238).
Once the coded pulse train is received it is decoded to recognize the corresponding amplifier for which the key is pressed and the necessary action is taken.
The analog multiplexer then select the corresponding keys for increasing or decreasing the volume of audio amplifier.
Block Diagram
Circuit Diagram
• TSOP
TSOP12.. is the standard IR remote control receiver series, supporting all major transmission codes
Pin Configuration
• Pin 1: ground
• Pin 2: output
• Pin 3: supply voltage
Photo detector and preamplifier in one package
TTL and CMOS compatibili
Output active low
Low power consumption
Lead (Pb)-free component
Improved immunity against ambient light
Output of DSO
Digital potentiometer
A digital potentiometer is a digitally-controlled electronic component that mimics the analog functions of a potentiometer.
. It is either built using an R-2R integrated circuit or a Digital-to-analog converter.
A digital potentiometer is an electronic component that is often controlled by digital protocols like I²C and SPI, as well as more basic Up/Down protocols.
Some typical uses of digital potentiometers are in circuits requiring gain control of amplifiers (frequently instrumentation amplifiers), small-signal audio-balancing, and offset adjustment.
Some Digipots come with non-volatile memory, so that they retain their last programmed position after they have been power cycled. Most, though, are volatile, i.e. after they are power cycled they will default to a standard value, which is usually the mid-point.
HARDWARE DEVELOPMENT
89c2051 microcontrolle
Infrared remote
Infrared sensor (TSOP1238)
MAX 232
Resistances: 3x 4.7K
Capacitances: 2x 22pf, 1x 220uf
Crystal Oscillator
FOR 5V POWER SUPPLY CIRCUIT
12-0-12 transformer
2 X 1N4007 (diodes)
2 X 1000uf capacitances
LM7805 voltage regulator
SOFTWARE DEVELOPMENT
Requirements:
Any operating system supporting web browsing like Windows 95, 98, 2000, XP, NT, Linux etc.
Visual basics – for coding and developing.
Web browsers like internet explorer, Mozilla firefox , opera etc.