Introduction
Infrared (IR) remote control systems are widely used in consumer electronics such as televisions, DVD players, and air conditioners. In this project, we will design an IR remote control system using the 8051 microcontroller. The system will be able to receive IR signals from a remote and perform corresponding actions.
Components Required
8051 Microcontroller (e.g., AT89S52)
TSOP1738 IR Receiver
IR Remote (e.g., a TV remote)
16x2 LCD Display (optional for displaying commands)
Resistors (10kΩ, 1kΩ)
Capacitors (33pF, 100μF)
Crystal Oscillator (11.0592 MHz)
Breadboard and Connecting Wires
Power Supply (5V)
LEDs (for visual indication)
Circuit Diagram
The IR receiver TSOP1738 is connected to the 8051 microcontroller. The received IR signals are processed by the microcontroller to perform actions such as turning on/off an LED.
+5V ----- +5V | | TSOP1738 +---+ +5V --|VCC| | | |OUT |------- P3.2 (8051) | | GND --|GND | +---+Pin Connections
TSOP1738 IR Receiver:
VCC to +5V
GND to Ground
OUT to P3.2 of 8051
LEDs:
Connect LEDs to P1.0-P1.3 with 1kΩ resistors in series
LCD (Optional):
RS to P3.6 of 8051
RW to Ground
E to P3.7 of 8051
D4-D7 to P2.4-P2.7 of 8051
Software Implementation
The code is written in C using Keil uVision IDE. It involves configuring the 8051 to receive IR signals from the TSOP1738 and decode them.
#include <reg51.h>#include "lcd.h"sbit IR_RECEIVER = P3^2; // IR receiver pinvoid delay(unsigned int count) { int i,j; for(i=0;i<count;i++) for(j=0;j<1275;j++);}unsigned char receive_IR() { unsigned char ir_data = 0x00; unsigned char i; for (i = 0; i < 8; i++) { while(IR_RECEIVER == 0); // Wait for high delay(1); // Small delay if (IR_RECEIVER == 1) { ir_data |= (0x01 << i); // Store bit } while(IR_RECEIVER == 1); // Wait for low } return ir_data;}void main() { unsigned char ir_code; lcd_init(); // Initialize LCD (optional) while(1) { ir_code = receive_IR(); // Receive IR code lcd_cmd(0x80); // Move cursor to first line lcd_write_string("IR Code: "); lcd_write_char(ir_code); // Display IR code // Perform action based on IR code switch(ir_code) { case 0x10: P1_0 = ~P1_0; // Toggle LED1 break; case 0x20: P1_1 = ~P1_1; // Toggle LED2 break; case 0x30: P1_2 = ~P1_2; // Toggle LED3 break; case 0x40: P1_3 = ~P1_3; // Toggle LED4 break; default: break; } delay(1000); // Small delay for debouncing }}Explanation
Initialization:
LCD Initialization: The lcd_init() function sets up the LCD (optional).
Receiving IR Signals:
The receive_IR() function reads the IR signal bit by bit and reconstructs the 8-bit code. It waits for the IR receiver to go high, reads the bit, and then waits for it to go low.
Performing Actions:
The main loop continuously receives IR codes and displays them on the LCD.
Based on the received IR code, the program toggles corresponding LEDs.
Conclusion
This project demonstrates the use of the 8051 microcontroller to create an IR remote control system. The system can receive IR signals from a remote, decode them, and perform corresponding actions such as toggling LEDs. This project is a great way to learn about IR communication, sensor interfacing, and using microcontrollers for remote control applications.
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