This project uses a PIC16F877A microcontroller to control a curtain system based on ambient light levels. The system employs two IR sensors to detect curtain positions and an LDR sensor to measure light intensity.
- PIC16F877A Microcontroller
- L293D Motor Driver
- IR Sensors (2x)
- LDR Sensor
- Motor
- LCD Display
Refer to the provided circuit diagram for wiring instructions.
- IR_TOP: RB0 (Pin 21)
- IR_BOTTOM: RB1 (Pin 22)
- Motor Control Pins: RD6 (Pin 15), RD7 (Pin 16)
- LDR Sensor: AN0 (RA0, Pin 2)
- LCD: Connected to PORTD (RD0 - RD5)
- Connect the IR sensors to RD0 and RD1.
- Connect the motor control pins to RD6 and RD7.
- Connect the LDR sensor to AN0 (RA0).
- Connect the LCD to PORTD (RB0 - RB5).
- Ensure the PIC16F877A is properly powered and connected.
- The system reads the light intensity using the LDR sensor.
- If the light intensity is above a certain threshold, the curtain opens.
- If the light intensity is below the threshold, the curtain closes.
- The IR sensors ensure the curtain stops at the desired positions.
read_ldr(): Reads the light intensity from the LDR sensor and returns the value.stopMotor(): Stops the motor.openCurtain(): Opens the curtain until the top IR sensor is triggered.closeCurtain(): Closes the curtain until the bottom IR sensor is triggered.setup(): Initializes the I/O pins and stops the motor.main(): Main loop that continuously reads the light sensor and controls the curtain.
- Compile the provided code using MikroC Pro for PIC.
- Upload the compiled hex file to the PIC16F877A microcontroller.
- Power the circuit and observe the automatic curtain control based on light levels.