We have used reflective type IR sensor modules in this project. An IR Sensor consists of 3 components: an IR Transmitter (IR LED), an IR Receiver (like a Photo Diode) and a signal processing circuit. Component Description IR Sensor ModuleĪn Infrared or IR Sensor is a simple circuit that is used to detect objects (Proximity Sensor) or measure distance (Range Finder). Alternatively, you can construct the circuit as per the circuit diagram (which consists of 5V Relay, Transistor, Diode and a Resistor). The detailed circuit of the 5V Relay module used in the project is explained in the component description section. The input of the 5V Relay is connected to PORT0 pin P0.0. Detailed circuit of the IR Sensor is mentioned in the Component Description. Two Reflective type IR Sensors are connected to PORT2 pins i.e. A 10 KΩ Potentiometer is connected to contrast adjust pin of LCD i.e. RS, RW and E are connected to P3.6, GND and P3.7 pins respectively. First, connect the 8 data pins of the LCD to PORT1 pins i.e.
Corresponding circuit diagrams are also provided.Ĭoming to the circuit design, a 16 x 2 LCD Display, two IR Sensors and a 5V Relay Module must be connected to the 8051 Microcontroller.
If you are doing this project on a development board, some of the connections mentioned in the circuit diagram might not be necessary.Īlso, we have used modules for Relay and IR Sensor and hence, the connections are shown with respect to those modules only. The circuit diagram shows all the connections with respect to microcontroller. Let us see the design of the circuit for automatic room lighting project. AT89C51 Microcontroller (any 8051 architecture based microcontroller).
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