Automatic room light controller
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The document presents a project on an automatic room light controller with a bidirectional visitor counter, which uses infrared sensors and a microcontroller to count occupants and control lighting in a room. The system increments a counter when someone enters, activates the lights, and decrements the counter upon exit, ensuring lights are turned off only when the room is empty. It includes a detailed circuit description, components used, and potential applications for automation in home and office environments.
Automatic room light controller
- 1. Presented to : Saikat Basak Senior Lecturer Department of EEE Daffodil International University Presented by Md. Jannatul Nayim Giyem Id: 163-33-3647 Md. Arifur Rahman Id: 172-33-4126 Arafat Sarkar Id: 172-33-4126 S M Hasibul Bashar Id: 172-33-4084 Most. Sumaya Nasrin Id: 172-33-3987 Nokib Parvez Id: 172-33-3991 Course Title : Signals and Systems Course Code : EEE227 Section: A (L2 T1) Summer’2018 Department of EEE Daffodil International University1 PRESENTATION welcome to Our
- 2. AUTOMATIC ROOM LIGHT CONTROLLER WITH BIDIRECTIONAL VISITOR COUNTER topic :
- 3. Definition ✘ The objective of this project is to make a controller based model to count ✘ number of persons visiting particular room and accordingly light up the room. ✘ Here we can use sensor and can know present number of persons. 3
- 4. In today’s world, there is a continuous need for automatic appliances. With the increase in standard of living, there is a sense of urgency for developing circuits that would ease the complexity of life. Automatic Room Light Controller with Visitor counter using Microcontroller is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately When somebody enters into the room then the counter is incremented by one and the light in the room will be switched ON and when any one leaves the room then the counter is decremented by one. The light will be only switched OFF until all the persons in the room go out. The total number of persons inside the room is also displayed on the seven segment displays. The microcontroller does the above job. It receives the signals from the sensors, and this signal is operated under the control of software which is stored in ROM. Microcontroller AT89S52 continuously monitor the Infrared Receivers, When any object pass through the IR Receiver's then the IR Rays falling on the receiver are obstructed , this obstruction is sensed by the Microcontroller.
- 5. BLOCKDIAGRAM AND ITS DESCRIPTION 1. Power Supply 2. 2. Entry and Exit sensor circuit 3. 3. AT 89S52 micro-controller 4. 4. Relay driver circuit 5 The basic block diagram of the bidirectional visitor counter with automatic light controller is shown in the above figure. Mainly this block diagram consists of the following essential blocks.
- 6. SCHEMATIC DIAGRAM & CIRCUIT DESCRIPTION CIRCUIT DESCRIPTION There are two main parts of the circuits. 1. Transmission Circuit (Infrared LEDs) 2. Receiver Circuit (Sensors) Transmission circuit 6
- 8. LIST OF COMPONENTS 1. Microcontroller – AT89S52 2. IC – 7805 3. Sensor – TSOP 1738 (Infrared Sensor) 4. Transformer – 12-0-12, 500 mA 5. Preset – 4.7K 6. Disc capacitor – 104,33pF 7. Reset button switch 8. Rectifier diode – IN4148 9. Transistor – BC 547, 2N2222 10.7-Segment Display 8
- 9. Description of Components 1. Microcontroller AT89S52 9 FEATURES 1. 8 KB Reprogrammable flash. 2. 32 Programmable I/O lines. 3. 16 bit Timer/Counter—3. 4. 8 Interrupt sources. 5. Power range: 4V – 5.5V 6. Endurance : 1000 Writes / Erase cycles 7. Fully static operation: 0 Hz to 33 MHz 8. Three level program memory lock 9. Power off flag 10.Full duplex UART serial channel 11.Low power idle and power down modes 12.Interrupt recovery from power down modes 13.256 KB internal RAM 14. Dual data pointer Features 1. Photo detector and preamplifier in one package 2. Internal filter for PCM frequency 3. Improved shielding against electrical field disturbance 4. TTL and CMOS compatibility 5. Output active low 6. Low power consumption 7. High immunity against ambient light 8. Continuous data transmission possible (up to 2400 bps) 2.TSOP1738 (INFRARED SENSOR)
- 10. 3. 555 (TIMER IC) Features 1. Direct replacement for SE555/NE555 2. Timing from microseconds through hours 3. Operates in both as table and monostable modes 4. Adjustable duty cycle 5. Output can source or sink 200 mA Output and supply TTL compatible 6. Temperature stability better than 0.005% per °C 7. Normally on and normally off output 8. Available in 8-pin MSOP package 10 4. LTS 542 (7-Segment Display) Features 1. Common Anode 2. 0.52 Inch Digit Height 3. Continuous Uniform Segments 4. Low power Requirement 5. Excellent Characters Appearance
- 11. 5 .LM7805 (Voltage Regulator) Features 1. Output Current up to 1A 2. Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24V 3. Thermal Overload Protection 4. Short Circuit Protection 11 6 RELAY CIRCUIT A single pole dabble throw (SPDT) relay is connected to port RB1 of the microcontroller through a driver transistor.
- 12. FLOW CHART 12 If the sensor 1 is interrupted first then the microcontroller will look for the sensor 2, and if it is interrupted then the microcontroller will Increment the count and switch on the relay, if it is first time interrupted. If the sensor 2 is interrupted first then the microcontroller will look for the sensor 1, and if it is interrupted then the microcontroller will decrement the count. When the last person leaves the room then counter goes to 0 and that time the relay will turn off, and light will be turned off
- 13. PROJECT PROGRAM Write down proper code by code blocks And give commands. 13
- 14. FUTURE EXPANSION 1. By using this circuit and proper power supply we can implement various applications Such as fans, tube lights, etc. 2. 2. By modifying this circuit and using two relays we can achieve a task of opening and closing the door. 14
- 15. ADVANTAGES & DISADVANTAGES & APPLICATION, Advantages 1. Low cost 2. Easy to use 3. Implement in single door Disadvantages 1. It is used only when one single person cuts the rays of the sensor hence it cannot be used when two person cross simultaneously. Application 1. For counting purposes 2. For automatic room light control 15
- 16. REFERENCE BOOKS & WEBSITE Reference Books 1. Programming in ANSIC: E BALAGURUSAMY 2. The 8051microcontroller and embedded systems: MUHAMMAD ALI MAZIDI 3. JANICE GILLISPIE MAZIDI 4. The 8051 microcontroller: KENNETH J. AYALA Website 1. www.datasheets4u.com 2. www.8051.com 16