door security alarm circuit - electronics projects

Door Security Alarm system

1. DOOR SECURITY ALARM SYSTEM GUIDED BY: Prof. Kalpana Pawse Dr. prof. Mahesh Goudar TEAM MEMBERS: 1.Vaishnav Lajurkar [E238] 2.Umesh Munde [E225] 3.Raviraj Sonar [E235]

2. DOOR SECURITY ALARM SYSTEM

3. UNDERSTANDING AND FUNCTIONING Security door alarms are simple electronic devices that trigger when an intruder or trespasser tries to gain access to any designated area. They are a necessary part of today’s home security systems. There are a number of electronic configurations available to implement such home security alarms. Here, we will take a look at implementing using a reed switch. The heart of this circuit is a magnetic reed switch. A reed switch comprises two ferromagnetic blades, separated by only a few microns. When another magnet comes close to these blades, the two blades pull towards one another. Once touching, the blades close the normally open (NO) contacts, allowing electricity to flow. Some reed switches also contain a non-ferromagnetic contact, which forms a normally closed (NC) output. Any approaching magnet will disconnect the contact and pull away from the switching contact.

4. WORKING & CONSTRUCTIONS: This circuit can be attached to any entry point such as doors, gates, etc , or any storage unit such as safes or drawers, where you want no intruders to trespass. As the safe/door with one terminal of reed switch attached to the surface is opened & brought close to the second terminal of the reed switch placed in close proximity. The magnetic connection is made through mutual inductance & sends a control signal to the base of the first BC547 transistor. The collector output of the first transistor triggers the 5V buzzer & the alarm goes off. In order to turn off the alarm, you simply displace the door back to its original position, moving the two reed switch terminals away from each other. This demagnetizes the two terminals & turns OFF the alarm.

5. COMPONENTS USED IN CIRCUIT : S.no Component Value Qty 1 Reed Switch – 1 2 NPN Transistor BC547 2 3 LED 5mm 1 4 Buzzer 5V 1 5 Resistor 680 Ohm, 100K 2 6 Capacitor 220uF 1 7 Soldering Iron 45W – 65W 1 8 Soldering wire with flux – 1 9 PCB – 1 10 DC Battery 9V 1 11 Battery clip – 1 12 Block Connectors – 1

6. BLOCK DIAGRAM OF CIRCUIT

7. CIRCUIT SIMULATION

8. PROTOTYPE ON BREADBOARD

9. CIRCUIT DESIGN ON KICAD SCHEMATIC EDITOR PCB EDITOR PRINTED CIRCUIT

10. Process Of Making Printed Circuit Board (PCB) Step 1: Path printed on copper PCB Step 2 : Dissolving copper in chemical Step 3:copper is dissolved from copper PCB excluding path

11. Step 4: By using sandpaper we clean the circuit , then made holes for assemble the components Step 5: The Final Output After assembling the components in PCB

12. SPECIFICATIONS: T wo-part magnetically operated proximity switch Standard normally open, high voltage normally open and change over contact configuration Moulded stand-offs to allow board washing RoHS Compliant Wave solder capable DATASHEET OF COMPONENTS CAPACITOR 1 2 SPECIFICATIONS: Capacitance:        220uF Voltage:               25V   Capacitor Type:     Electrolytic  REED SWITCH

13. SPECIFICATIONS: 680 Ohm, 100K For 680 Ohm: 1.Value: 680 Ohm 2.Tolerance: 5% 3. Power: 0.5W 4. Temperature : 55°C~155°C For 100k Ohm: Highly Reliable 100K ohm Resistor ±5% Tolerance Power Rating: 0.25W Package: Axial SPECIFICATIONS: • Switching and Amplifier • High-Voltage: BC546, VCEO = 65 V • Low-Noise: BC549, BC550 • Complement to BC556, BC557, BC558, BC559, and BC560 RESISTOR TRANSISTOR (BC547) 3 4

14. SPECIFICATIONS: ․High luminous power. ․Typical chromaticity coordinates x=0.30, y=0.29 according to CIE1931. ․Bulk, available taped on reel. ․ESD-withstand voltage: up to 4KV ․The product itself will remain within RoHS compliant version. SPECIFICATIONS: Rated Voltage: 5V DC Operating Voltage: 5-8V DC Rated current: <30mA Sound Type: Continuous Beep Resonant Frequency: ~2300 Hz  Small and neat sealed package Breadboard and Perf board friendly   5 BUZZER 6 LED

15. DEMONSTRATION OF PROTOTYPE

16. APPLICATIONS Door Sensors: Magnetic door/window sensors can be used to detect when a door is opened or closed. These sensors typically consist of two parts: one attached to the door frame and the other to the door itself. Microcontroller/Single Board Computer: Use a microcontroller (e.g., Arduino, Raspberry Pi) to interface with the door sensors and manage the system. Connect the sensors to the microcontroller to detect changes in the door status. Wi-Fi/Bluetooth Module: Integrate a Wi-Fi or Bluetooth module to enable communication between the microcontroller and the application. Alarm/Buzzer: Include an alarm or buzzer to produce a loud sound when an unauthorized entry is detected.

17. REFERENCES: https://youtu.be/_j0csUukEzQ?si=yteuQXsHc_unjUiu https://en.wikipedia.org/wiki/circuit https://en.wikipedia.org/wiki/Transistor https://www.electronicshub.org/what-is-reedswitch/

18. YOU!! THANK