Security plays a very important role in todays world, therefore electronic code locks are very useful. This Digital Code Lock Circuit using IC 4017 is a simple. It uses push buttons, diodes, resistors, capacitor and IC CD 4017 . Moreover, it is low cost and easy to build and it works on 9V power supply. […]
Security and Protection
Laser Light Alarm Circuit using Arduino
This article is for simple Laser Light Alarm Circuit using Arduino. A laser light shines on an LDR. When someone blocks the laser beam, the LDR changes its value. Arduino reads this change and turns ON the buzzer to make alarm sound. A reset button stops the alarm. The system is low cost and easy […]
Laser Security Alarm Circuit using LDR and BC547 Transistors
This project is for Laser Security Alarm Circuit using LDR and BC547 Transistors. It uses LDR, two BC547 transistors, one diode and a buzzer. When laser light breaks an alarm rings. Circuit is cheap and very easy to build. Good for door security, box security and drawer protection. Circuit Working: Parts List: Component Value Quantity […]
Women Safety Alarm Circuit using GPS GSM NodeMCU
This article is for Women Safety Alarm Circuit using GPS GSM NodeMCU. It uses NodeMCU ESP8266 board as brain. GPS module give location. GSM module send SMS to family. One push button used to send alert. Circuit Coding: Coding Explanation: Circuit Working: Parts List: Components Quantity NodeMCU ESP8266 Board 1 GPS Module (NEO-6M) 1 GSM […]
Luggage Safety Alarm Circuit using IC LM358
Today security is big problem everywhere. Many time thief try to open bag or suitcase in bus, train or station. We cannot always watch our luggage. This small Luggage Safety Alarm Circuit using IC LM358 help to protect our bag. It uses piezo sensor and LM358 to sense vibration. When someone touches or try to […]
Simple Wire Loop Security Alarm Circuit
Simple wire loop alarm is small security circuit. It uses thin wire as sensor loop. If loop is cut or opened the buzzer will sound. It works on 9V battery, needs few parts, is cheap and easy to make. Circuit Working: Parts List: Component Specification Qty Resistors 4.7M 1/4 watt 1 100k 1/4 watt 1 […]