This Fire Alarm Circuit using IC LM358 is simple but smart. It uses a 10k thermistor and LM358 IC. It watches heat using a thermistor and makes buzzer ring when danger comes. This circuit is cheap and is good for home, school projects and safety demos. Circuit Working: Parts List: Component Value / Type Resistors […]
Sensors and Detectors
Smoke Detector Circuit using IC LM358
This circuit is for simple Smoke Detector Circuit using IC LM358. It uses MQ2 gas sensor to sense smoke. It uses LM358 IC to compare sensor voltage. When smoke is present the buzzer and LED turn ON. This circuit is good for beginners. Circuit Working: Parts List: Component Quantity Resistors 10k 1/4 watt 1 100Ω […]
MQ2 Gas Sensor Circuit with Arduino
The MQ2 Gas Sensor Circuit with Arduino is a low-cost sensor. It can catch bad gas in air very quickly. When we connect it with Arduino, we make small gas alarm system. It reads gas level, show number on LCD and buzzer make sound when gas goes high. This circuit is very simple to make […]
Gas Alarm Circuit using MQ Sensor and Buzzer
A Gas Alarm Circuit using MQ Sensor and Buzzer gives quick warning when gas level becomes dangerous. MQ Sensor senses gas leak fast and buzzer makes loud sound when gas is found. Circuit runs on 5V and uses very few parts. It is good for low-cost safety at home, kitchen and workplace. Circuit Working: Parts […]
Obstacle Detection Circuit with 555 Timer and Ultrasonic Sensor
Want to build a smart obstacle detector without using Arduino? This simple project uses a 555 timer and an ultrasonic sensor to sense distance and control a DC motor automatically. It is easy to make with low-cost and perfect for beginners in electronics. This Obstacle Detection Circuit with 555 Timer and Ultrasonic Sensor is a […]
Simple Human Touch Sensor Circuit with Transistor
A human touch can do magic! This Simple Human Touch Sensor Circuit with Transistor shows how a tiny finger touch can switch ON a light. No switch, no button just a skin current makes it work. It is a cool and educational mini project for learners. Circuit Working: Parts List: Component Name Specification Quantity Resistor […]