This circuit is for simple Smoke Detector Circuit using IC LM358, as it uses MQ2 gas sensor to sense smoke; also it uses LM358 IC to compare sensor voltage. Therefore, when smoke is present the buzzer and LED turn ON and, in addition, this circuit is good for beginners. Circuit Working: Parts List: Components Quantity […]
Alarm Circuits
MQ2 Gas Sensor Circuit with Arduino
The MQ2 Gas Sensor Circuit with Arduino is a low-cost sensor, as 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. Also, this circuit is very simple […]
Gas Alarm Circuit using MQ Sensor and Buzzer
A Gas Alarm Circuit using an MQ Sensor and a buzzer gives a quick warning when the gas level becomes dangerous; also the MQ Sensor quickly detects a gas leak, and the buzzer produces a loud sound when it detects gas. Moreover, circuit runs on 5V and uses very few parts and it is good […]
Chirping Sound Buzzer Circuit
This simple circuit makes a normal buzzer produce a chirping or tweeting sound; it uses a 9 V battery, two push buttons, one capacitor, and a buzzer, also the circuit also does not need a microcontroller or IC. Also, it works on charging and discharging of capacitor and this Chirping Sound Buzzer Circuit is good […]
Make Sound with Arduino using Buzzer Circuit
This project shows how to Make Sound with Arduino using Buzzer Circuit; also buzzer makes sound when we send signal from Arduino pin. Here, we can use it for alarms, alerts, or simple tones; moreover, we use two versions here: one with individual components and another with a buzzer module. Arduino Code: Code Explanation: Parts […]
Electronic Eye Circuit using IC 4049
This project is for small Electronic Eye Circuit using IC 4049, which can sense darkness or shadow. When light falls on the LDR, the circuit remains OFF and when an object blocks the light, the LED and buzzer turns ON; moreover, this circuit also works like a magic eye and is useful for security systems […]