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Noise Level Alarm

Noise is a serious environmental problem that affects us in our daily life. There is scientific evidence supporting that noise exposure can cause hearing...

Voice Recorder and Playback System

There are several types of voice recorder and playback systems available in the market but most of them are expensive and their circuits are...

Low Power Voltage Doubler

All miniature electronic devices operate off batteries. Some of them need higher than the standard battery voltages to operate efficiently. If the battery of...

LED As Light Sensor

Usually light dependent resistors (LDR) and photodiodes are used as light sensors to activate or deactivate circuits based on the presence or absence of...

Cistern Overflow Alert System

The overflow alert system presented here will electronically monitor cistern (tank that holds water to flush the toilet) overflows that can otherwise cause seepage...

School/College Quiz Buzzer

Manual buzzers used for quiz competitions in schools and colleges create a lot of confusion in identifying the first respondent. Although there are circuits...

IoT Based Smart Camera Using Android And Raspberry Pi

Presented here is a project that lets your Raspberry Pi (RPi) turn into an IoT based smart camera and then control and watch live...

Infrared Object Counter

This infrared object counter can be installed at the entry gate to count the total number of people entering any venue. For example, it...

Moisture Monitor for Plants

Over-watering and under-watering both are harmful for plants. Roots need air as well as water. If the soil is constantly saturated, air cannot reach...

How To Make A Business Card Flashlight

Here we make a business card useful by turing it into a business card flashlight, that people really do not want to throw away...

Simple Suitcase-Lift Alarm

This suitcase-lift alarm circuit uses vibration sensor HDX-2NC instead of a commercially available sensor. A home-made mercury switch can also be used instead. Suitcase-lift alarm...

Laser Security System

Presented here is a 6v Laser security system that can be easily programmed for any password. This project powered using a mobile charger which...

Brake Failure Indicator

Do you want to get an early warning of brake failure while driving? Here is a brake failure indicator circuit that constantly monitors the...

Fire Alarm Using a Thermistor

This thermistor based fire alarm project can effectively be used as a temperature-sensing fire alarm. Here, an NTC thermistor is used as the temperature...

Auto Turn-off Battery Charger

This auto turn-off battery charger for series-connected 4-cell AA batteries automatically disconnects from mains to stop charging when the batteries are fully charged. It...

Optoreflective Sensor

Here is a simple optoreflective sensor circuit based on TCRT5000 module. It is ideal for projects like robotics, position sensing, proximity sensing, detection of...

USB LED Night Light

A typical USB LED bulb shown in Fig. 1 is a 5V, 5W USB-powered solid-state lamp. At the heart of this light bulb is...

Remote Control for Home Appliances

The influx of the Internet of things (IoT) devices has created a huge demand for connecting everything to everything. In the same race, this...
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