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...
Micro-Solder Pot
To make a great solder joint, component preparation is a must. This sounds unimportant, but it is very important to clean the component leads,...
Electronic Eye Security System
The electronic eye security systems available in the market are expensive, and programming is very difficult for a microcontroller based system. Here is a...
Optical Smoke Alarm
An optical smoke alarm (also called photo-electric smoke alarm) works using the light scatter principle. The alarm contains a pulsed Infra red LED which...
Battery Low Indicator
Rechargeable batteries should not be discharged below a certain voltage level. This lower voltage limit depends upon the type of the battery. This simple...
Versatile Water-Level Controller
This simple, economical and versatile water level controller circuit switches on the motor pump when water in the overhead tank falls below the lowest...
Two-Watt TBA820M AF Amplifier
Here is a simple AF amplifier project based on TBA820M IC. This amplifier can deliver two-watt output power with 8-ohm speaker using a 12V...
Wireless-Powered LED
Wireless power is transferred from transmitter to receiver coil using inductive coupling principle. For wireless power transfer to work efficiently, frequency of the transmitter...