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Engineering Projects For You

Free engineering project ideas, circuit diagrams and software codes for students and hobbyists. Complete instructions on DIY electronic devices. EFY tested circuits with source codes.

Intruder Detector Using Laser Torch

Here is a simple, low-cost intruder detector that uses an invisible laser beam to detect the intruder. The laser beam is produced using a 3V DC or 4.5V DC laser pointer...

Infrared Remote Control Timer

The circuit comprises two sections, namely, the transmitter section and the receiver section. Fig. 1 shows the IR transmitter section. The astable multivibrator NE555 (IC1) is used to generate a 10kHz...

Sound Scanner

This novel sound scanner sweeps all sound vibrations in its vicinity and converts them into audible beeps. It can sense sound vibrations up to a distance of 6 metres and can...

Low-Range AM Radio Transmitter

Here is a simple radio transmitter for transmission up to 25 metres. It is basically an AM modulator whose signal can be received on the normal AM radio. It can also...

0-100°C Temperature Detector

Here’s a temperature monitoring system capable of remote temperature reading without transmission losses in the conditioning circuit. The IC AD590 (IC4) is used as a temperature transducer. This semiconductor transducer provides...

Electric Shock Gun

This is a fantastic circuit for self-protection. In case a burglar intrudes your house, you can use this security circuit as a weapon for self-protection by giving a mild electric shock...

Automatic Water Pump Motor Controller

Municipal corporations in many cities supply water during early morning hours. So, you have to wake up early, just to switch on your motor pump and wait till your water tank...

Keypad Control for Multiple Appliances

This circuit employs DTMF technique to switch on/off up to ten appliances. It can be modified to operate up to 100 appliances using the same keypad. The controller uses telephone-type keypad with...

LEAD-ACID BATTERY CHARGER WITH VOLTAGE ANALYSER

Nowadays maintenance-free lead-acid batteries are common in vehicles, inverters, and UPS systems. If the battery is left in a poor state of charge, its useful life is shortened. It also reduces...

Water-Level Indicator

Here’s a simple water-level indicator for overhead tanks that uses three LEDs (LED1, LED2, and LED3) to indicate minimum, middle, and maximum water levels in the tank. The sensor probes comprise A,...

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Ultrasonic Distance Meter Using Raspberry Pi 2

Ultrasonic ranging module HC-SR04 provides 2cm to 400cm non-contact distance measurement range. Its accuracy can reach ±3mm...

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