Simple Key-Operated Gate Locking System
This simple key-operated gate locking system allows only those persons who know the preset code to open the gate. The code is to be entered from the keypad within the preset...
Voice and Google Assistant Control Universal Remote For TV And AC
We all have televisions in our homes, whether it is a slim smart TV or a large CRT-based TV. And they require a set top box for obtaining different television channels....
Call Bell With Welcome Indication
Here is a simple call bell circuit that displays a welcome message when somebody presses the call bell switch momentarily. The alphanumeric display can be fitted near the call bell switch.
The...
Electronic Bicycle Lock
The electronic bicycle lock described here is a worthwhile alternative for bicycle owners who want to make their bicycles 'intelligent' at reasonable cost. One of the benefits of building it yourself...
Optical Slave Flash Trigger
A "slave flash" (also known as speed light/strobe) is a flashgun that sits around quietly until it sees a bright light. When the slave sees a flash, it flashes itself. Employing...
Laser Light Security Alarm
The aim of this article to make a laser light security alarm and it can also be used as a home security system. The essence of this project is that anyone...
Car Fan Speed Controller
Using this fan speed controller circuit you can control the speed of 12V DC fans used in cars. The circuit is built around timer 555, which is wired as an astable...
Light Operated Internal Door Latch
Using this light operated door latch circuit, you can close or open the door of your room remotely from your bed. You just have to focus the torchlight on the light...
Simulate Smartphone Screen Lock/Unlock Application
An Android phone allows itself to be locked/unlocked using a password, pattern on a grid of nine dots, fingerprint or facial recognition. An Android phone using a password needs a sequence...
DC Motor Control Using Single Switch
This is a circuit that controls a DC motor to run it in clockwise, anti clockwise direction and to stop it using a single switch. It has three LEDs that indicate the status of motor; stopped, forward rotation and reverse rotation respectively.
