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Going up or down a staircase can be a challenging task at night, especially for kids and elderly people. This Automatic LED Staircase Light circuit lights up two LEDs, one at each end of the staircase, for a couple...
This article describes the basic installation of an RFID and password-based access control system. Access control systems allow only the authorised persons to enter or exit the premises. An access control system may include locks, turnstiles, biometric readers, face...
In this project, the Arduino Uno is configured as a square wave generator with user-selectable control of the frequency and duty cycle. The operating range of the system is up to 10kHz. The desired frequency and duty cycle of...
Traditional switches are outdated now. These switches have mechanical moving parts that get damaged on continuous use. Many old switchboards are getting replaced by modern touch switches that not only enhance the look of our homes but are easier and...
An accelerometer, which is an electromechanical device, can be used for various applications like tilt detection, obstacle detection, motion inputs, earthquake sensing, etc. Tilt detection is a simple application of an accelerometer where a change in angular position of...
This is a simple function generator that works in the audio frequency range. It can be useful for amplifier testing, experimentation in digital signal processing (DSP) and electronics labs. The author’s prototype is shown in Fig. 1. Circuit diagram of...
We have seen different types of human interface devices (HID), such as mouse and keyboard. In older versions of the mouse, optical sensors were used to detect movement relative to a surface, thus they required a smooth surface to...
This Device Controller project based on an 8-bit ATmega328P microcontroller (MCU) can control up to eight devices connected to its electromagnetic relays. The article also describes how to program an MCU to accept infrared (IR) remote control signals for...
Here is a simple stereo amplifier you can make with a CD6283 audio amplifier and a few passive components. It provides an output of 4.6 watts per channel with a 12V power supply. Circuit diagram of the stereo amplifier is...
This GPS-based project displays analogue clock and room temperature on a TFT display. GPS time is a precise time standard that is related to Coordinated Universal Time (UTC). The displays of most electronic hobby projects are based on LCD,...