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This controller circuit based on an infrared (IR) object sensor (Sharp 2Y0A21) is used for saving power of the mirror light near a washbasin. The circuit contains manual on and off switches and an additional automatic switching system. Circuit and...
Use of brushless DC motors (BLDCs) is on the rise. But their control usually requires rotor position information for selecting the appropriate commutation angle. Normally, a Hall Effect sensor is used to sense rotor position. But in cost sensitive...
This portable solar-powered lantern with auto bedlight for everyday use can be made with easily available components. The circuit diagram of the portable solar lantern cum bedlight is shown in Fig. 1. It is built around a 5.5V, 60mA solar...
This project describes how to connect a web camera to the Raspberry Pi and make use of it. Raspberry Pi board has an onboard connector which can be used for connecting the camera directly. Connect the camera very carefully,...
Here we put all the theory to work and present a simple 1.5W power amplifier module that can be easily built with readily available components. The block diagram of the amplifier is shown in Fig. 1. It is typical...
Presented here is a simple humidity controller and indicator. In industries such as textile, the change in moisture content has a direct impact on the properties of fabric, such as tensile strength, elasticity, fibre diameter and friction. Therefore the...
Electromyography (EMG) is a technique of recording muscular activities by measuring the potential difference across a muscle of interest. EMG signal acquisition is the latest trend as it paves way for a new method of human-machine interface (HMI). Here,...
This circuit uses a NE555 timer IC, some LEDs, a couple of piezo buzzers and a few other components to produce audio-visual effects as per your requirement. The timer NE555 and its equivalents are widely used for all sorts...
A lot of accidents happen every day due to drunk driving. This is a very useful circuit for testing whether a driver is drunk or not. The circuit is easy to use, inexpensive and indicates various levels of alcohol...
Normally, ATMEL’s AVR microcontrollers are programmed using programmers. There are many ways to program the AVR microcontrollers, such as in-system programming, parallel programming and using bootloader. Advantage with the bootloader method is that you don’t need any external hardware...