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Pulse-width modulation (PWM) is one of the oldest and widely used techniques of controlling electrical motors. To control the speed of the motor, the average value of the PWM pulse is controlled by a switch. If the switch is...
Here’s a automatic water pump controller circuit that controls the water pump motor. The motor gets automatically switched on when water in the overhead tank (OHT) falls below the lower limit. Similarly, it gets switched off when the tank...
This LED Night Lamp uses a 1.5W LED module operated on a 12V DC power supply. Here, an L14F1 phototransistor works as a sensor. When there is sufficient light falling on the sensor, LED remains off; but when there...
Presented here is a 4-digit Industrial Digital thermometer based on ATmega16 microcontroller (MCU), which can measure temperature up to 1024°C. Normal thermometers have a limited range, and can easily get damaged at very high temperatures. So thermocouples are used in...
Generally, solar panels are stationary and do not follow the movement of the sun. Here is a solar tracker system that tracks the sun’s movement across the sky and tries to maintain the solar panel perpendicular to the sun’s...
This project is based on Raspberry Pi and Python programming, and sends real time sensor data via Gmail. Raspberry Pi is a single-board computer with several features. Connection details of the ultrasonic sensor with Raspberry Pi are shown in...
This portable emergency light is based on a DC-to-DC booster module and a power bank. The emergency light is designed to provide sufficient illumination in case of mains power failure. Generally, a sealed lead-acid battery is used for an...
The circuit for an LPG leakage detector is readily available in the market, but it is extremely expensive and usually based on a microcontroller (MCU). Presented here is a low-cost circuit for an LPG detector that you can build...
The circuit described here is a dual-channel audio signal tracer and tester. An audio signal tracer is a simple device to check the presence of audio signals in radio and other electronic circuitry, including audio filters, preamplifiers and audio...
Generally, the total number of appliances that can be controlled without using a microcontroller (MCU) is limited to three or four. One possible solution to this limitation is described in this project. Using this circuit, you can control up...