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This article describes the implementation of a digital frequency meter using Arduino Uno to determine the sinusoidal frequency signal in the range of 20Hz to 5kHz. The logic involves counting the total number of pulses per second that appear...
This circuit can be used to control up to four electrical devices through a cellphone or computer. The main advantage is that you can login from anywhere to control the device(s). If you try to login using invalid credentials...
Many single-ended analogue signals do not have DC components or appropriate DC offsets. Due to that, these require very high input resistance for analogue-to-digital converter (ADC) inputs. This simple universal dual level shifter and buffer for AC and audio...
The Automatic Battery Charger circuit presented here can automatically charge a 12V, 7Ah battery, or above. Special features of the charger are as follows. It automatically controls the charging current as per the status of the battery. Battery voltage...
This Multi-Utility Protection System project is used for fire detection and then sending an SMS alert to a cellphone. The design is based on Arduino Uno. The project also includes an LCD and an LED for visual indications, and...
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...
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 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...