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This simple GSM security switch project is based on Arduino Nano microcontroller (MCU) and SIM800L GSM modem (Fig. 1). The cellular-based alert system is configured to send an SMS in response to a security switch action. When the security sensor...
LM317T and LM337T ICs are well-known, low-cost adjustable voltage regulators capable of delivering up to 1.5A current output with power dissipation of up to 20W. LM317T produces a positive output voltage, while LM337T produces a negative output voltage. It is...
Solar streetlights can be easily integrated with a dusk-dawn controller by simply employing a pnp transistor and a few resistors where the solar panel itself works as the sensor. But what about other lighting sources that do not employ...
This project can be used to control up to four industrial electrical appliances with the help of a joystick and an Arduino Nano board. The block diagram of the joystick-controlled industrial automation system is shown in Fig. 1. The circuit...
Electronics projects are always in high demand. Students work on them to improve their skills, whereas hobbyists like the fun in meddling with technology. For professionals, it’s a different ball game altogether. Mini projects form a middle ground for...
The purpose of this circuit is to create a new topology with good power factor maintained at AC voltage input, to provide good efficiency output to the battery and to increase its life. Circuit diagram of the dual-voltage rechargeable torch...
Presented here is a motion-sensor-based security system using Cayenne and Arduino Uno. Cayenne is the simplest and easiest platform for the Internet of Things (IoT) systems. It allows you to connect regular boards like Raspberry Pi, Arduino and LoRa,...
This is one of the simplest FM transmitters that can be built. It does not require any tuning, and transmit frequency is crystal locked to 90MHz. It eliminates frequency drift common to LC-based FM transmitters. This design is best...
Federal and international regulations require boats to carry lights between sunset and sunrise and during conditions of restricted visibility. The number and colours of the lights vary with the size of the vessel. Many commercial vessels carry special lights that...
There are at least two popular applications of blinking a string of 110V/230V AC incandescent lamps. The first is audio-visual warning at construction sites or where repairing is going on. The second is to express joy and excitement during...