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The accidental pressing of the on/off switch due to human error may cause the failure of the system it is connected to, or cause unnecessary delay to a part of the parent circuit. This could, in turn, cost money...
This timer switch for an electric water heater is based on NodeMCU and Blynk IoT cloud solution. An electric water heater is used in bathrooms during the cold season for bathing with hot water. A common problem is that...
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...
This project is a IoT based data logger system that displays temperature and humidity on ThingSpeak.com using WeMos D1 R2 board. You can add more data to the project—up to eight data per channel. WeMos board WeMos D1 R2 board looks...
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 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 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...