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Smart Switch Using Arduino And Alexa

Temperature sensor is used to control a switch (relay) to turn on or off the device.

How To Make An Adjustable 555 Timer Relay Switch

Learn how to make a precisely adjustable timer with a variable delay from 1 - 100 seconds that uses the 555 IC. The 555 timer is configured as a Monostable Multivibrator. The output load is driven by the relay switch which is in turn controlled by the timer circuit.

Vintage Bench-Top DC Hybrid Voltmeter

With a DC range of -25V to +25V, a voltmeter combining analog needle & digital LEDs to represent integer & fractional voltages respectively.

Diy Electronic Horn For A Bicycle Or Car

The LM555 generates an electronic horn signal which is amplified by an LM386. The tone and gain of the horn can be easily varied. The horn can be used in a car, scooter, cycle, and motorbike.

Lead Acid Battery Capacity Tester (updated)

A 12 V Lead-Acid Battery is Discharged at a Constant Current (Programmable) for a Period of Time to get Terminal Voltage VS Time curve

Alexa/adruino/pi Smart Electric Water Heater

Save money on your electric bill using Alexa and some mad IoT skillz. Like a Nest for your water heater.

I2c 7-segment Display With attiny85

An I2C device that uses common anode 7-segment displays.

Hand Gesture Controlled Appliance Switch

Control appliance using a hand gesture without any microcontroller, only bare electronic components.

Touched By Time – Cyborgism

I have no “sense of time - can I develop one? Tempo is a wearable device that feeds time data to my skin through vibration patterns.

Bio-smart Wear

My application is based on the use of this kind of devices to connect our body to the cloud.

Pov Cylinder With Arduino Due

The device displays animated GIF pictures on a rotating cylinder. The GIF pictures can be downloaded from a PC via Bluetooth.

Solar Energy Harvesting Project To Power A Remote Msp430 With 2.4ghz Notification

Solar energy can be harvested on a small scale to provide a self-sustaining energy source for remote installations.