That is why you must use an external power supply (Vcc) that is between 7 to 12 volts to power up the Arduino board and the transistor + relay. The load uses its own power supply, for instance if you ...

To build your very own Arduino Water Surface Lamp, you will need the following materials and tools: – Arduino microcontroller (e.g., Arduino Uno) – LED strip or individual LEDs ...

[Jason] really wanted to build an RFID controlled garage door opener and decided to turn to Arduino to get ... to select how long the relay circuit should remain open.

Frankly we’re tired of Arduino having a bad name here at Hackaday. So [Brian Benchoff] came up with a way to make it useful to a wider audience. His creation, which we call the HaDuino, lets … ...

Over the last decade, the open-source ... input and relay control. Pi runs a Python Flask server with a simple UI to toggle GPIO pins via serial commands sent to the Arduino. Use cron jobs on Linux to ...

Industrial engineer Javier Lander has taken a €5 lamp purchased from ... but for a real-life example of Arduino wizardry, it’s an excellent modification. Arduino is an open-source electronics ...