[Rockwell] sent us an update on his traffic light hacking ... and an Arduino serial to USB module for connectivity. The AC load switching is handled by three relays. The relays he links to ...

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 ...

The Arduino Pro Mini used to control the traffic light is not only responsible for playing the tones through a piezo speaker, but as you might expect, for firing off the relays which ultimately ...

In this project, we are going to build something very simple project, a temperature controlled relay that is used to turn on a dc fan. You can actually change the DC Fan to other electrical devices ...

But none of them come close to the awesomeness of this traffic light server monitoring system, which has been created using a little Arduino wizardry. The monitor has been created to work ...

Cook At this point, your Arduino has the ability to sense ... clear plastic can interfere with infrared light. You can just leave the power relay on top of the enclosure, ready to use with your ...

Droplet and StackAR, developed by MIT’s Media Lab, allow users to set timers or program an Arduino using light-based communication. By pressing the tool against a screen, flashes of light can ...