This voltage is used to drive the transistor that will switch ON the relay and ... supply that drive the LOAD to the arduino and transistor circuitry! You can use this code example to introduce a ...

In the past, an aspiring electronics enthusiast would have started with simple transistor circuits such as a light sensitive switch ... not throwing away their Arduino or Raspberry Pi, after ...

[Fileark] built and ESC using an Arduino and has a couple of posts explaining the concept and demonstrating how it works. His test circuit uses six 2N2222 transistors to protect the Arduino from ...

Here is a simple general-purpose security alarm circuit built on the Arduino ... and hence the reed switch should be in “closed”state at standby mode. When reed switch is opened, pin 2 of Arduino goes ...

In theory, the hundreds of photons, controlled by the triggering photon, could fan out and switch off hundreds of other transistors in an optical circuit. With its exotic clouds of atoms and bulky ...