You can control the brightness of these LEDs using variable resistors VR1 ... we can use the low voltage output from the Arduino ports to control high voltage/current loads -the popular “12V LED ...

The image shown below indicates the basic wiring diagram of the current limiting resistors and driver transistors. Next is the Hookup diagram of the Arduino 4-Digit 7-segment LED Display, followed by ...

[Martin] sent in a great guide to a simple Arduino based theremin ... and a few caps and resistors. When a hand moves closer to the antenna, the frequency of the oscillator increases; when ...

And there are current limiting resistors to protect the Raspberry Pi’s inputs ... As described on the Hackster Profar blog, as features go, the Shield sports a reset switch, power LED, Arduino pin 13 ...

It may look a little shoddy, but what’s amazing is that this very functional 3-D interface was built by a hobbyist with parts most DIYers can find in their couch cushions—six resistors ...