Connect up your stripboard as shown below, using the 270Ω resistor.
The Arduino is a convenient source of 5 Volts, that we will use to provide power to the LED and resistor. You do not need to do anything with your Arduino, except plug it into a USB cable.
With the 270 Ω resistor in place, the LED should be quite bright. If you swap out the 270 Ω resistor for the 470 Ω resistor, then the LED will appear a little dimmer. With the 2.2kΩ resistor in place the LED should be quite faint. Finally, with the 10 kΩ resistor in place, the LED will be just about visible. Pull the red jumper lead out of the breadboard and touch it into the hole and remove it, so that it acts like a switch. You should just be able to notice the difference.
Last updated on May 04, 2015
Published on Nov 29, 2012
Turning out the lights might help even more.