Another good tutorial from Afrotechmods on how to choose a battery for your project.
A relay is basically a switch,… an electromagnetic switch. A small current flowing through a coil in the relay create a strong magnetic field that pulls one switch contact against or away from another. What really cool about relay is, you can use a low voltage, or a low current to control a higher voltage […]
Shift Register Tutotorial form Kevin Darrah. He explained how 75HC595 Shift Register works by using regular push switches instead of microcontroller. We think this is the best tutorial on the subject available on Youtube. On his website, www.kevindarrah.com, has also a great tutorials on building 8x8x8 RGB LED Cube using Arduino