Switching applications involving controlling devices or appliances using digital-I/O lines through a relay often need to indicate the change of state of the I/O line and, hence, the connected device.

(ATR) As the Olympic Torch Relay heads into the second week of its 70-day tour around the UK, this month we take a look at the range of pins that have been released to celebrate the journey around the ...

Independently switching twoloads, such as relays, usually requirestwo microcontroller-I/O ports.Two ports let you control the loads sothat you can switch them both off,switch them both on, or switch ...