DO NOT connect in any ways the main power supply that drive the LOAD to the arduino and transistor circuitry! Turn OFF the relay with delay You can use this code example to introduce a delay in your ...

Fig 1. An SPI-based output driver (in this case, an L9822 octal relay driver from STMicroelectronics) can be used to provide a random mix of I/O pins at the chip’s output. The circuit in (a ...

The card also includes 12-channel I/O, with input- or output-only versions available. I/O is accessed via a 78-pin DB female connector on the card’s mounting bracket. ACCES I/O PRODUCTS INC.