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 ...

The hardware is consists of an Arduino microcontroller (here an Arduino Uno R3) and a pre-wired soil moisture sensor module. The soil moisture sensor module , built around the LM393 comparator, gives ...

As +5 V reaches 2.5 V, the CPLD output goes to logic zero, causing the optocoupler to switch the Darlington transistor ON. This, in turn, energizes the relay.

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.