Im now to use this and program this.
I buy an arduino mega + ethernet shield 2 and 4 relays shield I assemble this and find a sketch to command the relay.
I mod it to use only 3 relay atm my problem is the relay 1 is command with pin 4 that use with ethernet shield … programm work fine to relay 2-4 but the relay 1 is always on if I put on code the commmand to use relay 1 the relay go on loop up and down …
there’s same possibility to fix problem or is an hardware bug ? if possible disable relay 1? attached file fo sketch