Article in Dutch
Feed with 5 volt via the 5 volt port at the Arduino board, its better not to use 12 volt !
You can order
Arduino uno R3 board
4 Relay module via www.ebay.com
Please mail me with more tips
of those sketches is for own risk)
sequencer with 3 ports
sequencer with 3 ports and selecting pol for TX/RX
sequenser with 3ports and selecting pol for TX/RX with feedback from step2
sequencer with 4 ports
sequencer for latched relais
sequenser for latched relais 3 ports
Living in the Netherlands.