Hi , i'm new with arduino and i would like to know if it's possible to use an arduino ( wich one ? ) for control drycontact like a simple switch on/off .
- When i press S1 i want to closed S2
- If i press S1 3 seconds or more i want to switch and control S3 . press S1 can now closed S3
- If i press again S1 for 3 seconds i control S4 . press S1 can now closed S4
- If i press S1 3 seconds i control S2 ...
Thx in advance