Hello I need 20 relays (230V) for floor heating switching. What is the cheapest way to realize those relays. I´m thinkink about mulitple SONOFF 4CH. Is there something cheaper (wireless)? I would prefer something with single wireless connection (lets say single arduino board with multiple hardware relays etc.). Any idea? Thanks.
Jiran,
No idea. I dare say SonOff is the cheapest solution.
Regards
I have had some bad experiences with poorly designed and manufactured devices connected to mains line. Two deceives failed on me once and actually scorched the wall plug. I love buying cheap components from China for switching low voltage loads, but anything that has the potential to burn the place down I try to stick with something that is at least UL/CE certified and has some good reviews.
Have you had a look at https://shelly.cloud
They have single double and I think even 4 relay modules.
Sorry, but this is VERY expensive comparing to others.
Yes, i suspect as they have the safety markings and bits.