I live in India and its very difficult to procure original electronic stuff here. Mostly I get some chinese made, not sure about quality.
So, I wanted to start a rPi project, to control my table lamp. From Google I found two types of relays.
Assuming if I use such cheap quality relays:
- If I use electromagnetic relay, can it harm rPi?
- If I use electromagnetic relay, can it harm the connected electronic appliance?
- If I use solid state relay, can it harm rPi?
- If I use solid state relay, can it harm the connected electronic appliance?
Any either of them can harm rPi or electronic appliance, how do I protect them?
Please assume that I am gonna circuit correctly. (and also can these device act as fail safe and even if I make mistake in my circuiting, can they protect rPi or electronic appliance?)
and lastly, what if I connect them all to an ungrounded power supply?