How to cause event only if certain block is underneath event-causing block?

Started by Sweddy on Thu, 03/10/2016 - 18:01
Last seen on 16:40, 4. Oct 2018
Joined Sep 2013
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How to cause event only if certain block is underneath event-causing block?
Thu, 03/10/2016 - 18:01

I want to make an automatic fishing machine.

How do I make it so it only works if there's water under it?