How Hard was it to built a earthquake alarm? And was it helpful?

Question: How Hard was it to built a earthquake alarm? And was it helpful?
- Keywords:
  earth,
  earthquake
Asked by Jessica109 to Andrea on 4 Mar 2019.
- Andrea Pacheco answered on 4 Mar 2019:
  
  Not hard at all :). I just needed materials to build a circuit and a tiny bit of design. When you have the tools and a good attitude you can solve/build everything
  
  Well I tested it by shaking the table and it worked 🙂 in Colombia we do not have much earthquakes then I could not test it in the real scenario but I am confident it could work, if not, there is always place for improvement.

Jessica109 commented on 6 Mar 2019:

That is so interesting,
thank you.

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Question: How Hard was it to built a earthquake alarm? And was it helpful?