I have wanted to build a device for my Snail Mail USPS Box to alert me when my box was opened. Good for security, but mostly because my box is 150 ft. from the door and I want to avoid unnecessary trips or stops at the box. I tried to use a hacked Amazon Dash Button as described in several places on...By: TomDunlap
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from Instructables: exploring https://ift.tt/2J1bEdj
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