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I'm making a proximity sensor alarm for my car which recently had it's tyres slashed and with the addition of the antennae this instructable works a treat. I'm wondering if I could use the car bodywork as one huge antennae. I'll let you know how i get on. Many thanks
By far the most time consuming and costly part of this project is constructing the box. A ferrero rocher box should work but can be prone to cracking when drilled. Heat up an old drill bit or even use your soldering iron (with an old tip) and burn the holes out.
Simple Arduino and HC-SR04 Example
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