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Metal Detector with speaker and ttl output.
- VCC 9v battery
- Logic high out put with common ground.
- Can detect any metal at the range of 1cm to 3cm. you can connect 9v battery to make it handy.
Note: it will not detect coins if it is in the middle of the coil, it may detect if it is close to the coil.
Metal Detector Sensor Module
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