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How do I make a biometric (fingerprint) scanner based keyless ignition for my car?

April 26, 2017based biometric car fingerprint ignition keyless scanner

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How do I make a biometric (fingerprint) scanner based keyless ignition for my car?

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I need advice on how to make a fingerprint scanner control a 12v relay for use as a keyless ignition for my car. I know how to do the wiring as far as the car’s ignition/starting system, what I don’t know is how to make a fingerprint scanner close a 12v relay and keep it closed until I turn the car off. Any help, suggestions, or guidance would be appreciated.