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Biometric Door Lock

Biometric Door Lock

smart door locks is the combined of electronic technology and integrated circuit design, a large number of electronic components, combined with a variety of innovative recognition technology (including the computer network technology, the built-in software card, network alarm, mechanical design of the lock body) and other integrated products.

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In order to prevent communication lines of man-made destruction and electromagnetic actuators for some reason cause excessive current flows through the electromagnetic coil and burning coil, this paper adopts the current monitoring technology in the intelligent combination lock design.Current monitor by MAXIM company's current/voltage conversion chip MAX471.The chip will be measured current I translate into the output voltage U, and a large measuring range, high precision, is directly proportional to the measured current output voltage U and I wait for a characteristic.Current monitor output voltage to send A/D converter, single-chip microcomputer by reading A/D conversion results, obtained the change of the current situation in line, through the analysis of abnormal in time, send out alarm signal.Principle of the circuit as shown in figure 4.

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