Development of single chip microcomputer for fingerprint safe

Development of single chip microcomputer for fingerprint safe

Circuit board design parameters:

Fingerprint capacity: 100

Voltage: 4.5-7v, 5V recommended

Standby current: less than 5ua

Output voltage: equal to input voltage

Output current: less than 300mA

Battery power supply: 4 No. 5 batteries with a service life of more than 1 year (calculated as 10 times per day)

1. In the factory state, short press the start key (connected to the start interface), the fingerprint head is on, and all fingerprints can be used.

2. Fingerprint registration: short press the registration key to make a "dada" sound, and the white indicator light is on (when the indicator light is installed). Put your finger on the fingerprint acquisition window and hear a long sound of "tick" --, indicating that the increase is successful; If there is no operation within 8 seconds, the system will shut down automatically.

Tip: in order to obtain the effect, it is recommended to register the same finger three times according to different positions.

3. Use: short press the start key, put your finger on the acquisition window, hear the music sound, it indicates success, and the motor interface has voltage output (the voltage is the same as the input voltage) for 0.5 seconds.

4. Factory setting: press and hold the registration key for more than 3 seconds until both indicators flash. Release the key and wait for a moment. Hearing the long sound of "tick" -- indicates that the factory setting has been restored and all fingerprints have been deleted.

5. Low voltage alarm: the module is designed for low power consumption and uses four No. 5 batteries. When the battery is running out, three alarm sounds are heard each time, and two indicator lights are on for a while. At this time, please replace the battery as soon as possible.

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