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3 Posts
Discussion Starter · #1 ·
Hello, it may be in correct place to post this.

I really want to fingerprint to work with beam sensor.

1- People can walk across beam sensor without any problem if they scan fingerprint and verified.
2- Alarm will be exposed if people walk across beam sensor without scan their fingerprint or failed to verify their fingerprint.

Device I have:
- Fingerprint TFT
- Alarm: Strop Light
- Sensor: Beam sensor

pictures below are each device diagram.

Please help to get this work.
I also develop software to control these.

High Resolution

Premium Member
19,556 Posts
This is very basic access control. Mostly off the shelf stuff here in the states.
Do you want local or remote alarm indicating?
Or will you want to open a cage and let a tiger out or something like that?

5,523 Posts
Simple logic:

A = Fingerprint Scanner output
B = Beam sensor
C = Relay
D = Acknowledge button
E = Alarm / strobe

If Not A and B then C
If Not D and C then C
If C then E

You need a relay that seals in through an Acknowledge push button so that the alarm is not a short little blast just as the person breaks the beam, then have the relay seal in through an Acknowledge button.

|-----]\[-------] [--- |---( )----|
|_____D_______C____|_______ |
|-----]\[-------] [--- |_______ |
|_____C________________E___ |
|-----] [-----------------( )----|
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