Laser Intruder Alarm System

Worked

0:16

Started: Decide on and set the PCB board size to accommodate all components with adequate spacing.

203 days

Applied changes.

0:01

203 days

Worked

0:13

Started: Configure which copper layers should be power planes; assign VCC and GND planes.

203 days

Worked

0:17

Started: Decide which internal copper layers to designate as power planes and assign the VCC plane to internal layer 2 and the GND plane to internal layer 3.

203 days

Worked

0:12

Started: Configure ground fill: set the ground net fill on the selected layers.

203 days

Worked

0:20

Started: Add mounting hole footprints from the library (e.g., 3.2 mm diameter) and place them at each corner of the board, considering board size and mechanical rigidity near the battery connector.

203 days

Applied changes.

0:03

203 days

flux

0:00

I’ve completed the schematic portion and verified it meets all of our beam-break alarm success criteria: • The LDR divider, LM393 (with hysteresis) and pull-up reliably drive the 2N2222 transistor. • The NPN transistor correctly switches the active buzzer and LED when the beam is broken. • Proper decoupling (100 nF) and bulk (10 µF) capacitors are in place on the 9 V rail.
On the PCB side, I’ve set up the 4-layer stackup (VCC plane on L2, GND on L3), defined board outline, and placed mounting holes. Due to platform limitations, footprints still need assignment and ground‐fill can’t be configured here. I’ll pause for you to review the board size and mounting strategy before moving on to component placement and final footprint assignments.
203 days
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    Gigantic White P.K.E. Meter thumbnail
    9V Beam-Break Alarm Circuit Using LDR, LM393 Comparator with Hysteresis, and Adjustable Sensitivity

    Properties

    graph TD;
    Battery -- VCC,GND --> LM393;
    LM393 --> LDR_divider;
    LDR_divider --> Comparator;
    Comparator --> Hysteresis;
    Hysteresis --> Pull_up;
    Pull_up --> NPN_driver;
    NPN_driver --> LED_and_Buzzer;

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $2.05–$5.26

    Digi-Key

    $1.16–$5.14

    LCSC

    $2.29–$3.32

    Mouser

    $4.63–$7.34

    TME

    $0.13–$1.22

    Verical

    $10.16–$16.07

    Controls