Laser Alarm Security Circuit
About the Laser Alarm Security Circuit PCB
Laser Alarm Security Circuit is an open source PCB design by JKCadilo14-CpE, published on GitHub under the MIT license. It is a 2-layer board measuring 50.8 × 45.7 mm, with 7 components from 7 distinct parts.
By type, the board carries 2 connectors, 2 resistors, 1 transistor, 1 buzzer and 1 diode.
From the project
Collection of electronic circuits I designed, tested, and documented using KiCad
A beginner-friendly laser-interruption alarm project using an LDR, BC547 transistor, LED, buzzer, and an external laser source for demonstration.
This project demonstrates an educational optical beam-interruption alarm. An external laser module projects a beam onto the LDR. The LDR and R2 form a light-dependent input condition for Q1. When the beam is interrupted, the LDR condition changes, Q1 responds, and D1/BZ1 provide visible and audible alarm indication.
Laser Alarm Security Circuit bill of materials (BOM)
7 components, 7 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BC547 | TO-92_Inline | Q1 |
| 1 | input | TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J1 |
| 1 | laser_input | TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J2 |
| 1 | Buzzer | Buzzer_15x7.5RM7.6 | BZ1 |
| 1 | LED | LED_D5.0mm | D1 |
| 1 | LDR03 | R_LDR_10x8.5mm_P7.6mm_Vertical | R1 |
| 1 | 10K ohms | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
Laser Alarm Security Circuit design files
The KiCad project lives in the JKCadilo14-CpE/DIY-Circuits repository on GitHub; these links point at the commit this page was built from.
Laser Alarm Security Circuit: common questions
How big is the Laser Alarm Security Circuit PCB?
The Laser Alarm Security Circuit measures 50.8 × 45.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Laser Alarm Security Circuit?
7 components, from 7 distinct parts. The full bill of materials is listed on this page.
Where can I download the Laser Alarm Security Circuit design files?
From the JKCadilo14-CpE/DIY-Circuits repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Laser Alarm Security Circuit design in my own project?
Yes, under the terms of its MIT license, which JKCadilo14-CpE chose for the repository.
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