Light-Activated Switch
About the Light-Activated Switch PCB
Light-Activated Switch is an open source PCB design by JKCadilo14-CpE, published on GitHub under the MIT license. It is a 2-layer board measuring 61 × 35.6 mm, with 6 components from 6 distinct parts.
By type, the board carries 2 diodes, 2 resistors, 1 transistor and 1 connector.
From the project
Collection of electronic circuits I designed, tested, and documented using KiCad
A beginner-friendly photodiode and transistor switching project that uses light at the sensor input to control an LED output.
This project demonstrates a simple light-activated transistor switch. A photodiode provides the light-sensitive input, a BC547 transistor responds to the sensor condition, and an LED provides the visible output indication.
The project was built to help beginners study sensor polarity, transistor orientation, resistor verification, and the effect of ambient lighting on a simple optical switching circuit. It is an educational prototype, not a calibrated light meter or…
Light-Activated Switch bill of materials (BOM)
6 components, 6 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 | D_Photo | LED_D5.0mm_IRBlack | D1 |
| 1 | LED | LED_D5.0mm | D2 |
| 1 | 420 ohms | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 10k ohms | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
Light-Activated Switch 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.
Light-Activated Switch: common questions
How big is the Light-Activated Switch PCB?
The Light-Activated Switch measures 61 × 35.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Light-Activated Switch?
6 components, from 6 distinct parts. The full bill of materials is listed on this page.
Where can I download the Light-Activated Switch 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 Light-Activated Switch design in my own project?
Yes, under the terms of its MIT license, which JKCadilo14-CpE chose for the repository.
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