2 layers327.9 × 139 mm
Coco2
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
147 parts446
2 layers88.1 × 72 mm
Light Sensor LED
rocketblaster/Light-Sensor-LEDProject for Resolution Hardware Week 4
- Size
- 88.1 × 72 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 14
- Pads
- 37
- Tracks, vias
- 42, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 5 Apr 2026
- Updated
- 18 Apr 2026
Overview
Light Sensor LED is an open-source printed circuit board by rocketblaster, from the rocketblaster/Light-Sensor-LED repository on GitHub. It is a 2-layer board of 88.1 × 72 mm with 13 parts on 14 nets, routed with 42 tracks and 0 vias.
It is built around the NE555P. Its parts include 6 resistors, 2 capacitors, 2 diodes, 1 IC and 1 connector. It belongs with the sensors and measurement boards of this library.
Main components
1README
README.mdLight Sensor LED
This circuit contained a LDR or photo cell. When the photo resistor detects light the 555 timer turns on and the LED turns on as a result. When it is covered or it is dark, the LED turns off.
Features
- The board contains a light depedent resistor (LDR) or a photo resistor.
- It senses how much light is coming and proceeds to activate the 555 timer as it is connected to pin 8, VCC of the 555 timer.
- Potentiometer adjusts the light sensitivity.
Schematic
PCB
BOM
| Designator | Value |
|---|---|
| R1 | 10K |
| R2 | 22k |
| R3 | 4.7k |
| R4 | LDR |
| R5 | 330 |
| R6 | 330 |
| C1 | 0.1uF |
| C2 | 0.01uF |
| U1 | NE555 |
| RV1 | 100k |
| D1 | LED |
| D2 | LED |
Assembly / Usage
Best to assemble smaller parts first. Resistor, then capacitator, LEDs, and potentiometer. I would do the USB connector port last. Since I only put in the designator values, R1 is 10k, R2 is 22k, R3 is 4.7k, R3 is the LDR, R5 and R6 are 330 ohm resistor. For capacitor, C1 is 0.1u and C2 is 0.01u, and LED can be any color but red would be better to make the bird evil.
The LDR does not need to be soldered in flush mostly because the shadows from other components make it go to one state sometimes. Shouldn't be that much of an issue though.
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 330 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R5, R6 |
| 2 | LED | LED_THT:LED_D5.0mm | D1, D2 |
| 1 | 0.01u | Capacitor_THT:C_Disc_D8.0mm_W5.0mm_P5.00mm | C2 |
| 1 | 0.1u | Capacitor_THT:C_Disc_D8.0mm_W5.0mm_P5.00mm | C1 |
| 1 | 100k | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | RV1 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | 22k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2 |
| 1 | 4.7k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3 |
| 1 | LDR | OptoDevice:R_LDR_4.9x4.2mm_P2.54mm_Vertical | R4 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | USB_A | Connector_USB:USB_A_Molex_67643_Horizontal | J1 |
Questions
How big is the Light Sensor LED PCB?
It measures 88.1 × 72 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Light Sensor LED use?
13 parts, built around the NE555P. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Light Sensor LED KiCad files?
From the rocketblaster/Light-Sensor-LED repository on GitHub, at the commit this page was made from: the board is src/kicad/Light Sensor LED.kicad_pcb and its schematic src/kicad/Light Sensor LED.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Light Sensor LED design in my own project?
Its repository states no licence, so its author keeps all rights: ask rocketblaster before reusing the design.
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