2 layers76.4 × 63.3 mm
InfraRedGelUniversalDispenser
abdontroche/InfraRed_Gel_Universal_Dispenser
This project pretends to be a open source device that could help people fighting against the COVID-19.
20 parts5CC0-1.0
2 layers42 × 16.4 mm
Light Sensor
Manideep136/Light-SensorThis project is a Light Sensor circuit based on an LDR (Light Dependent Resistor) and an operational amplifier.
- Size
- 42 × 16.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 7
- Nets
- 9
- Pads
- 22
- Tracks, vias
- 41, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 26 Sep 2026
- Updated
- 28 Sep 2026
Overview
Light Sensor is an open-source printed circuit board by Manideep136, from the Manideep136/Light-Sensor repository on GitHub. It is a 2-layer board of 42 × 16.4 mm with 7 parts on 9 nets, routed with 41 tracks and 0 vias.
It is built around the LM358P. Its parts include 3 resistors, 1 IC, 1 diode and 1 connector. It belongs with the sensors and measurement boards of this library.
Main components
1README
README.mdLight-Sensor
Overview
This project is a Light Sensor circuit based on an LDR (Light Dependent Resistor) and an operational amplifier.
The circuit detects changes in the surrounding light intensity using an LDR. The changing resistance of the LDR is converted into a voltage variation, which is then processed by the op-amp circuit.
The schematic and PCB were designed using KiCad.
Features
- LDR-based light sensing
- Op-amp based signal processing
- Adjustable light detection
- Custom PCB design
- KiCad schematic
- KiCad PCB layout
- Gerber files for PCB manufacturing
- 3D PCB visualization
How It Works
An LDR (Light Dependent Resistor) changes its resistance depending on the amount of light falling on it.
- In bright light, the resistance of the LDR decreases.
- In darkness, the resistance of the LDR increases.
The LDR is combined with a resistor to form a voltage divider. The voltage produced by this divider changes according to the surrounding light level.
This changing voltage is supplied to the op-amp circuit, which processes the signal and provides the required output.
Main Components
| Component | Purpose |
|---|---|
| LDR | Detects surrounding light intensity |
| Op-Amp | Processes and compares the sensor voltage |
| Resistors | Voltage division and biasing |
| Capacitors | Filtering and signal stability |
| Potentiometer | Adjusts the detection threshold |
| Connectors | Power and output connections |
Circuit
The main parts of the circuit are:
- LDR light sensing section
- Voltage divider
- Op-amp section
- Threshold adjustment
- Power supply section
- Output section
PCB Design
The PCB was designed using KiCad.
The design process includes:
- Creating the schematic
- Selecting the required components
- Assigning footprints
- Creating the PCB layout
- Placing components
- Routing PCB tracks
- Checking the PCB design
- Running Design Rules Check (DRC)
- Generating Gerber files
- Viewing the PCB in 3D
Software Used
- KiCad
- KiCad Schematic Editor
- KiCad PCB Editor
- KiCad 3D Viewer
Project Structure
LDR-Light-Sensor/
│
├── doc/
│ ├── Schematic.png
│ ├── Layout.png
│ └── 3D_View.png
│
├── gerber/
│ ├── *.gbr
│ └── *.drl
│
├── LDR Light Sensor.kicad_pro
├── LDR Light Sensor.kicad_sch
├── LDR Light Sensor.kicad_pcb
│
└── README.mdParts
7| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1 |
| 1 | 200k | Potentiometer_THT:Potentiometer_Bourns_3266W_Vertical | RV1 |
| 1 | 330 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R3 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal | J1 |
| 1 | LDR07 | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | R2 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | LM358P | LM358P:DIP794W45P254L959H508Q8 | U1 |
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Questions
How big is the Light Sensor PCB?
It measures 42 × 16.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Light Sensor use?
7 parts, built around the LM358P. 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 KiCad files?
From the Manideep136/Light-Sensor repository on GitHub, at the commit this page was made from: the board is Light sensor/Light sensor.kicad_pcb and its schematic Light sensor/Light sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Light Sensor design in my own project?
Its repository states no licence, so its author keeps all rights: ask Manideep136 before reusing the design.