LED CIRCUIT

3-LED Indicator Circuit PCB

A compact 3-LED indicator circuit PCB designed in KiCad. The board is intended as a simple electronics/PCB-design project for demonstrating LED indication, current limiting, connector interfacing, schematic capture, PCB layout, routing, and design-rule checking.

Project Overview

The PCB contains three independent LED indicator channels. Each LED is paired with a 1 kΩ current-limiting resistor and the board includes a 1×4, 2.54 mm pitch pin header for external connections.

Main Features

• 3 × 3 mm through-hole LEDs
• 3 × 1 kΩ current-limiting resistors
• 1 × 1×4, 2.54 mm horizontal pin header
• Through-hole component assembly
• KiCad schematic and PCB design
• Suitable for basic status/power indication and PCB-design practice

Bill of Materials

A detailed procurement-ready BOM is included as 3_LED_Circuit_BOM.xlsx and 3_LED_Circuit_BOM.csv.

Component-selection note: The supplied source BOM does not specify LED color, resistor power rating, manufacturer part numbers, or suppliers. These fields are intentionally marked as To be selected / Not specified rather than inventing part numbers.

Circuit Operation

Each LED is connected with its own series resistor. The resistor limits LED current and protects the LED from excessive current.

The approximate resistor value is:

R = (VCC - VF) / I_LED

For this project, the schematic uses 1 kΩ resistors. Confirm the actual supply voltage and LED forward voltage before assembly.

PCB Design Workflow

The PCB was designed using KiCad following this workflow:

1. Schematic capture
2. Component and footprint selection
3. Electrical connections
4. PCB layout
5. Component placement
6. Track routing
7. Design Rule Check (DRC)
8. Gerber generation

Project Structure

3-LED-Circuit/
├── 3_LED_Circuit.kicad_pro
├── 3_LED_Circuit.kicad_sch
├── 3_LED_Circuit.kicad_pcb
├── 3_LED_Circuit_BOM.xlsx
├── 3_LED_Circuit_BOM.csv
├── gerbers/
│   ├── copper/
│   ├── soldermask/
│   ├── silkscreen/
│   └── drill/
└── README.md

Applications

• LED status indication
• Power indication
• Embedded-system prototypes
• Basic electronics demonstrations
• PCB design practice
• KiCad learning projects

Tools Used

• KiCad
• Schematic Editor
• PCB Editor
• Design Rules Checker (DRC)
• Gerber Viewer

Project Status

• Schematic: Completed
• PCB Layout: Completed
• Component placement: Completed
• Routing: Completed
• BOM: Prepared
• Gerber generation: Ready

Author

Manideep Kolluri

Electronics / Embedded Systems