2 layers19 × 76 mm
Sub
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
15 parts3kApache-2.0
2 layers60 × 54 mm
LF3 is a DIY line follower robot designed from scratch
- Size
- 60 × 54 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 37
- Pads
- 81
- Tracks, vias
- 124, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 7 Jul 2025
- Updated
- 23 Jan 2026
Overview
LF4 is an open-source printed circuit board by SendhanS, from the SendhanS/Linefollower-LF3 repository on GitHub, published under the MIT licence. It is a 2-layer board of 60 × 54 mm with 15 parts on 37 nets, routed with 124 tracks and 0 vias.
Its parts include 7 connectors, 2 diodes, 2 switches, 1 capacitor and 1 resistor. It belongs with the robots and motor control boards and the AVR (ATmega, ATtiny) boards of this library.
README
README.mdLF3 – Line Follower Robot (Modular PCB + Custom Chassis)
LF3 is a compact line follower robot designed with a custom PCB carrier board, N20 motors, and a chassis optimized for wired sensor integration. The design is focused on modularity and ease of assembly, allowing sensors to be externally mounted and replaced without soldering to the board.
📌 Key Features
- Microcontroller: Arduino Nano (inserted via female headers)
- Motor Driver: L293D onboard
- Motors: N20 gear motors
- Sensor Input: External sensor modules via header wires (IR array or similar)
- Chassis: Custom design made in SolidWorks, with an outline provided for easy fabrication
- Power Supply: 7.4V or 2-cell Li-ion battery, not more than 12V
📁 Files Included
LF3.ino– Main Arduino sketch for basic line followingMchassis.sldprt– SolidWorks part file of the chassisassembly.sldasm– Full assembly fileLF3– EasyEDA project file for the PCBschematic.png– Electrical schematic overviewchassis_outline.pdf– Printable chassis template*.gbr– Gerber files for PCB fabrication*.jpg/.png– Robot build and design reference images
📂 Purpose
This project was created as a practical robotics platform — simple enough for rapid prototyping, but structured to reflect real-world modularity. It’s well-suited for testing motor control, evaluating sensor placement strategies, and embedded programming using Arduino.
📝 License
This project is open-source under the MIT License.
👤 Author
Designed by Sendhan S
Feel free to fork, modify, or share feedback.
Connect with me on LinkedIn
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | Conn_01x08_Socket | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J1, J2 |
| 2 | SW_Push | Button_Switch_SMD:SW_Tactile_SPST_NO_Straight_CK_PTS636Sx25SMTRLFS | SW1, SW2 |
| 1 | 1N5822 | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D1 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R5 |
| 1 | 470uf | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C2 |
| 1 | Arduino_Nano_v2.x | Module:Arduino_Nano | A1 |
| 1 | Conn_01x11_Pin | Connector_PinSocket_2.54mm:PinSocket_1x11_P2.54mm_Vertical | J6 |
| 1 | HC05 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J7 |
| 1 | LED | LED_THT:LED_D3.0mm | D3 |
| 1 | LOGO | LOGO | G*** |
| 1 | MOTOR A | TerminalBlock:TerminalBlock_Xinya_XY308-2.54-2P_1x02_P2.54mm_Horizontal | J4 |
| 1 | MOTOR B | TerminalBlock:TerminalBlock_Xinya_XY308-2.54-2P_1x02_P2.54mm_Horizontal | J5 |
| 1 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_Xinya_XY308-2.54-2P_1x02_P2.54mm_Horizontal | J3 |
Questions
How big is the LF4 PCB?
It measures 60 × 54 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LF4 use?
15 parts. 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 LF4 KiCad files?
From the SendhanS/Linefollower-LF3 repository on GitHub, at the commit this page was made from: the board is LF4/LF4.kicad_pcb and its schematic LF4/LF4.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LF4 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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