2 layers62.1 × 82.5 mm
ControlBoard
wadengroff/Junior_Design
This repository holds all source files and CAD models (mechanical and electrical) to create a line-following robot used as an educational resource for children ages 8-10.
26 parts
2 layers52.5 × 23 mm
Thomas
wadengroff/Junior_DesignThis repository holds all source files and CAD models (mechanical and electrical) to create a line-following robot used as an educational resource for children ages 8-10.
- Size
- 52.5 × 23 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 11
- Pads
- 39
- Tracks, vias
- 106, 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Jan 2026
- Updated
- 8 Apr 2026
Overview
Thomas is an open-source printed circuit board by wadengroff, from the wadengroff/Junior_Design repository on GitHub. It is a 2-layer board of 52.5 × 23 mm with 15 parts on 11 nets, routed with 106 tracks and 6 vias.
It is built around the LM393 and IR204-A-L. Its parts include 6 resistors, 4 diodes, 2 transistors, 1 IC and 1 connector.
Main components
2README
README.mdJunior_Design Project
Thomas the Line-Following Tank Engine
This repository holds all source files and CAD models (mechanical and electrical) to create a line-following robot used as an educational resource for children ages 8-10.
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 20k | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2, R4 |
| 2 | 220 | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5, R6 |
| 2 | 220 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R3 |
| 2 | BPW40 | LED_THT:LED_D5.0mm_Clear | Q1, Q2 |
| 2 | IR204A | LED_THT:LED_D3.0mm_IRBlack | D1, D2 |
| 2 | LED | LED_THT:LED_D3.0mm | D3, D4 |
| 1 | 10k_pot | Potentiometer_THT:Potentiometer_ACP_CA9-H5_Horizontal | RV1 |
| 1 | Conn_01x04 | Connector_JST:JST_PH_S4B-PH-K_1x04_P2.00mm_Horizontal | J2 |
| 1 | LM393 | LM339N:DIP794W45P254L959H508Q8 | U1 |
Questions
How big is the Thomas PCB?
It measures 52.5 × 23 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Thomas use?
15 parts, built around the LM393 and IR204-A-L. 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 Thomas KiCad files?
From the wadengroff/Junior_Design repository on GitHub, at the commit this page was made from: the board is pcb/senseBoard/thomas.kicad_pcb and its schematic pcb/controlBoard/controlBoard/controlBoard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Thomas design in my own project?
Its repository states no licence, so its author keeps all rights: ask wadengroff before reusing the design.
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