HardLabs

Linetracer2-Lite

KAIT-EDTC·Linetracer2·lite/hardware/kicad/Linetracer2-Lite.kicad_pcb

Linetracer2-Lite PCB layout, top view — open source RP2040/RP2350 board by KAIT-EDTC

About the Linetracer2-Lite PCB

Linetracer2-Lite is an open source RP2040/RP2350 PCB design by KAIT-EDTC, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 24 components from 15 distinct parts.

Its main chip is the Raspberry Pi Pico, from the RP2040/RP2350 family. Other key parts include the AE-TC78H653FTG. By type, the board carries 8 resistors, 4 capacitors, 2 ICs, 2 modules, 2 diodes and 1 transistor.

From the project

子ども向け教材ライントレーサー（Raspberry Pi Pico + TC78H653FTG + 130モーター、全部スルーホール・ねじ止め・3Dプリント）

2026-10-05 の依頼: 「低コスト版を作って。ピンヘッダを付けない／センサーを 3 つに（アナログマルチプレクサいらなくなるかも）／ブザーなし／O リングなしで今ある TPU で作った O リング（タイヤ）を使う／LED 1 個／ボタン 1 個。どれくらい安くなったかも」

- アナログマルチプレクサ（TC4051BP）は不要になった。Pico の外部 ADC はちょうど 3 本（GP26/27/28）なので、センサー 3 個を 1 本ずつ直結した。 - その代わり ADC が全部埋まるので、電池電圧の分圧回路（R13/R14/C3）も外し、Pico の基板の中にある「VSYS/3 → GP29」で測る（§3.2）。 - 安くなるのは主に「センサー 3 個分 ¥120」「O リング ¥80（TPU 代を引いて −¥65）」「LED・ボタン・コンデンサ・抵抗 ¥75」「ピンヘッダ ¥35」「4051 ¥15」。

Linetracer2-Lite, from the project README
From the project README

Main components on the Linetracer2-Lite

Raspberry Pi PicoAE-TC78H653FTG

Linetracer2-Lite bill of materials (BOM)

24 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
Raspberry Pi Pico
U1
1
AE-TC78H653FTG
U2
1
LEFT motor FA-130RA
M1
1
RIGHT motor FA-130RA
M2
1
2SC1815-GR
Q1
1
BATTERY (AA x3, XH 2P)
J1
3
LBR-123F
PS1, PS2, PS3
1
START
SW1
1
1N5819
D1
1
LED red
D2
2
470uF 16V
C1, C2
2
0.1uF (at motor)
C3, C4
3
100
R1, R2, R3
3
10k
R4, R5, R6
2
1k
R7, R8

Linetracer2-Lite design files

The KiCad project lives in the KAIT-EDTC/Linetracer2 repository on GitHub; these links point at the commit this page was built from.

Linetracer2-Lite: common questions

What microcontroller does the Linetracer2-Lite use?

The Linetracer2-Lite is built around the Raspberry Pi Pico, from the RP2040/RP2350 family.

How big is the Linetracer2-Lite PCB?

The Linetracer2-Lite measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Linetracer2-Lite?

24 components, from 15 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Linetracer2-Lite design files?

From the KAIT-EDTC/Linetracer2 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Linetracer2-Lite design in my own project?

The repository has no license, so all rights stay with KAIT-EDTC. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Linetracer2-Lite without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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