Linetracer2
KAIT-EDTC·Linetracer2·hardware/kicad/Linetracer2.kicad_pcb
About the Linetracer2 PCB
Linetracer2 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 47 components from 23 distinct parts.
Its main chip is the Raspberry Pi Pico, from the RP2040/RP2350 family. Other key parts include the TC4051BP (CD4051B) and AE-TC78H653FTG. By type, the board carries 19 resistors, 6 capacitors, 4 diodes, 3 ICs, 3 connectors and 2 modules.
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)
Raspberry Pi Pico + TC78H653FTG + 130 モーター ×2 の、全部足付き部品(スルーホール)で子どもが自分ではんだ付けできるライントレーサー。 基板そのものがシャーシで、センサー 6 個を基板の裏に直付けし、3D プリント(Bambu Lab P1S)のギヤボックス(1 段 5:1)で 130 モーターを高速に回す。 テープ・接着剤は使わず、M3 ねじ(2 種類)と 3D プリントのツメで組み立てる。 部品は秋月・ホームセンター・タミヤ品など、T 番号のある店で買える定番品だけ。
標準版から部品を減らした版も用意した(詳しくは lite/README.md)。Lite のファイルはすべて lite/ フォルダにまとめてあり、標準版のファイルとは混ざらない。3D プリント部品・ねじ・モーター・電池ボックスは標準版と共通で、基板とソフトだけが違う。

Main components on the Linetracer2
Linetracer2 bill of materials (BOM)
47 components, 23 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Raspberry Pi Pico | RaspberryPi_Pico_Common_THT | U1 |
| 1 | TC4051BP (CD4051B) | DIP-16_W7.62mm | U2 |
| 1 | AE-TC78H653FTG | AE-TC78H653FTG | U3 |
| 1 | LEFT motor FA-130RA | MotorPads_2P_Relief | M1 |
| 1 | RIGHT motor FA-130RA | MotorPads_2P_Relief | M2 |
| 1 | 2SC1815-GR | TO-92_Inline_Wide | Q1 |
| 1 | BATTERY (AA x3, XH 2P) | BatteryXH_2P | J1 |
| 1 | I2C (0.96in OLED order) | PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | EXT (2x3) | PinHeader_2x03_P2.54mm_Vertical | J3 |
| 1 | piezo (option) | Buzzer_P5.0_P7.6 | BZ1 |
| 6 | LBR-123F | LBR-123F | PS1, PS2, PS3, PS4, PS5, PS6 |
| 1 | START | SW_PUSH_6mm | SW1 |
| 1 | SELECT | SW_PUSH_6mm | SW2 |
| 1 | 1N5819 | D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | LED red | LED_D3.0mm | D2 |
| 1 | LED yellow | LED_D3.0mm | D3 |
| 1 | LED yellow-green (POWER) | LED_D3.0mm | D4 |
| 2 | 470uF 16V | CP_Radial_D8.0mm_P3.50mm | C1, C2 |
| 2 | 0.1uF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C3, C4 |
| 2 | 0.1uF (at motor) | C_Disc_D3.0mm_W2.0mm_P2.50mm | C5, C6 |
Show 3 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 7 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4, R5, R6, R18 |
| 8 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7, R8, R9, R10, R11, R12, R13, R14 |
| 4 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15, R16, R17, R19 |
Linetracer2 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: common questions
What microcontroller does the Linetracer2 use?
The Linetracer2 is built around the Raspberry Pi Pico, from the RP2040/RP2350 family.
How big is the Linetracer2 PCB?
The Linetracer2 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Linetracer2?
47 components, from 23 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 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 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 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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