2 layers22.1 × 20 mm
6XEG
Reisi/The_Helen_Project
The Helen Project is a firmware platform for bicycle lights. It features
23 parts1BSD-2-Clause
4 layers29 × 18 mm
KD2 10
Reisi/The_Helen_Project1The Helen Project is a firmware platform for bicycle lights. It features
- Size
- 29 × 18 mm
- Copper layers
- 4
- Thickness
- 0.8 mm
- Parts
- 58
- Nets
- 41
- Pads
- 150
- Tracks, vias
- 291, 53
- Pours
- 13
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 21 Nov 2022
- Updated
- 22 Jun 2025
Overview
KD2 10 is an open-source printed circuit board by Reisi, from the Reisi/The_Helen_Project repository on GitHub, published under the BSD-2-Clause licence. It is a 4-layer board of 29 × 18 mm with 58 parts on 41 nets, routed with 291 tracks and 53 vias.
It is built around the E104-BT5032A, ZXCT1009FTA and BMI160, with the SE8530X2-HF, AO3400A and BAV99 among its other parts. Its parts include 14 resistors, 12 capacitors, 9 connectors, 5 diodes and 4 ICs.
Main components
7
E104-BT5032A
SMD,16x11.5mm-40℃~+85℃ -96dBm 13mA 13mA 3.3V 3.8dBm 70m Bluetooth 5.0 nRF52832 Chip SMD,16x11.5mm Bluetooth Modules ROHSChengdu Ebyte Elec TechBluetooth Modules
ZXCT1009FTA
SOT-23-40℃~+85℃ 1 100nA 2.5V~20V 2.5V~20V 25mA 300kHz 4uA High-side detection ±2.5V SOT-23 Current Sense Amplifiers ROHSDiodes IncorporatedCurrent Sense Amplifiers
BMI160
LGA-14(2.5x3)-40℃~+85℃ 1.71V~3.6V 10uA 16bit 1KB IMU (accelerometer + gyroscope) Motion event detection、Synchronization and timestamp SPI、I2C X,Y,Z X,Y,Z ±16g ±2000dps LGA-14(2.5x3) Accelerometers ROHSBosch SensortecAccelerometersSE8530X2-HF
SOT-23-20℃~+85℃ 1 2.5uA 200mA 300mV@(100mA) 35V 3V 80dB Fixed Positive Under Voltage Lockout、Over Temperature Protection、Enable、Short Circuit Protection SOT-23 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSeaward ElecVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsAO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsBAV99
SOT-231 Pair Series Connection 1.25V@150mA 100V 215mA 250mW 4A 4ns 500nA@80V SOT-23 Switching Diodes ROHSNexperiaSwitching Diodes
SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdHelen
The Helen Project is a firmware platform for bicycle lights. It features
- up to 8 modes, each individually configurable
- the modes can be split into groups
- support for remote control connected over BLE
- mode and group configurations with The Helen App
- light-to-light connections with mode synchronization
Currently there are two devices:
- Helen, an alternative electronic circuit for the Yinding or KD2 headlight cycling lamps
- Drake, a multi-purpose PCB, which can be used to build a rear light or a dropper post actuator
License
This project is licensed under the BSD-2-clause License - see the license.txt file for details
Parts
58| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | Conn_01x01 | rt_pins:1,5x3mm_SMD | J1, J2, J4, J5, J6, J7, J8 |
| 6 | 100n | drv:C_0603_1608Metric | C1, C4, C6, C7, C8, C11 |
| 3 | 10 | drv:R_0603_1608Metric | R4, R12, R13 |
| 3 | 10u/25V | Capacitor_SMD:C_0805_2012Metric | C3, C5, C12 |
| 3 | 47k | drv:R_0603_1608Metric | R5, R10, R14 |
| 3 | 4k7 | drv:R_0603_1608Metric | R2, R3, R11 |
| 3 | 4µ7/16V | drv:C_0603_1608Metric | C2, C9, C10 |
| 2 | 820 | drv:R_0603_1608Metric | R6, R8 |
| 2 | AO3400A | drv:SOT-23_AO3400A | Q1, Q3 |
| 2 | Ferrite_Bead_Small | Inductor_SMD:L_0603_1608Metric | FB1, FB2 |
| 1 | 120 | drv:R_0603_1608Metric | R7 |
| 1 | 1M | drv:R_0603_1608Metric | R9 |
| 1 | 1k5 | drv:R_0603_1608Metric | R1 |
| 1 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | 3µ-18 | drv:SWPA6045S | L1 |
| 1 | 4(10)pin_ARM | drv:4(10)pin_ARM_SWD | J9 |
| 1 | 5v6 | Diode_SMD:D_SOT-23_ANK | D5 |
| 1 | BAV99 | Package_TO_SOT_SMD:SOT-23 | D2 |
| 1 | BMI160 | Package_LGA:Bosch_LGA-14_3x2.5mm_P0.5mm | U1 |
| 1 | Conn_01x06 | Connector_PinHeader_2.00mm:PinHeader_1x06_P2.00mm_Vertical | J3 |
| 1 | E104-BT5032A | rt_modules:E104-BT5032A | U2 |
| 1 | LED_BLUE | drv:LED_0603_1608Metric | D3 |
| 1 | LED_RED | drv:LED_0603_1608Metric | D4 |
| 1 | LOGO | drv:logo | G*** |
| 1 | SE8530X2-HF | drv:SOT-23_MCP1703 | U4 |
| 1 | SS34 | Diode_SMD:D_SMA | D1 |
| 1 | SW_Push | rt_button:JTP-1138EM | SW1 |
| 1 | ZXCT1009F | Package_TO_SOT_SMD:SOT-23 | U3 |
The 52 most common of 58 parts.
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Questions
How big is the KD2 10 PCB?
It measures 29 × 18 mm and has 4 copper layers, 0.8 mm thick.
What parts does the KD2 10 use?
58 parts, built around the E104-BT5032A, ZXCT1009FTA, BMI160 and SE8530X2-HF. 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 KD2 10 KiCad files?
From the Reisi/The_Helen_Project repository on GitHub, at the commit this page was made from: the board is Hardware/KD2_10/KD2_10.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the KD2 10 design in my own project?
Its repository publishes it under the BSD-2-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).