# Hollow Moccasin Lightcycle ## Description Welcome to your new project. Imagine what you can build here. ## Project Details - **Owner:** bridigitalexpo - **Created:** 2/10/2026 - **Last Updated:** 3/19/2026 - **Visibility:** Public - **System Architecture:** flowchart TD subgraph PowerCore[Power Core] BATT[LiPo Battery] --> BOOST[Boost Converter U3] BOOST -->|5V_MAIN| RAIL5V[5V Main Rail] BOOST -->|GND| GNDRAIL[GND Rail] end subgraph MCU[Microcontroller] RAIL5V --> XIAO5V[XIAO U1 5V] GNDRAIL --> XIAOGND[XIAO U1 GND] U13V3[XIAO U1 3V3] -->|3V3_SENSOR| RAIL3V3[3V3 Sensor Rail] end subgraph MicroSD[MicroSD SPI] RAIL5V --> SDVCC[MicroSD VCC] GNDRAIL --> SDGND[MicroSD GND] XIAOSPI[XIAO SPI Pins] --> SDSPI[SD SPI Signals] end subgraph SEN66[SEN66 I2C] RAIL3V3 --> SENVCC[SEN66 VCC] GNDRAIL --> SENGND[SEN66 GND] XIAOI2C[XIAO I2C Pins] --> SENI2C[SEN66 SDA SCL] end subgraph GPS[NEO6M UART] RAIL3V3 --> GPSVCC[GPS VCC] GNDRAIL --> GPSGND[GPS GND] XIAOUART[XIAO UART Pins] --> GPSUART[GPS TX RX] end subgraph Protection[Protective Capacitors] RAIL5V --> C470[470uF Bulk near SD] RAIL3V3 --> C0P1A[0.1uF near XIAO] RAIL3V3 --> C0P1B[0.1uF near GPS] GNDRAIL --> C470 GNDRAIL --> C0P1A GNDRAIL --> C0P1B end - **Copies:** 1 ## Key Components ### Breakout board - SEN66 — [Pin Header 01x05 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x05-254mm-vertical.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### J5 — [Pin Header 01x01 2.54mm Vertical - Circular Pad](https://www.flux.ai/markwuflux/pin-header-01x01-2p54mm-vertical-circular-pad.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - P1 [pin 1] ### J6 — [Pin Header 01x01 2.54mm Vertical - Circular Pad](https://www.flux.ai/markwuflux/pin-header-01x01-2p54mm-vertical-circular-pad.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - P1 [pin 1] ### MicroSD pins — [Connector 01x06](https://www.flux.ai/jharwinbarrozo/connector-01x06.md) - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### U1 — [Seeed Studio XIAO nRF52840 Sense](https://www.flux.ai/seeedstudio/seeed-studio-xiao-nrf52840-sense.md) - Manufacturer Name: seeed studio - Manufacturer Part Number: 102010469 - Purchase Url: https://www.seeedstudio.com/Seeed-XIAO-BLE-Sense-nRF52840-p-5253.html - Datasheet URL: https://files.seeedstudio.com/wiki/XIAO-BLE/nRF52840_PS_v1.5.pdf - Part Type: Microcontroller **Pins:** - 3V3 [pin 12] - 5V [pin 14] - D10_MOSI_P1.15 [pin 11] - D7_RX_P1.12 [pin 8] - D8_SCK_P1.13 [pin 9] - D9_MISO_P1.14 [pin 10] - GND [pin 13] - P0.02_A0_D0 [pin 1] - P0.03_A1_D1 [pin 2] - P0.04_SDA_A4_D4 [pin 5] - P0.05_SCL_A5_D5 [pin 6] - P0.28_A2_D2 [pin 3] - P0.29_A3_D3 [pin 4] - P1.11_TX_D6 [pin 7] ### U3 — [Type-C USB 5V 2A Step-Up Boost Converter](https://www.flux.ai/gokux/type-c-usb-5v-2a-step-up-boost-converter.md) **Pins:** - 5V - BAT- - BAT+ - GND - K ### U4 — [GY-neo6mv2_mod](https://www.flux.ai/shaw/gy-neo6mv2mod.md) **Pins:** - GND [pin 4] - RX [pin 2] - TX [pin 3] - VCC [pin 1] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/bridigitalexpo/hollow-moccasin-lightcycle](https://www.flux.ai/bridigitalexpo/hollow-moccasin-lightcycle).* --- *Generated from [https://www.flux.ai/bridigitalexpo/hollow-moccasin-lightcycle](https://www.flux.ai/bridigitalexpo/hollow-moccasin-lightcycle)*