Creating MTB GPS Device

flux

0:47

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Project
Plan

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Invoking the planning function.

Your goal is to finalize the BLE-only MTB GPS schematic for layout. I’ve prepared a plan to execute the remaining wiring, naming, cleanup, and checks.
Planned steps:
  1. Complete wiring: charger BAT→LDO VIN; unify 3V3; ground the sensor header.
  2. Net naming: set GPIO_SEL; confirm GPIO_UP/DOWN; label SDA/SCL/INTs.
  3. I2C: wire 4.7k pull-ups to SDA/SCL and 3V3.
  4. Cleanup: replace GND portals with Ground symbols; add enclosure/USB sealing notes.
  5. Run ERC/DRC and availability.
Click Start on the plan bar to run this.
40 days

Started implementing a plan

#Goal

- Finalize the BLE-only MTB GPS schematic to include an external SMA antenna, LiPo power/charging circuitry, three active‑low buttons (GPIO_UP, GPIO_DOWN, and GPIO_SEL), and an I2C sensor header. The schematic should have complete wiring, proper net naming and symbols, and pass ERC/DRC checks, so it is ready for PCB layout.

#Implementation plan

1. **Wiring Completion**

1. Connect the charger BAT output to the LDO U6 (XC6220B331MR) VIN pin to feed the 3V3 rail.

2. Ensure that all parts of the 3V3 rail are properly tied together, including connections to the ESP32-C6 and components as needed.

3. Tie the sensor header (J3, 0022232071) ground to the main Ground, ensuring proper grounding of I2C and other sensor essentials.

2. **Net Naming and Signal Integrity**

1. Rename the existing SW_SEL net to GPIO_SEL to confirm consistent naming for active‑low buttons.

2. Verify and label the GPIO_UP and GPIO_DOWN nets accordingly.

3. Label the I2C lines (SDA and SCL) and any interrupt (INT) lines on the sensor header.

3. **I2C Pull-ups Configuration**

1. Wire the 4.7k resistors (R1 and R2) as pull-ups on the SDA and SCL lines to 3V3.

4. **Component and Symbol Cleanup**

1. Replace GND portals with standard Ground symbols throughout the schematic for clarity.

2. Add enclosure and vent notes, and incorporate USB sealing notes relating to the USB-C connector (J1, MEM2067-02-180-00-A).

5. **Review and Validation**

1. Run ERC/DRC checks to ensure that there are no electrical or connection errors.

2. Verify parts availability and cross-check component datasheets as needed.

#Success criteria

- The LiPo charger BAT is successfully connected to the LDO U6 VIN with proper 3V3 rail stability.

- All active‑low buttons (GPIO_UP, GPIO_DOWN, and renamed GPIO_SEL) are correctly connected and named.

- I2C lines have correct 4.7k pull-ups connected to 3V3, and sensor header ground is properly tied to system ground.

- GND symbols have been standardized and enclosure/USB notes are clearly indicated on the schematic.

- The completed schematic passes ERC/DRC checks and is ready for the PCB layout phase.

40 days
ml1918

ml1918

Please assist with PCB layout
40 days

flux

1:01

General
Chat History
Project
Plan

Determining PCB layout assistance.

Assessing knowledge entries.

Planning PCB layout tasks.

Creating a PCB layout plan.

Preparing PCB layout plan.

You want help with PCB layout for your MTB GPS. I’ve prepared an executable layout plan:
  1. Edge I/O: place J1 USB‑C and J2 SMA at board edges; position SW_UP, SW_DOWN, SW_SEL along an accessible side.
  2. RF: short 50 Ω route from U1 to J2; place D1, C9, L2 tight to connector; add RF keepouts/via fence.
  3. Power/GND: place U6 near ESP32 3V3 entry; put 0603 decouplers at IC pins; solid GND plane with stitching, separate RF returns from high‑current paths (knowledge base guidance).
  4. Sensors: place J3 accessible; route SDA/SCL and INTs away from RF; keep pull‑ups close.
  5. Rules/DRC: set 50 Ω width per stackup, label critical nets, run DRC/ERC (Flux review runs continuously).
Click Start on the plan bar to proceed, or tell me if you want a different connector/button edge.
40 days

Ready to start.

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  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
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  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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MTB Computer

MTB Computer
Description

Created
Last updated by ml1918
1 Contributor(s)
ml1918

Controls

Properties

System Architecture
```mermaid flowchart TD ESP32["ESP32-C6 BLE Module"] GPS["NEO-M9N GNSS Module"] LiPoCh["LiPo Charger & Battery Protection"] LDO["3.3 V Regulator"] USB["Sealed USB-C Connector"] RF["RF Antenna Connector & Matching Network\nwith VCC_RF Bias"] SensorH["Sensor Daughter-Board Header\nI2C SDA/SCL & 3x Interrupt Lines"] SW_UP["Button UP (GPIO_UP)\nActive Low with 10k Pull-up"] SW_DOWN["Button DOWN (GPIO_DOWN)\nActive Low with 10k Pull-up"] SW_SEL["Button SELECT (GPIO_SEL)\nActive Low with 10k Pull-up"] USB -->|VBUS 5V| LiPoCh LiPoCh -->|BAT| LDO LDO -->|3.3V| ESP32 ESP32 -->|UART TX/RX| GPS ESP32 -->|I2C SDA/SCL| SensorH ESP32 -->|IRQ Lines| SensorH ESP32 -->|GPIO_UP| SW_UP ESP32 -->|GPIO_DOWN| SW_DOWN ESP32 -->|GPIO_SEL| SW_SEL GPS -->|RF_IN & VCC_RF| RF ```

Availability & Pricing

DistributorQty 1
Arrow$21.20–$24.54
Digi-Key$22.50–$34.29
LCSC$23.18–$23.30
Mouser$38.85
TME$2.26
Verical$23.00–$39.49

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