make me a solar powered compass that'll sit on my...

brooks

brooks

make me a solar powered compass that'll sit on my FJ's dashboard. it'll use three 7 segment displays to read out the direction.

flux

I’ll design the solar-powered dashboard compass schematic from scratch: define the architecture, select library parts for the MCU/compass/display/power blocks, wire the circuit with required support passives, then run ERC review and fix issues before stopping at the schematic→layout checkpoint.

flux

I selected the main architecture: solar input → LiPo charge/power path → 3.3 V regulator → low-power MCU, I2C magnetometer, TM1637 display driver, and three single-digit 7-segment displays. I’m checking the IC datasheets now so the support passives and wiring are grounded in the manufacturers’ circuits.
Working for 1 day 5 hrs...
Reading ATSAMD10C13A-SS datasheet for ATSAMD10C13A pin table power supply pins.
Read LIS3MDLTR datasheet for LIS3MDLTR pinout I2C application circuit.
Read MCP73871 datasheet for MCP73871 typical application circuit sol.
Read MCP1700T-3302E-TT datasheet for MCP1700T-3302E-TT pinout input output ca.
Read TM1637 datasheet for TM1637 pinout typical application circui.
Reading "MCP1700T-3302E-TT pinout input output capacitor requirements ESR stability typical application circuit" in TT-Microchip-datasheet-532260.pdf.
Read TT-Microchip-datasheet-532260.pdf.
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Solar Dashboard Compass Project Specification
Goal
Design a solar-powered compass module intended to sit on an FJ dashboard and display heading as a three-character direction code on three 7-segment displays.
Assumptions
  • Direction display uses three alphanumeric-like 7-segment approximations for the 16 compass points: N, NNE, NE, ENE, E, ESE, SE, SSE, S, SSW, SW, WSW, W, WNW, NW, NNW.
  • Dashboard use implies high ambient temperature and sunlight exposure; components should be selected with automotive-adjacent temperature margin where practical.
  • Solar power charges a small LiPo cell/supervised energy store so the compass can run when light is low.
  • Logic rail target: 3.3 V.
  • Display brightness should be firmware-controlled to manage solar/battery power budget.
Planned Architecture
  1. Solar input and energy storage: small solar panel input, LiPo charger/power-path where available, battery connector, protection.
  2. 3.3 V system rail: low-power regulator with input/output capacitors per datasheet.
  3. MCU: low-power microcontroller to read compass over I2C and drive display interface.
  4. Compass sensor: 3-axis magnetometer on I2C with decoupling and pull-ups.
  5. Display subsystem: three 7-segment LED displays driven through a multiplexing/display-driver IC or current-limited MCU/driver arrangement.
  6. Programming/debug connector for firmware upload and calibration.
Validation Targets
  • Every IC wired per datasheet recommended circuit.
  • All power pins connected and decoupled.
  • I2C pull-ups present.
  • Display current limited and controllable.
  • ERC review clean before moving to PCB layout.

    Goal

    Assumptions

    Planned Architecture

    Validation Targets

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    Solar Dashboard Compass Project Specification

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Solar-powered vehicle dashboard compass with three 7-segment direction display

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