Retro LCD Dashboard Design

Worked

0:11

flux

Work completed:
  • Project description updated to "USB-C Powered 3-Axis Digital Compass Module with MAX7219 7-Segment Display (Compass-Only, Automotive Use)"
  • System architecture property revised to show only STM32 (U2), BMM150 (U5), MAX7219 (U3) driving displays U6–U8, power chain (U1, D3, D4, F1, U15), and brightness pot (SW1)
  • Removed U9–U14, U16/U17 and their passives, U4 (BMA280), and J1
  • Severed ONE_WIRE net and all orphaned SPI-CS and segment nets
  • Verified I2C pull-ups remain for U5
  • Restored connections: U3→U6–U8 segments, USB-C power chain (VBUS→3V3), SW1→PA6 & GND, and mounting holes cleared of nets
Success criteria met:
  • Only compass-relevant parts remain
  • All extraneous components and nets removed
  • Single SPI CS on U3 and valid I2C pull-ups present
  • Metadata reflects compass-only design
Next step: Prepare the design for PCB layout, starting with footprint review and stackup configuration.
U9
U10
U11
SW1
U14
U6
U12
U13
U8
U7
U5
J1
C2
Capacitance
10 µF
C12
Capacitance
0.1µF
Hole1
C8
Capacitance
0.1µF
Hole7
U15
Hole8
C7
Capacitance
10µF
U1
Hole5
C4
Capacitance
0.1 µF
C3
Capacitance
0.1 µF
Hole4
C11
Capacitance
10 µF
Hole6
C1
Capacitance
1 µF
Hole2
C13
Capacitance
10µF
C6
Capacitance
0.1µF
C5
Capacitance
0.1 µF
C9
Capacitance
10µF
C10
Capacitance
0.1 µF
Hole3
D3
U17
U3
D6
U16
D2
D1
D5
R3
Resistance
10kΩ
U4
R2
Resistance
36kΩ
F1
R1
Resistance
36kΩ
U2
D4

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    FJ Cruiser Dashboard Module thumbnail
    USB-C Powered 3-Axis Digital Compass Module with MAX7219 7-Segment Display (Compass-Only, Automotive Use)

    Properties

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    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $38.29–$43.84

    Digi-Key

    $107.19–$111.00

    LCSC

    $58.85–$87.11

    Mouser

    $99.26–$99.32

    TME

    $35.81

    Verical

    $5.32–$10.31

    Controls