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
U6
U8
U7
U4 GNDIO - U5 GND
U6 ANODE_DP - U7 ANODE_DP
U6 ANODE_DP - U7 ANODE_DP
U12 ANODE_A - U13 ANODE_A
U6 ANODE_E - U7 ANODE_E
SW1 SW_2 - U2 PB4
U9 ANODE_D - U10 ANODE_D
U9 ANODE_C - U10 ANODE_C
SW1 SW_2 - U2 PB4
U6 ANODE_F - U7 ANODE_F
U2 PB6 - U4 SCX
U9 ANODE_C - U10 ANODE_C
U6 ANODE_C - U7 ANODE_C
U6 ANODE_B - U7 ANODE_B
D3 VBUS - D4 Cathode
U9 ANODE_G - U10 ANODE_G
U9 ANODE_B - U10 ANODE_B
SW1 R1_2 - U2 PA6
U6 ANODE_E - U7 ANODE_E
U6 ANODE_G - U7 ANODE_G
U9 ANODE_B - U10 ANODE_B
U9 ANODE_C - U10 ANODE_C
U6 ANODE_B - U7 ANODE_B
U6 ANODE_A - U7 ANODE_A
SW1 SW_2 - U2 PB4
U6 ANODE_G - U7 ANODE_G
U9 ANODE_A - U10 ANODE_A
U9 ANODE_E - U10 ANODE_E
SW1 SW_2 - U2 PB4
U9 ANODE_A - U10 ANODE_A
U9 ANODE_G - U10 ANODE_G
U6 ANODE_C - U7 ANODE_C
U9 ANODE_E - U10 ANODE_E
U2 VSS - U4 GND
SW1 SW_2 - U2 PB4
D2 A2 - D5 A2
U6 ANODE_G - U7 ANODE_G
U12 ANODE_E - U13 ANODE_E
U12 ANODE_F - U13 ANODE_F
U6 ANODE_D - U7 ANODE_D
U9 ANODE_DP - U10 ANODE_DP
U6 ANODE_A - U7 ANODE_A
U6 ANODE_F - U7 ANODE_F
U9 ANODE_D - U10 ANODE_D
SW1 R1_2 - U2 PA6
U9 ANODE_DP - U10 ANODE_DP
U2 PB7 - U4 SDX
U6 ANODE_A - U7 ANODE_A
U6 ANODE_E - U7 ANODE_E
U9 ANODE_F - U10 ANODE_F
U6 ANODE_C - U7 ANODE_C
U9 ANODE_G - U10 ANODE_G
U6 ANODE_D - U7 ANODE_D
U6 ANODE_DP - U7 ANODE_DP
U9 ANODE_B - U10 ANODE_B
U6 ANODE_D - U7 ANODE_D
U9 ANODE_F - U10 ANODE_F
D3 VBUS - D4 Cathode
SW1 SW_2 - U2 PB4
U6 ANODE_B - U7 ANODE_B
U9 ANODE_F - U10 ANODE_F
U9 ANODE_E - U10 ANODE_E
U9 ANODE_D - U10 ANODE_D
U9 ANODE_DP - U10 ANODE_DP
J1 ~ - U2 PB3
U9 ANODE_A - U10 ANODE_A
C5 P2 - U15 GND
U12 ANODE_B - U13 ANODE_B
D2 A2 - D5 A2
U6 ANODE_F - U7 ANODE_F
J1 ~ - U2 PB3
SW1 SW_2 - U2 PB4
J1
GND
Hole7
Hole8
U3
D6
R3
Resistance
10kΩ
R2
Resistance
36kΩ
D2
R1
Resistance
36kΩ
D1
U2
D5
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

V

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