# Dashboard Digital Compass ## Description USB-C powered dashboard-mounted digital compass with three retro-orange 7-segment displays, magnetic compass sensing, and a brightness/off knob for an FJ cab installation. ## Project Details - **Owner:** brooks-bigchat1 - **Created:** 7/6/2026 - **Last Updated:** 7/6/2026 - **Visibility:** Public ## Key Components ### DISP1 — [LTS-5503AE](https://www.flux.ai/adrian95/lts-5503ae~4gb.md) - Manufacturer Part Number: LTS-5503AE - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/526/LTS-5x01_3A_LTD5x21_23A_LTC-56_753x-01.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Role: Display - Manufacturer Name: Lite-On Inc. - Role Details: Left digit; orient upright for vertical board facing cab **Pins:** - ANODE_A [pin 7] - ANODE_B [pin 6] - ANODE_C [pin 4] - ANODE_D [pin 2] - ANODE_D.P. [pin 5] - ANODE_E [pin 1] - ANODE_F [pin 9] - ANODE_G [pin 10] - COMMON_CATHODE_1 [pin 3] - COMMON_CATHODE_2 [pin 8] ### DISP2 — [LTS-5503AE](https://www.flux.ai/adrian95/lts-5503ae~4gb.md) - Role Details: Center digit; orient upright for vertical board facing cab - Role: Display - Manufacturer Name: Lite-On Inc. - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/526/LTS-5x01_3A_LTD5x21_23A_LTC-56_753x-01.pdf - Manufacturer Part Number: LTS-5503AE **Pins:** - ANODE_A [pin 7] - ANODE_B [pin 6] - ANODE_C [pin 4] - ANODE_D [pin 2] - ANODE_D.P. [pin 5] - ANODE_E [pin 1] - ANODE_F [pin 9] - ANODE_G [pin 10] - COMMON_CATHODE_1 [pin 3] - COMMON_CATHODE_2 [pin 8] ### DISP3 — [LTS-5503AE](https://www.flux.ai/adrian95/lts-5503ae~4gb.md) - Role Details: Right digit; orient upright for vertical board facing cab - Manufacturer Part Number: LTS-5503AE - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/526/LTS-5x01_3A_LTD5x21_23A_LTC-56_753x-01.pdf - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ - Role: Display - Manufacturer Name: Lite-On Inc. **Pins:** - ANODE_A [pin 7] - ANODE_B [pin 6] - ANODE_C [pin 4] - ANODE_D [pin 2] - ANODE_D.P. [pin 5] - ANODE_E [pin 1] - ANODE_F [pin 9] - ANODE_G [pin 10] - COMMON_CATHODE_1 [pin 3] - COMMON_CATHODE_2 [pin 8] ### J1 — [Type-C-2.0-6Pin](https://www.flux.ai/lcsc/type-c-2p0-6pin~3phf.md) - Package or Case Code: TYPE-C-SMD_TYPE-C-6P-2 - Manufacturer Name: Global Connector Technology - Datasheet URL: https://www.snapeda.com/parts/USB4515-GF-A/Global%20Connector%20Technology/datasheet/ - JLCPCB Part Class: Extended Part - LCSC Part Number: C7374563 - Role: Power Input - Role Details: USB-C sink-only 5V input; CC1/CC2 each need 5.1kΩ Rd - Symbol Style: parametric-v1 - Manufacturer Part Number: USB4515-GF-A - Part Type: USB Connectors **Pins:** - CC1 [pin A5] - CC2 [pin B5] - EH [pin 7] - GND [pin B12] - GND [pin A12] - VBUS [pin A9] - VBUS [pin B9] ### RV1 — [PDB181-K420K-103B](https://www.flux.ai/jecstronic/pdb181-k420k-103b~evz.md) - Role: User Input - Manufacturer Part Number: PDB181-K420K-103B - Role Details: Brightness potentiometer; firmware maps lowest setting to display off - Part Type: Potentiometer - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.bourns.com/docs/Product-Datasheets/PDB18.pdf - Manufacturer Name: Bourns Inc. **Pins:** - CCW [pin 1] - CW [pin 3] - WIPER [pin 2] ### U2 — [QMC5883L](https://www.flux.ai/lcsc/qmc5883l~fn19.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/C976032.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1RZUVJRQ1VcVTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Symbol Style: parametric-v1 - Manufacturer Name: QST(上海矽睿) - Package or Case Code: LGA-16_L3.0-W3.0-P0.50-BL_SQ - JLCPCB Part Class: Extended Part - Role Details: I2C magnetic compass sensor; place away from display currents and ferrous hardware - Part Type: Magnetic Sensors - Role: Sensor - Manufacturer Part Number: QMC5883L - LCSC Part Number: C976032 **Pins:** - C1 [pin 10] - DRDY [pin 15] - GND [pin 11] - GND [pin 9] - NC [pin 5] - NC [pin 6] - NC [pin 7] - NC [pin 3] - NC [pin 14] - S1 [pin 4] - SCL [pin 1] - SDA [pin 16] - SETC [pin 12] - SETP [pin 8] - VDD [pin 2] - VDDIO [pin 13] ### U3 — [MAX7219CWG+T](https://www.flux.ai/adrian95/max7219cwgplust~0pm.md) - Datasheet URL: http://componentsearchengine.com/Datasheets/1/MAX7219CWG+T.pdf - Manufacturer Part Number: MAX7219CWG+T - Role Details: Drives 3 common-cathode orange 7-segment displays from 5V - Role: Display Driver - Manufacturer Name: Analog Devices Inc./Maxim Integrated - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit **Pins:** - CLK [pin 13] - DIG0 [pin 2] - DIG1 [pin 11] - DIG2 [pin 6] - DIG3 [pin 7] - DIG4 [pin 3] - DIG5 [pin 10] - DIG6 [pin 5] - DIG7 [pin 8] - DIN [pin 1] - DOUT [pin 24] - GND_1 [pin 4] - GND_2 [pin 9] - ISET [pin 18] - LOAD [pin 12] - SEG_A [pin 14] - SEG_B [pin 16] - SEG_C [pin 20] - SEG_D [pin 23] - SEG_DP [pin 22] - SEG_E [pin 21] - SEG_F [pin 15] - SEG_G [pin 17] - V+ [pin 19] ### U4 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1~zlq.md) - Role Details: 3.3V rail from USB 5V; sized for about 260mA peak logic load - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Regulator - Part Type: Integrated Circuit - Manufacturer Name: Diodes Incorporated - Manufacturer Part Number: AP2112K-3.3TRG1 - Symbol Style: parametric-v1 **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### U5 — [SN74LVC1T45DRLR](https://www.flux.ai/jecstronic/sn74lvc1t45drlr~hkl.md) - Role: Level Shifter - Role Details: 3.3V to 5V display SPI DIN - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments - Manufacturer Part Number: SN74LVC1T45DRLR - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fsn74lvc1t45 - Part Type: Logic - Translator **Pins:** - A [pin 3] - B [pin 4] - DIR [pin 5] - GND [pin 2] - VCCA [pin 1] - VCCB [pin 6] ### U6 — [SN74LVC1T45DRLR](https://www.flux.ai/jecstronic/sn74lvc1t45drlr~hkl.md) - Manufacturer Part Number: SN74LVC1T45DRLR - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fsn74lvc1t45 - Role Details: 3.3V to 5V display SPI CLK - Part Type: Logic - Translator - Role: Level Shifter - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments **Pins:** - A [pin 3] - B [pin 4] - DIR [pin 5] - GND [pin 2] - VCCA [pin 1] - VCCB [pin 6] ### U7 — [SN74LVC1T45DRLR](https://www.flux.ai/jecstronic/sn74lvc1t45drlr~hkl.md) - Manufacturer Part Number: SN74LVC1T45DRLR - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fsn74lvc1t45 - Part Type: Logic - Translator - Role Details: 3.3V to 5V display SPI LOAD/CS - Role: Level Shifter - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments **Pins:** - A [pin 3] - B [pin 4] - DIR [pin 5] - GND [pin 2] - VCCA [pin 1] - VCCB [pin 6] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/brooks-bigchat1/dashboard-digital-compass~6s](https://www.flux.ai/brooks-bigchat1/dashboard-digital-compass~6s).* --- *Generated from [https://www.flux.ai/brooks-bigchat1/dashboard-digital-compass~6s](https://www.flux.ai/brooks-bigchat1/dashboard-digital-compass~6s)*