# Solar Dashboard Compass ## Description Solar-powered dashboard compass for an FJ Cruiser with rechargeable battery backup, retro orange three-digit 7-segment direction display, and rotary brightness/off control. ## Project Details - **Owner:** brooks - **Created:** 5/29/2026 - **Last Updated:** 5/29/2026 - **Visibility:** Public - **Copies:** 1 ## Key Components ### D1 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Manufacturer Part Number: SS14 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Role: Rectification - Role Details: Boost converter rectifier diode, 40V 1A Schottky - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf - Manufacturer Name: Slkor(SLKORMICRO Elec.) **Pins:** - Anode [pin A] - Cathode [pin C] ### DS1 — [LTS-5503AE](https://www.flux.ai/adrian95/lts-5503ae~4gb.md) - Manufacturer Name: Lite-On Inc. - Role Details: Left 7-segment digit for retro orange compass display - 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 - Role: Display - License: https://creativecommons.org/licenses/by/4.0/ - 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] ### DS2 — [LTS-5503AE](https://www.flux.ai/adrian95/lts-5503ae~4gb.md) - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/526/LTS-5x01_3A_LTD5x21_23A_LTC-56_753x-01.pdf - Manufacturer Name: Lite-On Inc. - Role Details: Middle 7-segment digit for retro orange compass display - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LTS-5503AE - Role: Display - Part Type: LED **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] ### DS3 — [LTS-5503AE](https://www.flux.ai/adrian95/lts-5503ae~4gb.md) - Part Type: LED - Manufacturer Part Number: LTS-5503AE - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Lite-On Inc. - Role: Display - Role Details: Right 7-segment digit for retro orange compass display - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/526/LTS-5x01_3A_LTD5x21_23A_LTC-56_753x-01.pdf **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 — [B2B-PH-K-S](https://www.flux.ai/adrian95/b2b-ph-k-s~fx.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: 2-pin JST-PH battery connector for one LiPo cell - Role: Battery Connector - Manufacturer Name: JST - Package or Case Code: JST_B2B-PH-K-S - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Manufacturer Part Number: B2B-PH-K-S - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [XY301V-A-5.0-2P](https://www.flux.ai/jharwinbarrozo/xy301v-a-50-2p~u6.md) - Manufacturer Name: Ningbo Xinlaiya Elec. - Role Details: 2-pin screw terminal for small 5V to 6V dashboard solar panel - Part Type: Connector - Datasheet URL: https://www.lcsc.com/datasheet/C557651.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=E1BYV1AHFgUMXgFVQ1AMU1JVQFReXgIATwJfA10DFVkxVlNRT1dXXlVTQ1hbUjsOAxUeFF5JWBYZEEoBGA4JCwFIFA4DSA%3D%3D - Manufacturer Part Number: XY301V-A-5.0-2P - Role: Solar Input Connector **Pins:** - PIN1 [pin 1] - PIN2 [pin 2] ### J3 — [ARM JTAG SWD 10Pin 0.05" Connector](https://www.flux.ai/vasy_skral/arm-jtag-swd-10pin-005-connector~y0b.md) - Datasheet URL: https://suddendocs.samtec.com/catalog_english/ftsh_smt.pdf - Manufacturer Name: Analog Devices - Part Type: Connector - Symbol Style: parametric-v1 - Role: Programming Connector - Manufacturer Part Number: FTSH-105-01-L-DV-007-K - Role Details: ARM Cortex SWD connector for flashing and debugging STM32 firmware **Pins:** - ~RESET~ [pin 10] - GND [pin 5] - GND [pin 3] - GNDDetect [pin 9] - NC/TDI [pin 8] - SWDCLK/TCK [pin 4] - SWDIO/TMS [pin 2] - SWO/TDO [pin 6] - VTref [pin 1] ### RV1 — [PTR902-2015K-A104](https://www.flux.ai/jecstronic/ptr902-2015k-a104~709.md) - Manufacturer Part Number: PTR902-2015K-A104 - Role Details: Integrated switched rotary control; using available 100k switched pot library part as knob input/off control - Manufacturer Name: Texas Instruments Inc. - Role: Brightness Control - Datasheet URL: https://www.bourns.com/docs/Product-Datasheets/PTR90.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Potentiometer **Pins:** - R1_1 [pin 1] - R1_2 [pin 2] - R1_3 [pin 3] - R2_1 [pin 4] - R2_2 [pin 5] - R2_3 [pin 6] - SW_1 [pin 7] - SW_2 [pin 8] ### U1 — [STM32L031G6U6S](https://www.flux.ai/vasyl/stm32l031g6u6s~zrh.md) - Manufacturer Part Number: STM32L031G6U6S - Part Type: Microcontroller - Symbol Style: parametric-v1 - Role: Microcontroller - Role Details: 3.3V low-power controller for compass sensing, display multiplexing, brightness ADC, and calibration - Datasheet URL: https://www.st.com/resource/en/datasheet/stm32l031c6.pdf - Manufacturer Name: STMicroelectronics **Pins:** - BOOT0 [pin 1] - NRST [pin 4] - P14 [pin 22] - PA0 [pin 6] - PA1 [pin 7] - PA10 [pin 20] - PA13 [pin 21] - PA14 [pin 23] - PA2 [pin 8] - PA3 [pin 9] - PA4 [pin 10] - PA5 [pin 11] - PA6 [pin 12] - PA7 [pin 13] - PA8 [pin 18] - PA9 [pin 19] - PB0 [pin 14] - PB1 [pin 15] - PB3 [pin 24] - PB4 [pin 25] - PB5 [pin 26] - PB6 [pin 27] - PB7 [pin 28] - PC14 [pin 2] - PC15 [pin 3] - VDD [pin 17] - VDDA [pin 5] - VSS [pin 16] ### U2 — [MMC5633NJL](https://www.flux.ai/kicad-part-library/mmc5633njl~y31.md) - Role Details: I2C 3-axis compass sensor, keep away from high-current display wiring and magnetic materials - Manufacturer Name: Texas Instruments Inc. - Role: Magnetometer - Package or Case Code: WLP-4_0.86x0.86mm_P0.4mm - Datasheet URL: http://www.memsic.com/uploadfiles/2020/08/20200827165106864.pdf - Manufacturer Part Number: MMC5633NJL **Pins:** - SCL [pin A2] - SDA [pin B2] - VDD [pin B1] - VSA [pin A1] ### U3 — [MCP73871](https://www.flux.ai/kicad-part-library/mcp73871~kg6.md) - Role: Battery Charger - Package or Case Code: QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm - Datasheet URL: http://www.mouser.com/ds/2/268/22090a-52174.pdf - Manufacturer Part Number: MCP73871 - Role Details: Solar/LiPo power-path charger sized for ~200mA system load estimate **Pins:** - ~{PG} [pin 6] - ~{TE} [pin 9] - CE [pin 17] - IN [pin 19] - IN [pin 18] - OUT [pin 20] - OUT [pin 1] - PROG1 [pin 13] - PROG2 [pin 4] - PROG3 [pin 12] - SEL [pin 3] - STAT1/~{LBO} [pin 8] - STAT2 [pin 7] - THERM [pin 5] - V_{BAT_SENSE} [pin 16] - V_{BAT} [pin 14] - V_{BAT} [pin 15] - V_{SS} [pin 21] - V_{SS} [pin 11] - V_{SS} [pin 10] - VPCC [pin 2] ### U4 — [MCP1703Ax-330xxTT](https://www.flux.ai/kicad-part-library/mcp1703ax-330xxtt~9wn.md) - Package or Case Code: SOT-23 - Role Details: 3.3V logic rail for MCU and magnetometer; display LEDs remain on switched system rail - Datasheet URL: http://ww1.microchip.com/downloads/en/DeviceDoc/20005122B.pdf - Manufacturer Part Number: MCP1703Ax-330xxTT - Manufacturer Name: Microchip Technology Inc. - Role: Linear Regulator **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] ### U5 — [MAX7219EWG+](https://www.flux.ai/jharwinbarrozo/max7219ewgplus~kjc.md) - Datasheet URL: https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf - Manufacturer Name: Maxim Integrated - Manufacturer Part Number: MAX7219EWG+ - Part Type: Integrated Circuit - Role Details: 5V common-cathode 7-segment driver; scan limit configured for 3 digits; RSET selected for ~10mA segment current to control heat and battery load - Role: Switching **Pins:** - 1 / DIN - 10 / DIG_5 - 11 / DIG_1 - 12 / LOAD - 13 / CLK - 14 / SEG_A - 15 / SEG_F - 16 / SEG_B - 17 / SEG_G - 18 / ISET - 19 / V+ - 2 / DIG_0 - 20 / SEG_C - 21 / SEG_E - 22 / SEG_DP - 23 / SEG_D - 24 / DOUT - 3 / DIG_4 - 4 / GND - 5 / DIG_6 - 6 / DIG_2 - 7 / DIG_3 - 8 / DIG_7 - 9 / GND__1 ### U6 — [TLV61047DDCR](https://www.flux.ai/adrian95/tlv61047ddcr~x9s.md) - License: https://creativecommons.org/licenses/by/4.0/ - Integrated Circuit Type: Power Management - Role Details: 5V boost converter; worst-case input current about 176mA for 90mA at 5V with 85% efficiency - Manufacturer Part Number: TLV61047DDCR - Role: Power Conversion - Package or Case Code: SOT95P280X110-5N - Part Type: Integrated Circuit - Datasheet URL: https://www.ti.com/lit/ds/symlink/tlv61047.pdf?ts=1744891624532&ref_url=https%253A%252F%252Fwww.ti.com%252Fcompare-products%252F%253Fid%253D360082%2526type%253DGPT%2526partList%253DTLV61047%252CTLV61048%252CTLV61046A%252CTPS61096A%2526columnList%253D-2%25 - Manufacturer Name: Texas Instruments **Pins:** - EN [pin 4] - FB [pin 3] - GND [pin 2] - SW [pin 1] - VIN [pin 5] ### U7 — [74AHCT125D-Q100,11](https://www.flux.ai/adrian95/74ahct125d-q100c11~l94.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Logic-level Shifting - Part Type: Integrated Circuit - Manufacturer Part Number: 74AHCT125D-Q100,11 - Datasheet URL: https://assets.nexperia.com/documents/data-sheet/74AHC_AHCT125_Q100.pdf - Manufacturer Name: Nexperia USA Inc. - Role Details: AHCT buffer powered from 5V accepts 3.3V MCU logic and drives MAX7219 DIN/CLK/LOAD **Pins:** - 1~OE [pin 1] - 1A [pin 2] - 1Y [pin 3] - 2~OE [pin 4] - 2A [pin 5] - 2Y [pin 6] - 3~OE [pin 10] - 3A [pin 9] - 3Y [pin 8] - 4~OE [pin 13] - 4A [pin 12] - 4Y [pin 11] - GND [pin 7] - VCC [pin 14] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/brooks/solar-dashboard-compass-7kaee~zr](https://www.flux.ai/brooks/solar-dashboard-compass-7kaee~zr).* --- *Generated from [https://www.flux.ai/brooks/solar-dashboard-compass-7kaee~zr](https://www.flux.ai/brooks/solar-dashboard-compass-7kaee~zr)*