# Competitive Violet Sonic Screwdriver ## Description Marine Engine Start Panel Control Board with ESP32-WROOM-32D, 12 V Relay Outputs, PCA9685 LED Drivers, and MOSFET-Based Screen PWM Control ## Project Details - **Owner:** sailracingacademy - **Created:** 12/1/2025 - **Last Updated:** 12/3/2025 - **Visibility:** Public - **Screen Control GPIO:** IO15 - **RoutingChannelZone:** 3–4 mm above bottom edge - **PCB Size X (mm):** 120mm - **Human Interface:** Display - **Manufacturing Quantity Target:** 25 - **License:** http://solderpad.org/licenses/SHL-2.1/ - **Part Type:** Microcontroller - **Software:** Arduino - **Relay Coil Voltage:** 12V - **Domain:** Marine - **Operating Voltage:** 12V - **PCB Size Y (mm):** 80mm - **Manufacturer Name:** Espressif - **RoutingChannelNoTallParts:** true - **System Architecture:** flowchart LR VIN[12–15 V Battery Input] TVS[TVS Surge Protection] RPD[Reverse Polarity Protection Diode] EMI[EMI Filter & Chokes] BUCK1[MP1584 Buck to 5 V] BUCK2[MP1584 Buck to 3.3 V] ESP[ESP32-WROOM-32D] REF[2.5 V REF3025] OPAMP[MCP6002 Tachometer Op Amp] PCA[PCA9685 16ch PWM LED Driver] ULN[ULN2803 8ch Darlington Relay/Loads] TXB[TXB0108 Level Shifter] ST_RX[6N137 SeaTalk RX Opto] ST_TX[6N137 SeaTalk TX Opto] VIN --> TVS --> RPD --> EMI --> BUCK1 -->|5 V Rail| PCA EMI --> BUCK2 -->|3.3 V Rail| ESP BUCK2 --> REF ESP <--> TXB <--> External_Sensors[5 V Digital Sensors] ESP <--> PCA --> LED_OUTS[12 V PWM LED Outputs (via external FETs/FET headers)] ESP --> ULN --> RELAYS[Start/Stop/Alt/Fan Relay Coils] ESP --> ULN --> ALT_OUT[Alternator Field / Lamp Output] ESP --> SCREEN_CTRL[Screen On/Dim Control] ESP <--> UART_HDR[UART Header to Raspberry Pi + Debug] ESP <--> ST_IF[SeaTalk 1 Bus] ST_IF --> ST_RX & ST_TX SENSORS[Oil P, Temp, Battery V, Fuel, Water, Tach, Light] --> COND[RC Filters, Dividers, Protection] --> ESP BTN[4x Push Buttons] --> DEBOUNCE[RC Debounce + Pulls] --> ESP - **Connectivity:** WiFi - **PlacementZoneGuidance:** power/relays bottom-left; LEDs bottom-right; logic top - **ESP32 Variant:** ESP32-WROOM-32D - **RoutingChannel:** 4 mm above bottom connector row - **ERC/DRC Review Status:** Latest ERC/DRC results fetched via review tool; see Reviews panel for current issues - **Reliability Target (MTBF):** 30000hours - **RoutingChannelHeight:** 4mm - **DRCFixesPending:** route airwires; fill copper zones; assign missing footprints; correct layout rule violations - **Relay Coil Current:** 0.1A - **ConnectorEdge:** bottom - **Connector Pitch:** 2.54mm - **Power Requirements:** Battery - **LED Drive Current:** 0.02A ## Key Components ### D1 — [SMBJ15A-TP](https://www.flux.ai/lcsc/smbj15a-tp~0o1n.md) - Manufacturer Part Number: SMBJ15A-TP - LCSC Part Number: C669039 - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302201_MCC-Micro-Commercial-Components-SMBJ15A-TP_C669039.pdf - Product Info Url: https://lcsc.com/product-detail/TVS_MCC-Micro-Commercial-Components-MCC-SMBJ15A-TP_C669039.html - Role Details: Surge and ESD protection on 12–15V input - Part Type: TVS - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Role: Protection - Manufacturer Name: MCC(美微科) **Pins:** - A [pin 2] - C [pin 1] ### D2 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Manufacturer Part Number: SS14 - Part Type: Diode - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Protection - Role Details: Reverse-polarity protection on 12–15V input - Manufacturer Name: Slkor(SLKORMICRO Elec.) **Pins:** - Anode [pin A] - Cathode [pin C] ### D5 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Current Rating: 1A - Manufacturer Name: Slkor(SLKORMICRO Elec.) - Role Details: Flyback diode for RELAY5 coil - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf - Role: Flyback / Freewheeling - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SS14 - Part Type: Diode **Pins:** - Anode [pin A] - Cathode [pin C] ### J1 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - PlacementZone: bottom - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - PlacementOrder: 1 - Role: Connector - PlacementEdge: Bottom-Row - Role Details: External power input terminal block, 5.08 mm pitch, 2-pin - Manufacturer Name: TE Connectivity AMP Connectors - Part Type: Connector - Manufacturer Part Number: 282837-2 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J10 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Role Details: Switch input terminal block, 5.08 mm pitch, 2-pin - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - PlacementZone: bottom - PlacementOrder: 10 - Role: Connector - Manufacturer Name: TE Connectivity AMP Connectors - PlacementEdge: Bottom-Row - Part Type: Connector - Manufacturer Part Number: 282837-2 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J11 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - PlacementZone: bottom - PlacementEdge: Bottom-Row - Role: Connector - PlacementOrder: 11 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Role Details: Switch input terminal block, 5.08 mm pitch, 2-pin - Manufacturer Part Number: 282837-2 - Part Type: Connector - Manufacturer Name: TE Connectivity AMP Connectors **Pins:** - 1 [pin 1] - 2 [pin 2] ### J12 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Role Details: Switch input terminal block, 5.08 mm pitch, 2-pin - PlacementOrder: 12 - PlacementZone: bottom - Role: Connector - PlacementEdge: Bottom-Row - Part Type: Connector - Manufacturer Part Number: 282837-2 - Manufacturer Name: TE Connectivity AMP Connectors **Pins:** - 1 [pin 1] - 2 [pin 2] ### J13 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - PlacementZone: bottom - Manufacturer Name: TE Connectivity AMP Connectors - Part Type: Connector - Manufacturer Part Number: 282837-2 - PlacementEdge: Bottom-Row - PlacementOrder: 13 - Role: Connector - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Role Details: Switch input terminal block, 5.08 mm pitch, 2-pin **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [Connector 01x08 0.100](https://www.flux.ai/vasy_skral/connector-01x08-0100~q3l.md) - Role: Connector - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Sensor I/O header, 2.54 mm pitch, 1×8 through-hole - PlacementZone: bottom - PlacementEdge: Bottom-Row - PlacementOrder: 2 **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] ### J3 — [282837-4](https://www.flux.ai/adrian95/282837-4~o7p.md) - Datasheet URL: https://www.te.com/usa-en/product-282837-4.datasheet.pdf - PlacementEdge: Bottom-Row - PlacementZone: bottom - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Push-button inputs terminal block, 5.08 mm pitch, 4-pin - Part Type: Connector - Manufacturer Name: TE Connectivity AMP Connectors - Manufacturer Part Number: 282837-4 - PlacementOrder: 3 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J4 — [2x5 Pin Shrouded Header](https://www.flux.ai/rex-flux/2x5-pin-shrouded-header~tg.md) - Manufacturer Part Number: 61201021621 - Role: Connector - Part Type: Connector - Datasheet URL: https://www.we-online.com/catalog/datasheet/61201021621.pdf - PlacementOrder: 4 - PlacementEdge: Bottom-Row - PlacementZone: bottom - Role Details: UART header, shrouded, 2×5, 2.54 mm pitch - Manufacturer Name: Würth Elektronik **Pins:** - P1 [pin 1] - P10 [pin 10] - P2 [pin 2] - P3 [pin 3] - P4 [pin 4] - P5 [pin 5] - P6 [pin 6] - P7 [pin 8] - P7 [pin 7] - P9 [pin 9] ### J5 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Role: Connector - Role Details: SeaTalk 1 interface terminal block, 5.08 mm pitch, 2-pin - PlacementOrder: 5 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Manufacturer Name: TE Connectivity AMP Connectors - Manufacturer Part Number: 282837-2 - PlacementZone: bottom - PlacementEdge: Bottom-Row - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] ### J6 — [282837-4](https://www.flux.ai/adrian95/282837-4~o7p.md) - PlacementZone: bottom - Role Details: LED PWM outputs terminal block, 5.08 mm pitch, 4-pin - Datasheet URL: https://www.te.com/usa-en/product-282837-4.datasheet.pdf - License: https://creativecommons.org/licenses/by/4.0/ - PlacementOrder: 6 - Part Type: Connector - Manufacturer Part Number: 282837-4 - Manufacturer Name: TE Connectivity AMP Connectors - Role: Connector - PlacementEdge: Bottom-Row **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J7 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - PlacementOrder: 7 - PlacementZone: bottom - PlacementEdge: Bottom-Row - Role Details: Alternator output terminal block, 5.08 mm pitch, 2-pin - Role: Connector - Manufacturer Name: TE Connectivity AMP Connectors - Part Type: Connector - Manufacturer Part Number: 282837-2 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J8 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - PlacementZone: bottom - Part Type: Connector - Role: Connector - PlacementOrder: 8 - PlacementEdge: Bottom-Row - Role Details: Screen-control connector, 2-pin, 2.54 mm pitch - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### J9 — [282837-4](https://www.flux.ai/adrian95/282837-4~o7p.md) - Role: Connector - Datasheet URL: https://www.te.com/usa-en/product-282837-4.datasheet.pdf - License: https://creativecommons.org/licenses/by/4.0/ - PlacementEdge: Bottom-Row - Role Details: Relay outputs terminal block, 5.08 mm pitch, 4-pin - PlacementOrder: 9 - PlacementZone: bottom - Manufacturer Name: TE Connectivity AMP Connectors - Part Type: Connector - Manufacturer Part Number: 282837-4 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### P1 — [PAD WITH HOLE 4mmx1.5mm](https://www.flux.ai/adrian95/pad-with-hole-4mmx15mm~wdx.md) - Role: Cable signal connection - Role Details: Solder-tail pad for pre-existing cable signal **Pins:** - P1 ### P2 — [PAD WITH HOLE 4mmx1.5mm](https://www.flux.ai/adrian95/pad-with-hole-4mmx15mm~wdx.md) - Role Details: Solder-tail pad for pre-existing cable signal - Role: Cable signal connection **Pins:** - P1 ### Q1 — [FDG1024NZ](https://www.flux.ai/kicad-part-library/fdg1024nz~5ei.md) - Package or Case Code: SOT-363_SC-70-6 - Role Details: Display control driver for screen PWM output - Datasheet URL: https://www.onsemi.com/pub/Collateral/FDG1024NZ-D.pdf - Manufacturer Part Number: FDG1024NZ - Role: Driver **Pins:** - D [pin 6] - D [pin 3] - G [pin 2] - G [pin 5] - S [pin 4] - S [pin 1] ### RELAY5 — [Relay-12VDC-SL-C](https://www.flux.ai/deadzerok/relay-12vdc-sl-c~zh.md) - Current Rating: 15A - Datasheet URL: https://datasheet.lcsc.com/lcsc/2304140030_Ningbo-Songle-Relay-SRD-12VDC-SL-C_C30431.pdf - Manufacturer Part Number: SRD-12VDC-SL-C - Role: Relay - Part Type: Relay - Manufacturer Name: Ningbo Songle Relay - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Fifth relay channel, 10–15 A SPST-NO - PlacementZone: bottom-left **Pins:** - Coil-1 [pin COIL1] - Coil-2 [pin COIL2] - Com-3 [pin COM] - NC [pin NC] - NO [pin NO] ### U1 — [ESP32-WROOM-32D](https://www.flux.ai/vasyl/esp32-wroom-32d~7py.md) - PlacementZone: top - Manufacturer Name: Espressif Systems - Part Type: Microcontroller - Manufacturer Part Number: ESP32-WROOM-32D - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Main MCU **Pins:** - 3.3V [pin 2] - AGND [pin 39] - CLK [pin 20] - CMD [pin 19] - EN [pin 3] - GND [pin 38] - GND [pin 15] - GND [pin 1] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 32] - RXD0 [pin 34] - SD0 [pin 21] - SD1 [pin 22] - SD2 [pin 17] - SD3 [pin 18] - TXD0 [pin 35] - VN [pin 5] - VP [pin 4] ### U1 — [MP1584EN-LF-P](https://www.flux.ai/monolithicpower/mp1584en-lf-p~ewo.md) - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/M/P/MP1584_109_1_3.jpg - Role: Power Conversion - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/109?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Role Details: Buck converter for 5V and 3.3V rails - Manufacturer Part Number: MP1584EN-LF-P - Package or Case Code: SOIC8E_MPS_MNP - Manufacturer Name: Monolithic Power Systems - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP1584EN-LF-Z **Pins:** - BST [pin 8] - COMP [pin 3] - EN [pin 2] - EPAD [pin EPAD] - FB [pin 4] - FREQ [pin 6] - GND [pin 5] - SW [pin 1] - VIN [pin 7] ### U2 — [MCP6002-EP](https://www.flux.ai/jecstronic/mcp6002-ep~ki.md) - Manufacturer Name: Microchip - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP6001-1R-1U-2-4-1-MHz-Low-Power-Op-Amp-DS20001733L.pdf - Manufacturer Part Number: MCP6002-E/P - Role Details: Tachometer input conditioning - Role: Amplification - PlacementZone: bottom-left - Part Type: Operational Amplifier (OP-AMP) **Pins:** - - [pin 2] - - [pin 6] - + [pin 5] - + [pin 3] - ~ [pin 1] - OUTPUT [pin 7] - V- [pin 4] - V+ [pin 8] ### U2 — [MP1584EN-LF-P](https://www.flux.ai/monolithicpower/mp1584en-lf-p~ewo.md) - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/109?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/M/P/MP1584_109_1_3.jpg - Role Details: Buck converter for 5V and 3.3V rails - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP1584EN-LF-Z - Manufacturer Name: Monolithic Power Systems - Package or Case Code: SOIC8E_MPS_MNP - Manufacturer Part Number: MP1584EN-LF-P - Role: Power Conversion **Pins:** - BST [pin 8] - COMP [pin 3] - EN [pin 2] - EPAD [pin EPAD] - FB [pin 4] - FREQ [pin 6] - GND [pin 5] - SW [pin 1] - VIN [pin 7] ### U3 — [PCA9685PW,118](https://www.flux.ai/lcsc/pca9685pwc118~77ym.md) - Package or Case Code: TSSOP-28_L9.7-W4.4-P0.65-LS6.4-TL - Manufacturer Part Number: PCA9685PW,118 - Role: LED Driving - Manufacturer Name: NXP(恩智浦) - LCSC Part Number: C2678753 - Role Details: 16-channel PWM LED driver - Part Type: LED Drivers - JLCPCB Part Class: Extended Part - PlacementZone: top **Pins:** - ~{OE} [pin 23] - A0 [pin 1] - A1 [pin 2] - A2 [pin 3] - A3 [pin 4] - A4 [pin 5] - A5 [pin 24] - EXTCLK [pin 25] - LED0 [pin 6] - LED1 [pin 7] - LED10 [pin 17] - LED11 [pin 18] - LED12 [pin 19] - LED13 [pin 20] - LED14 [pin 21] - LED15 [pin 22] - LED2 [pin 8] - LED3 [pin 9] - LED4 [pin 10] - LED5 [pin 11] - LED6 [pin 12] - LED7 [pin 13] - LED8 [pin 15] - LED9 [pin 16] - SCL [pin 26] - SDA [pin 27] - VDD [pin 28] - VSS [pin 14] ### U3 — [6N137-560E](https://www.flux.ai/lcsc/6n137-560e~5zav.md) - Role Details: Optocoupler for SeaTalk 1 interface - Manufacturer Name: Broadcom/AVAGO(安华高) - Part Type: Optocouplers - Logic Output - JLCPCB Part Class: Extended Part - Manufacturer Part Number: 6N137-560E - Package or Case Code: DIP-8_L9.7-W6.4-P2.54-LS7.6-BL - LCSC Part Number: C691908 - Role: Isolation **Pins:** - ANODE [pin 2] - CATHODE [pin 3] - GND [pin 5] - NC [pin 1] - NC [pin 4] - VCC [pin 8] - VE [pin 7] - VO [pin 6] ### U4 — [6N137-560E](https://www.flux.ai/lcsc/6n137-560e~5zav.md) - Package or Case Code: DIP-8_L9.7-W6.4-P2.54-LS7.6-BL - Role Details: Optocoupler for SeaTalk 1 interface - LCSC Part Number: C691908 - Part Type: Optocouplers - Logic Output - Role: Isolation - Manufacturer Name: Broadcom/AVAGO(安华高) - JLCPCB Part Class: Extended Part - Manufacturer Part Number: 6N137-560E **Pins:** - ANODE [pin 2] - CATHODE [pin 3] - GND [pin 5] - NC [pin 1] - NC [pin 4] - VCC [pin 8] - VE [pin 7] - VO [pin 6] ### U4 — [ULN2803A](https://www.flux.ai/lcsc/uln2803a~i9jk.md) - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Darlington-transistor-array-driver_UMW-Youtai-Semiconductor-Co-Ltd-ULN2803A_C845537.html - Role Details: 8-channel Darlington array for relay drivers - Role: Relay Driving - Package or Case Code: SOP-18_L11.4-W7.6-P1.27-LS10.6-BL - Manufacturer Part Number: ULN2803A - LCSC Part Number: C845537 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410251531_UMW-Youtai-Semiconductor-Co---Ltd--ULN2803A_C845537.pdf - Part Type: Darlington transistor array driver - Manufacturer Name: UMW(友台半导体) **Pins:** - COM [pin 10] - GND [pin 9] - Input [pin 5] - Input [pin 1] - Input [pin 6] - Input [pin 4] - Input [pin 8] - Input [pin 3] - Input [pin 2] - Input [pin 7] - Output [pin 16] - Output [pin 15] - Output [pin 13] - Output [pin 12] - Output [pin 18] - Output [pin 17] - Output [pin 11] - Output [pin 14] ### U5 — [TXB0108PWR](https://www.flux.ai/jecstronic/txb0108pwr~t84.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: TXB0108PWR - Datasheet URL: https://www.ti.com/lit/ds/symlink/txb0108.pdf? - Part Type: Integrated Circuit - Role Details: Level shifting for digital sensor I/O between 3.3V MCU and up to 5V sensor signals - Role: Logic-level Shifting - Manufacturer Name: Texas Instruments - PlacementZone: top **Pins:** - A1 [pin 1] - A2 [pin 3] - A3 [pin 4] - A4 [pin 5] - A5 [pin 6] - A6 [pin 7] - A7 [pin 8] - A8 [pin 9] - B1 [pin 20] - B2 [pin 18] - B3 [pin 17] - B4 [pin 16] - B5 [pin 15] - B6 [pin 14] - B7 [pin 13] - B8 [pin 12] - GND [pin 11] - OE [pin 10] - VCCA [pin 2] - VCCB [pin 19] ### U6 — [REF3025AIDBZT](https://www.flux.ai/vasyl/ref3025aidbzt~3ri.md) - Manufacturer Part Number: REF3025AIDBZT - Manufacturer Name: Texas Instruments - Role: Voltage Reference - Datasheet URL: https://www.ti.com/lit/gpn/ref3030 - Role Details: 2.5V precision voltage reference for analog conditioning (ADC and comparator) - Part Type: Integrated Circuit **Pins:** - GND [pin 3] - IN [pin 1] - OUT [pin 2] ### Y1 — [ABS05-32.768KHZ-9-T](https://www.flux.ai/adrian95/abs05-32p768khz-9-t~opp.md) - Part Type: Oscillator - Manufacturer Part Number: ABS05-32.768KHZ-9-T - Manufacturer Name: Abracon LLC - Role: Oscillator - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://abracon.com/Resonators/ABS05.pdf - Role Details: 32.768 kHz RTC crystal for ESP32 low-frequency clock **Pins:** - 1 [pin 1] - 2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/sailracingacademy/competitive-violet-sonic-screwdriver~9c](https://www.flux.ai/sailracingacademy/competitive-violet-sonic-screwdriver~9c).* --- *Generated from [https://www.flux.ai/sailracingacademy/competitive-violet-sonic-screwdriver~9c](https://www.flux.ai/sailracingacademy/competitive-violet-sonic-screwdriver~9c)*