# EcoCore Refboard ## Description EcoCore ESP32 Reference Board – Final Net Mapping, Protection Ratings, 4-Layer PCB Prep, and Integrated USB-C Programming Interface with USB-UART Bridge, CC Pull-Downs, Low-Capacitance ESD Protection, and Isolated USB 5V / 5V Actuator / 12V Rails (with Verified DRC/ERC Status and Pre-Production Layout Checklist) ## Project Details - **Owner:** terratronix - **Created:** 12/25/2025 - **Last Updated:** 12/25/2025 - **Visibility:** Public - **System Architecture:** ```mermaid flowchart TD MCU["ESP32 MCU Domain"] PWR["Power/Protection Domain"] REL["Relay Control Domain"] PWM["PWM I/O Headers"] DHT["DHT22 Connectors"] I2C["I2C Expansion Header"] DBG["Programming/Test Pad Domain"] LED["Status LED Domain"] USB["USB Interface Domain"] PWR --> MCU MCU --> REL MCU --> PWM MCU --> DHT MCU --> I2C MCU --> DBG MCU --> LED MCU --> USB ``` - **Trace Widths:** 12V = 3 mm, 5V = 1 mm, 3V3 = 0.8 mm - **Trace Width 5V:** 1mm - **USB-C Placement:** Near ESP32, away from relay/12V zone - **Net Class: Low Speed:** EN, IO0, PWM1, PWM2, CC1, CC2, DHT1_DATA, DHT2_DATA - **Zone A (Logic):** Contains U1, J8, U5, J6, J7, D7, R15, R16, USB test points TP_DP/TP_DN/TP_CC1/TP_CC2, TP_3V3, TP_5V, TP_GND, D4–D6, and associated passives - **Trace Width 3V3:** 0.8mm - **Board Dimensions:** 40.0 mm × 25.0 mm - **Net Class: Medium Speed:** TX0, RX0 - **Silkscreen Intent:** Clear outlines and labels for USB-C receptacle, CC, D+/D– test pads - **Mechanical Features:** Four non-plated 3.0 mm holes (TP_DP, TP_DN, TP_CC1, TP_CC2 groups) used as combined mounting and USB probe access - **Stackup:** Standard 4 Layer: Top (signal), Layer 2 (ground plane), Layer 3 (power pours), Bottom (signal) - **Mounting Approach:** USB-C and BOOT/RESET header near ESP32, keep clearance from relay/12V zone; use existing 3.0 mm non-plated holes (TP_DP/TP_DN/TP_CC1/TP_CC2) as mechanical and probe access features - **Mounting Holes:** Four non-plated 3.0 mm holes (TP_DP, TP_DN, TP_CC1, TP_CC2) used as mechanical mounting and USB probe access features - **Zone B (Power/Relays):** Contains F1, D1–D3, D8–D9, U2, U3, U4, J1–J3, J4–J5, TP_12V, bulk/decoupling capacitors C1–C4, and relay status LEDs and resistors - **Net Class: High Speed:** D+, D- - **Trace Width 12V:** 3mm - **Net Class: Ground:** GND ## Key Components ### D1 — [1N4001-TP](https://www.flux.ai/adrian95/1n4001-tp~3k.md) - Part Type: Diode - Manufacturer Name: Micro Commercial Co - Manufacturer Part Number: 1N4001-TP - Package: DO-41 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Protection - Role Details: Reverse polarity protection for 12V input - Datasheet URL: https://www.mccsemi.com/pdf/Products/1N4001~1N4007(DO-41).pdf **Pins:** - A [pin 2] - K [pin 1] ### D2 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Manufacturer Part Number: SS14 - Part Type: Diode - Role: Protection - Role Details: Schottky diode for input protection and reverse blocking - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Package: SMA - Manufacturer Name: Slkor(SLKORMICRO Elec.) **Pins:** - Anode [pin A] - Cathode [pin C] ### D3 — [SMBJ14A](https://www.flux.ai/lcsc/smbj14a~u7fo.md) - Package or Case Code: SMB_L4.5-W3.7-LS5.4-RD - Manufacturer Name: Liown(里阳半导体) - LCSC Part Number: C2989893 - Package: SMB_L4.5-W3.7-LS5.4-RD - Role Details: TVS diode for transient voltage suppression on 12V input - Role: Protection - Manufacturer Part Number: SMBJ14A - JLCPCB Part Class: Extended Part - Part Type: TVS **Pins:** - A [pin 2] - C [pin 1] ### D4 — [SMLP14ECNWT86](https://www.flux.ai/moshtey/smlp14ecnwt86~ov.md) - Mount: Surface Mount - Package: LEDM1608X80 - Manufacturer Part Number: SMLP14ECNWT86 - Package or Case Code: D_0603_1608Metric - Part Type: LED - Role Details: Rail indicator for 12V rail - Diode Type: LED - Role: LED **Pins:** - 1 [pin 1] - 2 [pin 2] ### D5 — [SMLP14ECNWT86](https://www.flux.ai/moshtey/smlp14ecnwt86~ov.md) - Role Details: Rail indicator for 5V rail - Package or Case Code: D_0603_1608Metric - Package: LEDM1608X80 - Mount: Surface Mount - Manufacturer Part Number: SMLP14ECNWT86 - Role: LED - Diode Type: LED - Part Type: LED **Pins:** - 1 [pin 1] - 2 [pin 2] ### D6 — [SMLP14ECNWT86](https://www.flux.ai/moshtey/smlp14ecnwt86~ov.md) - Manufacturer Part Number: SMLP14ECNWT86 - Mount: Surface Mount - Package: LEDM1608X80 - Diode Type: LED - Role: LED - Role Details: Rail indicator for 3.3V rail - Package or Case Code: D_0603_1608Metric - Part Type: LED **Pins:** - 1 [pin 1] - 2 [pin 2] ### D7 — [USBLC6-2P6](https://www.flux.ai/kicad-part-library/usblc6-2p6~djt.md) - Role: Protection - Datasheet URL: https://www.st.com/resource/en/datasheet/usblc6-2.pdf - Manufacturer Name: Texas Instruments Inc. - Role Details: ESD protection for USB D+ and D− lines - Manufacturer Part Number: USBLC6-2P6 - Package: SOT-666 - Package or Case Code: SOT-666 **Pins:** - GND [pin 2] - I/O1 [pin 1] - I/O1 [pin 6] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D7 — [USBLC6-2P6](https://www.flux.ai/kicad-part-library/usblc6-2p6~djt.md) - Package or Case Code: SOT-666 - Role: Protection - Manufacturer Part Number: USBLC6-2P6 - Role Details: Low-capacitance ESD protection for USB D+ and D− lines - Datasheet URL: https://www.st.com/resource/en/datasheet/usblc6-2.pdf - Manufacturer Name: Texas Instruments Inc. **Pins:** - GND [pin 2] - I/O1 [pin 1] - I/O1 [pin 6] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D8 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Manufacturer Part Number: SS14 - Role: Protection - Role Details: Schottky OR-ing diode from USB 5V net to 3.3V LDO VIN - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ - Package: SMA - 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] ### D8, D9 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Manufacturer Part Number: SS14 - Role Details: Schottky OR-ing diode for USB and primary 5V isolation - Part Type: Diode - Role: Protection - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Package: SMA - Manufacturer Name: Slkor(SLKORMICRO Elec.) **Pins:** - Anode [pin A] - Cathode [pin C] ### D8, D9 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Part Type: Diode - Package: SMA - Manufacturer Part Number: SS14 - Role Details: Schottky OR-ing diode for USB and primary 5V isolation - Manufacturer Name: Slkor(SLKORMICRO Elec.) - Role: Protection - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Anode [pin A] - Cathode [pin C] ### D9 — [SS14](https://www.flux.ai/jecstronic/ss14~ri4.md) - Part Type: Diode - Manufacturer Part Number: SS14 - Role Details: Schottky OR-ing diode from primary 5V net to 3.3V LDO VIN - Package: SMA - Role: Protection - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_Slkor-SLKORMICRO-Elec--SS14_C444721.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Slkor(SLKORMICRO Elec.) **Pins:** - Anode [pin A] - Cathode [pin C] ### F1 — [0ZCF0200AF2C](https://www.flux.ai/adrian95/0zcf0200af2c~eal.md) - Role Details: Series fuse for 12V DC input - Role: Protection - Package: FUSC7451X80N - Manufacturer Part Number: 0ZCF0200AF2C - Manufacturer Name: BelFuse - Part Type: Fuse - Package or Case Code: FUSC7451X80N - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://belfuse.com/resources/datasheets/circuitprotection/ds-cp-0zcf-series.pdf **Pins:** - ~ [pin 2] - ~ [pin 1] ### J2 — [0534260210](https://www.flux.ai/jecstronic/0534260210~mh7.md) - Datasheet URL: https://www.molex.com/en-us/products/part-detail/534260210?display=pdf - Mount: Through Hole - Connector Type: Headers and Wire Housings - Part Type: Connector - Package: 534260210 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Manufacturer Name: Molex - Role Details: Logic-level PWM signal header - Manufacturer Part Number: 0534260210 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J3 — [0534260210](https://www.flux.ai/jecstronic/0534260210~mh7.md) - Manufacturer Name: Molex - Manufacturer Part Number: 0534260210 - Role Details: Logic-level PWM signal header - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Package: 534260210 - Datasheet URL: https://www.molex.com/en-us/products/part-detail/534260210?display=pdf - Role: Connector - Connector Type: Headers and Wire Housings - Mount: Through Hole **Pins:** - 1 [pin 1] - 2 [pin 2] ### J4 — [SM03B-GHS-TB(LF)(SN)](https://www.flux.ai/lcsc/sm03b-ghs-tblfsn~j14u.md) - Gender: Female - Role Details: Remote DHT22 sensor connector - LCSC Part Number: C514175 - Connector Type: Header - Rows: 1 - Part Type: Wire To Board / Wire To Wire Connector - Package: SMD, 1.25mm Pitch, Right Angle - Positions: 3 - Manufacturer Name: JST - JLCPCB Part Class: Extended Part - Manufacturer Part Number: SM03B-GHS-TB(LF)(SN) - Pitch: 0.049" (1.25mm) - Package or Case Code: CONN-TH_SM03B-GHS-TB-LF-SN - Role: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### J5 — [SM03B-GHS-TB(LF)(SN)](https://www.flux.ai/lcsc/sm03b-ghs-tblfsn~j14u.md) - LCSC Part Number: C514175 - Role Details: Remote DHT22 sensor connector - Connector Type: Header - Package: SMD, 1.25mm Pitch, Right Angle - Gender: Female - Pitch: 0.049" (1.25mm) - Package or Case Code: CONN-TH_SM03B-GHS-TB-LF-SN - Manufacturer Part Number: SM03B-GHS-TB(LF)(SN) - Manufacturer Name: JST - Positions: 3 - JLCPCB Part Class: Extended Part - Part Type: Wire To Board / Wire To Wire Connector - Rows: 1 - Role: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### J6 — [Pin Header 01x04 2.54mm Vertical i2c](https://www.flux.ai/hasanbasri93/pin-header-01x04-2p54mm-vertical-i2c~37.md) - Connector Positions: 4 - Package or Case Code: CONN-TH - Role Details: I2C expansion header with jumper-disable pull-ups on SDA and SCL - Connector Pitch: 2.54mm - Mount: Through Hole - Package: PinHeader_1x04_P2.54mm_Vertical - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Connector Type: Headers and Wire Housings - Connector Rows: 1 - Part Type: Connector **Pins:** - 5V [pin 1] - GND [pin 2] - SCL [pin 4] - SDA [pin 3] ### J7 — [Pin Header 02x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-02x03-254mm-vertical~z8m.md) - Role Details: ESP32 Programming Header - Connector Positions: 6 - Connector Type: Headers and Wire Housings - Package or Case Code: CONN-TH - Connector Pitch: 2.54mm - License: https://creativecommons.org/licenses/by/4.0/ - Mount: Through Hole - Connector Rows: 2 - Package: PinHeader_2x03_P2.54mm_Vertical - Role: Connector - Part Type: Connector **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] ### J8 — [Type-C-2.0-6Pin](https://www.flux.ai/jharwinbarrozo/type-c-2p0-6pin~wh.md) - Package: Right Angle SMT USB-C - Part Type: Connector - Manufacturer Name: CIKI - Manufacturer Part Number: Type-C-2.0-6Pin - Role Details: USB-C programming port receptacle near ESP32 - Datasheet URL: https://datasheet.lcsc.com/lcsc/2204071830_CIKI-Type-C-2-0-6Pin_C2987385.pdf - Role: Connector **Pins:** - CC1 - CC2 - GND - GND__1 - SHIELD - SHIELD__1 - SHIELD__2 - SHIELD__3 - V-BUS - V-BUS__1 ### J8 — [2024100002](https://www.flux.ai/adrian95/2024100002~atk.md) - Role Details: USB-C programming port receptacle - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Name: Molex - Manufacturer Part Number: 2024100002 - Package: Surface Mount, Right Angle - Role: Connector - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/834/202410002_Pkg_Spec.pdf **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DA- [pin A7] - DA+ [pin A6] - DB- [pin B7] - DB+ [pin B6] - GND1 [pin A1] - GND2 [pin A12] - GND3 [pin B1] - GND4 [pin B12] - RX1- [pin B10] - RX1+ [pin B11] - RX2- [pin A10] - RX2+ [pin A11] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD1 [pin SH1] - SHIELD2 [pin SH2] - SHIELD3 [pin SH3] - SHIELD4 [pin SH4] - TX1- [pin A3] - TX1+ [pin A2] - TX2- [pin B3] - TX2+ [pin B2] - VBUS1 [pin A4] - VBUS2 [pin A9] - VBUS3 [pin B4] - VBUS4 [pin B9] ### LED1 — [SML-LXFM0603SRC-TR](https://www.flux.ai/adrian95/sml-lxfm0603src-tr~r5t.md) - Role Details: Relay status indicator - Manufacturer Part Number: SML-LXFM0603SRC-TR - Role: LED - Diode Type: LED - Manufacturer Name: Lumex Opto/Components Inc. - Package or Case Code: D_0603_1608Metric - Mount: Surface Mount - Package: LEDM1608X80 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/974/SML-LXFM0603SRC-TR_Dwg_RevD_8-26-19.pdf - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [SML-LXFM0603SRC-TR](https://www.flux.ai/adrian95/sml-lxfm0603src-tr~r5t.md) - Role: LED - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/974/SML-LXFM0603SRC-TR_Dwg_RevD_8-26-19.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Package or Case Code: D_0603_1608Metric - Manufacturer Name: Lumex Opto/Components Inc. - Diode Type: LED - Package: LEDM1608X80 - Role Details: Relay status indicator - Manufacturer Part Number: SML-LXFM0603SRC-TR - Mount: Surface Mount **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [SML-LXFM0603SRC-TR](https://www.flux.ai/adrian95/sml-lxfm0603src-tr~r5t.md) - Manufacturer Part Number: SML-LXFM0603SRC-TR - Mount: Surface Mount - Package or Case Code: D_0603_1608Metric - Manufacturer Name: Lumex Opto/Components Inc. - Role Details: Relay status indicator - Package: LEDM1608X80 - Part Type: LED - Diode Type: LED - Role: LED - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/974/SML-LXFM0603SRC-TR_Dwg_RevD_8-26-19.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### LED4 — [SML-LXFM0603SRC-TR](https://www.flux.ai/adrian95/sml-lxfm0603src-tr~r5t.md) - Package: LEDM1608X80 - Diode Type: LED - Package or Case Code: D_0603_1608Metric - Role Details: Relay status indicator - Manufacturer Part Number: SML-LXFM0603SRC-TR - Role: LED - Mount: Surface Mount - Manufacturer Name: Lumex Opto/Components Inc. - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/974/SML-LXFM0603SRC-TR_Dwg_RevD_8-26-19.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### TP_12V — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: Test point for 12V rail - Role: Test Point **Pins:** - P1 ### TP_3V3 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: Test point for 3.3V rail - Role: Test Point **Pins:** - P1 ### TP_5V — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role: Test Point - Role Details: Test point for 5V rail **Pins:** - P1 ### TP_CC1 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Package: 1.25mm SMD - Role Details: CC1 test pad - Role: Test Point **Pins:** - P1 ### TP_CC2 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: CC2 test pad - Package: 1.25mm SMD - Role: Test Point **Pins:** - P1 ### TP_DN — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: USB D– test pad - Package: 1.25mm SMD - Role: Test Point **Pins:** - P1 ### TP_DP — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: USB D+ test pad - Package: 1.25mm SMD - Role: Test Point **Pins:** - P1 ### TP_GND — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role Details: Ground reference test point - Role: Test Point **Pins:** - P1 ### U1 — [ESP32-WROOM-32D](https://www.flux.ai/vasyl/esp32-wroom-32d~7py.md) - Manufacturer Name: Espressif Systems - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf - Manufacturer Part Number: ESP32-WROOM-32D - Role: Main MCU - Part Type: Microcontroller - License: https://creativecommons.org/licenses/by/4.0/ **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] ### U3 — [MCP1825S-3302E/DB](https://www.flux.ai/adrian95/mcp1825s-3302edb~3re.md) - Manufacturer Name: Microchip - Part Type: Power Management - Role: Power Conversion - License: https://creativecommons.org/licenses/by/4.0/ - Package: SOT230P700X180-4N - Datasheet URL: https://datasheet.datasheetarchive.com/originals/distributors/SFDatasheet-4/sf-00090042.pdf - Manufacturer Part Number: MCP1825S-3302E/DB - Package or Case Code: SOT230P700X180-4N - Role Details: 5 V to 3.3 V LDO regulator, 500 mA output, dropout < 200 mV **Pins:** - GND_(TAB)_1 [pin 2] - GND_(TAB)_2 [pin 4] - VIN [pin 1] - VOUT [pin 3] ### U4 — [ULN2803A](https://www.flux.ai/lcsc/uln2803a~i9jk.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410251531_UMW-Youtai-Semiconductor-Co---Ltd--ULN2803A_C845537.pdf - JLCPCB Part Class: Extended Part - Role: Relay Driver - Package or Case Code: SOP-18_L11.4-W7.6-P1.27-LS10.6-BL - Role Details: 4-channel Darlington transistor array for relay coil drivers with integrated flyback diodes - Product Info Url: https://lcsc.com/product-detail/Darlington-transistor-array-driver_UMW-Youtai-Semiconductor-Co-Ltd-ULN2803A_C845537.html - Part Type: Darlington transistor array driver - Manufacturer Name: UMW(友台半导体) - LCSC Part Number: C845537 - Manufacturer Part Number: ULN2803A **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] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/terratronix/ecocore-refboard~w6](https://www.flux.ai/terratronix/ecocore-refboard~w6).* --- *Generated from [https://www.flux.ai/terratronix/ecocore-refboard~w6](https://www.flux.ai/terratronix/ecocore-refboard~w6)*