# ESP32-WROOM-32E Reference Design eA8F 699d ## Description This project is a reference design for an ESP32-WROOM-32E based device. It features USB-C for power and data transfer, onboard voltage regulation, and multiple peripheral connections. It also includes a CH340C for USB to serial conversion #referenceDesign #project #ESP32 #ESP32WROOM #RF #WIFI #MCU #referenceDesign #simple-embedded #espressif #template #reference-design ## Project Details - **Owner:** professorhulk - **Created:** 6/17/2025 - **Last Updated:** 6/17/2025 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ - **Forks:** 1 ## Key Components ### 220 ohm R5 — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor.md) - Resistance: 220Ω - Package: SMD_0603_1608Metric - Part Type: Resistor **Pins:** - P1 [pin 1] - P2 [pin 2] ### BOOT — [PTS815](https://www.flux.ai/vasy_skral/pts815.md) - Manufacturer Part Number: PTS815 SJM 250 SMTR LFS - Manufacturer Name: C&K - Part Type: Switch - Datasheet URL: https://www.ckswitches.com/media/2728/pts815.pdf **Pins:** - ~1 [pin 1] - ~2 [pin 2] - ~3 [pin 3] - ~4 [pin 4] ### Cvm2 — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Part Type: Non-Polarized Capacitor - Role: Decoupling - Package: SMD_0603_1608Metric **Pins:** - P1 [pin 1] - P2 [pin 2] ### D1 — [1N5819HW-7-F](https://www.flux.ai/jecstronic/1n5819hw-7-f.md) - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds30217.pdf - Manufacturer Name: Diodes Incorporated - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N5819HW-7-F **Pins:** - A [pin 2] - K [pin 1] ### D2 — [WE-TVS-82400102](https://www.flux.ai/vasy_skral/we-tvs-82400102.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Würth Elektronik - Part Type: Protection - Datasheet URL: https://katalog.we-online.de/pbs/datasheet/82400102.pdf - Manufacturer Part Number: 82400102 **Pins:** - GND [pin 2] - IO1 [pin 6] - IO1 [pin 1] - IO2 [pin 4] - IO2 [pin 3] - VDD [pin 5] ### D3 — [SM712](https://www.flux.ai/jecstronic/sm712.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SM712 - Part Type: Diode - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/NextGen%20Components%20PDFs/SOT23SM712S712.pdf - Manufacturer Name: MDD **Pins:** - A1 [pin 1] - A2 [pin 2] - common [pin 3] ### IC1 — [CH340C](https://www.flux.ai/vasyl/ch340c.md) - Manufacturer Part Number: CH340C - Manufacturer Name: Wah - Part Type: Integrated Circuit - Datasheet URL: https://datasheet.lcsc.com/szlcsc/Jiangsu-Qin-Heng-CH340C_C84681.pdf **Pins:** - ~CTS [pin 9] - ~DCD [pin 12] - ~DSR [pin 10] - ~DTR [pin 13] - ~RI [pin 11] - ~RTS [pin 14] - GND [pin 1] - NC [pin 7] - NC [pin 8] - R232 [pin 15] - RXD [pin 3] - TXD [pin 2] - UD- [pin 6] - UD+ [pin 5] - V3 [pin 4] - VCC [pin 16] ### IC2 — [MAX3485CSA+](https://www.flux.ai/vasyl/max3485csaplus.md) - Manufacturer Part Number: MAX3485CSA+ - Manufacturer Name: Maxim Integrated - Datasheet URL: https://datasheets.maximintegrated.com/en/ds/MAX3483-MAX3491.pdf - Part Type: Integrated Circuit **Pins:** - ~RE [pin 2] - A [pin 6] - B [pin 7] - DE [pin 3] - DI [pin 4] - GND [pin 5] - RO [pin 1] - VCC [pin 8] ### J10 — [2-Position Screw Terminal](https://www.flux.ai/corynrobinson/2-position-screw-terminal.md) - Manufacturer Name: Würth Elektrik - Part Type: Connector - Manufacturer Part Number: 691137710002 - Datasheet URL: https://www.we-online.com/katalog/datasheet/691137710002.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [Pin Header 01x04 2.54mm Vertical without Designators](https://www.flux.ai/markwuflux/pin-header-01x04-2p54mm-vertical-without-designators.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 1] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J4 — [B4B-XH-A(LF)(SN)](https://www.flux.ai/adrian95/b4b-xh-alfsn.md) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/eXH.pdf - Manufacturer Part Number: B4B-XH-A(LF)(SN) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Name: JST Sales America Inc. **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### LED1 — [LED 0805 (2012 Metric)](https://www.flux.ai/vasyl/led-0805-2012-metric.md) - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LED simulator template](https://www.flux.ai/nico/example-led-simulator-template.md) - Forward Voltage: 1.70V - Part Type: LED - Datasheet URL: https://page.venkel.com/hubfs/Resources/Datasheets/LEDs/CTL1206FYW1T.pdf - Manufacturer Part Number: CTL1206FYW1T **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [LED simulator template](https://www.flux.ai/nico/example-led-simulator-template.md) - Forward Voltage: 1.70V - Part Type: LED - Datasheet URL: https://page.venkel.com/hubfs/Resources/Datasheets/LEDs/CTL1206FYW1T.pdf - Manufacturer Part Number: CTL1206FYW1T **Pins:** - A [pin 2] - K [pin 1] ### PWR — [LED-0805-Template-2](https://www.flux.ai/vasy_skral/led-0805-template-2.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### Q1 — BSS138 - Manufacturer Part Number: BSS138 - Part Type: Transistor - Manufacturer Name: onsemi - Datasheet URL: https://www.onsemi.com/pdf/datasheet/bss138-d.pdf **Pins:** - D - G - S ### Q2 — BSS138 - Manufacturer Part Number: BSS138 - Manufacturer Name: onsemi - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/bss138-d.pdf **Pins:** - D - G - S ### RST — [PTS815](https://www.flux.ai/vasy_skral/pts815.md) - Datasheet URL: https://www.ckswitches.com/media/2728/pts815.pdf - Manufacturer Name: C&K - Part Type: Switch - Manufacturer Part Number: PTS815 SJM 250 SMTR LFS **Pins:** - ~1 [pin 1] - ~2 [pin 2] - ~3 [pin 3] - ~4 [pin 4] ### U1 — [AMS1117-3.3](https://www.flux.ai/vasy_skral/ams1117-33.md) - Part Type: Integrated Circuit - Manufacturer Part Number: AMS1117-3.3 - Manufacturer Name: AMS - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811021917_Advanced-Monolithic-Systems-AMS1117_C6188.pdf **Pins:** - GND [pin 1] - TAB(VOUT) [pin 4] - VIN [pin 3] - VOUT [pin 2] ### U2 — [ESP32-WROOM-32E](https://www.flux.ai/vasy_skral/esp32-wroom-32e.md) - Part Type: Integrated Circuit - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf - Manufacturer Part Number: ESP32-WROOM-32E - Manufacturer Name: Espressif Systems - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - GND=> . [pin 15] - EN [pin 3] - GND [pin 38] - GND [pin 39] - 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 18] - NC [pin 19] - NC [pin 17] - NC [pin 21] - NC [pin 22] - NC [pin 32] - NC [pin 20] - RXD0/IO3 [pin 34] - SENSOR_VN [pin 5] - SENSOR_VP [pin 4] - TXD0/IO1 [pin 35] - VDD [pin 2] ### U3 — [TMC2209_STEPPER_MOTOR SILENTSTEPSTICK](https://www.flux.ai/saxonm/tmc2209steppermotor-silentstepstick.md) - Manufacturer Name: BIGTREETECH - Datasheet URL: https://github.com/bigtreetech/BIGTREETECH-TMC2209-V1.2/blob/master/manual/TMC2209-V1.2-manual.pdf - Manufacturer Part Number: BIGTREETECH-TMC2209-V1.2 - License: https://tapr.org/the-tapr-open-hardware-license/ - Part Type: Integrated Circuit **Pins:** - 1A [pin 12] - 1B [pin 11] - 2A [pin 13] - 2B [pin 14] - CLK [pin 6] - DIR [pin 8] - ENABLE [pin 1] - GND [pin 15] - GND [pin 9] - MS1 [pin 2] - MS2 [pin 3] - PDN (UART) [pin 5] - PDN (UART) [pin 4] - STEP [pin 7] - VDD [pin 10] - VMOT [pin 16] ### U4 — [B3B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b3b-xh-alfsn.md) - Manufacturer Name: JST - Connector Rows: 1 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B3B-XH-A-LF-SN_C144394.pdf - Connector Pitch: 2.50mm - JLCPCB Part Class: Extended Part - Connector Type: Headers and Wire Housings - Part Type: Wire To Board / Wire To Wire Connector - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST-Sales-America_B3B-XH-A-LF-SN_JST-Sales-America-B3B-XH-A-LF-SN_C144394.html - Manufacturer Part Number: B3B-XH-A(LF)(SN) - Connector Positions: 3 - Package or Case Code: CONN-TH_3P-P2.50_A2501WV2-3P - LCSC Part Number: C144394 - Operating Temperature: -25°C ~ 85°C - Voltage Rating: 250V - Current Rating: 3A **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### U5 — [B3B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b3b-xh-alfsn.md) - LCSC Part Number: C144394 - Operating Temperature: -25°C ~ 85°C - Current Rating: 3A - Voltage Rating: 250V - Manufacturer Part Number: B3B-XH-A(LF)(SN) - Connector Positions: 3 - Package or Case Code: CONN-TH_3P-P2.50_A2501WV2-3P - Connector Type: Headers and Wire Housings - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST-Sales-America_B3B-XH-A-LF-SN_JST-Sales-America-B3B-XH-A-LF-SN_C144394.html - Part Type: Wire To Board / Wire To Wire Connector - Manufacturer Name: JST - Connector Rows: 1 - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B3B-XH-A-LF-SN_C144394.pdf - Connector Pitch: 2.50mm **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### U6 — [B3B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b3b-xh-alfsn.md) - Package or Case Code: CONN-TH_3P-P2.50_A2501WV2-3P - Connector Positions: 3 - Manufacturer Part Number: B3B-XH-A(LF)(SN) - Current Rating: 3A - Voltage Rating: 250V - Operating Temperature: -25°C ~ 85°C - LCSC Part Number: C144394 - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B3B-XH-A-LF-SN_C144394.pdf - Connector Pitch: 2.50mm - Connector Rows: 1 - Manufacturer Name: JST - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST-Sales-America_B3B-XH-A-LF-SN_JST-Sales-America-B3B-XH-A-LF-SN_C144394.html - Part Type: Wire To Board / Wire To Wire Connector - Connector Type: Headers and Wire Housings **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### U7 — [B3B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b3b-xh-alfsn.md) - Part Type: Wire To Board / Wire To Wire Connector - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST-Sales-America_B3B-XH-A-LF-SN_JST-Sales-America-B3B-XH-A-LF-SN_C144394.html - Connector Type: Headers and Wire Housings - Connector Rows: 1 - Connector Pitch: 2.50mm - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B3B-XH-A-LF-SN_C144394.pdf - JLCPCB Part Class: Extended Part - Manufacturer Name: JST - Operating Temperature: -25°C ~ 85°C - Current Rating: 3A - Voltage Rating: 250V - LCSC Part Number: C144394 - Package or Case Code: CONN-TH_3P-P2.50_A2501WV2-3P - Manufacturer Part Number: B3B-XH-A(LF)(SN) - Connector Positions: 3 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### U8 — [B3B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b3b-xh-alfsn.md) - Operating Temperature: -25°C ~ 85°C - Voltage Rating: 250V - Current Rating: 3A - LCSC Part Number: C144394 - Package or Case Code: CONN-TH_3P-P2.50_A2501WV2-3P - Manufacturer Part Number: B3B-XH-A(LF)(SN) - Connector Positions: 3 - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST-Sales-America_B3B-XH-A-LF-SN_JST-Sales-America-B3B-XH-A-LF-SN_C144394.html - Part Type: Wire To Board / Wire To Wire Connector - Connector Type: Headers and Wire Housings - Connector Rows: 1 - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B3B-XH-A-LF-SN_C144394.pdf - Connector Pitch: 2.50mm - Manufacturer Name: JST **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### USB1 — [TYPE-C-31-M-12](https://www.flux.ai/vasy_skral/type-c-31-m-12.md) - Part Type: Connector - Datasheet URL: https://datasheet.lcsc.com/lcsc/2205251630_Korean-Hroparts-Elec-TYPE-C-31-M-12_C165948.pdf - Manufacturer Name: Korean Hroparts Elec - Manufacturer Part Number: TYPE-C-31-M-12 **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin B1A12] - GND [pin A1B12] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin S3] - SHIELD [pin S1] - SHIELD [pin S4] - SHIELD [pin S2] - VBUS [pin A4B9] - VBUS [pin B4A9] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/professorhulk/esp32-wroom-32e-reference-design-ea8f-699d](https://www.flux.ai/professorhulk/esp32-wroom-32e-reference-design-ea8f-699d).* --- *Generated from [https://www.flux.ai/professorhulk/esp32-wroom-32e-reference-design-ea8f-699d](https://www.flux.ai/professorhulk/esp32-wroom-32e-reference-design-ea8f-699d)*