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ESP32-EVB Evaluation Board Schematic (Rev A)

Hardware schematic for the Olimex ESP32-EVB featuring the ESP-WROOM-32 module, 10/100 Ethernet, dual relays, Li-Po battery charging, and microSD card support.

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Overview

This schematic provides the hardware design for the ESP32-EVB evaluation board from Olimex. The design is centered on the Espressif ESP-WROOM-32 module, providing Wi-Fi and Bluetooth connectivity. Key peripheral integration includes a Microchip LAN8710A Ethernet PHY for RMII-based wired networking, a Microchip MCP73833 Li-Po battery charger, and two 10A/250VAC RAS-0515 relays controlled via BC817 transistors. The power management section utilizes a Silergy SY8009 buck converter to provide a stable 3.3V rail. Additional features include a microSD card slot, an Olimex UEXT connector, two user buttons, and a 40-pin extension header for GPIO access.

Use Cases

  • IoT gateway development with Ethernet and Wi-Fi
  • Home automation and remote relay control
  • Battery-powered IoT sensor nodes
  • Industrial monitoring and control systems
  • ESP32 hardware prototyping and evaluation

Topics

ESP-WROOM-32
LAN8710A
MCP73833
ESP32
Ethernet
Relay
Li-Po Charger
SY8009AAAC
MicroSD
UEXT
Olimex
IoT

Referenced Parts

1N5819

Stmicroelectronics

1N5819(S4 SOD-123)

1N5822

Stmicroelectronics

D4 1N5822/SS34/SMA

ESP-WROOM-32

Espressif Systems

U3 ESP-WROOM-32 MODULE

IRLML6402

Infineon

FET1 IRLML6402

MCP73833

Microchip

U1 MCP73833(MSOP10)

SY8009AAAC

Silergy

U2 SY8009AAAC(SOT23-5)

DG306-5.0-3P

Degson

TB3 DG306-5.0-3P

RJLD-060TC1

Link-PP

LAN1 RJLD-060TC1(LPJ4013EDNL)

DG306-5.0-2P

Degson

PWR2 NA(TB2 DG306-5.0-2P)

RAS-0515

SUN HOLD

REL1A RAS-0515

TFC-WXCP11-08-LF

TFC

MICRO_SD1 TFC-WXCP11-08-LF

T1107A

Unknown

T1107A(6x3,8x2,5MM)

BH10S

Unknown

UEXT1 BH10S

YDJ-1134

Unknown

PWRJ-2mm(YDJ-1134)

ESP32-EVB Evaluation Board Schematic (Rev A) | Design Resources