ESP32-EVB Evaluation Board Revision K1
Schematic for the Olimex ESP32-EVB Rev K1, featuring Ethernet, CAN bus, LiPo charging, dual relays, and IR communication based on the ESP-WROOM-32 module.
Overview
This hardware design document provides the schematic for the Olimex ESP32-EVB Revision K1, an IoT development board powered by the Espressif Systems ESP-WROOM-32 module. Key features include 10/100 Mbps Ethernet via a Microchip LAN8710A-EZC PHY, CAN bus support using the SIT1050T transceiver, and a CH340T USB-to-UART bridge for programming. The power section includes a Silergy SY8089AAAC buck converter and a BL4054B-42TPRN LiPo battery charger with automatic power-path switching. Peripherals integrated on the board include two Sun Hold RAS-0515 relays, an IR receiver and transmitter, a MicroSD card slot, and expansion headers for UEXT and general-purpose I/O.
Use Cases
- Industrial IoT gateways with Ethernet and CAN connectivity
- Home automation systems requiring relay switching
- Remote monitoring with battery backup and solar charging
- Infrared-controlled appliance interfacing
- Wired-to-wireless networking bridges
Topics
Referenced Parts
ESP-WROOM-32
Espressif Systems
U3 ESP-WROOM-32 MODULE
CH340T
WCH
U5 CH340T(SSOP20W)
MISB-SWMM-5B-LF
Attend
USB-UART1 MISB-SWMM-5B-LF(USB_MICRO)
TFC-WXCP11-08-LF
Attend
MICRO_SD1 TFC-WXCP11-08-LF
RJLD-060TC1
Link-PP
LAN1 RJLD-060TC1(LPJ4013EDNL)
SIT1050T
SIT Semiconductor
U6 SIT1050T(SOIC-8_150mil)
BL4054B-42TPRN
Shanghai Belling
U1 BL4054B-42TPRN(SOT23-5)
SY8089AAAC
Silergy
U2 SY8089AAAC(SOT23-5)
RAS-0515
Sun Hold
REL1A RAS-0515
WPM2015-3/TR
Willsemi
FET1 WPM2015-3/TR
BAT54A
Diodes Inc.
D10 BAT54A(SOT23-3)
BAT54C
Diodes Inc.
U9 BAT54C(SOT23-3)
1N5819S4
Various
D1 1N5819S4(SOD-123)
1N5822
Various
D6 1N5822/SS34/SMA
HX7027
Various
U11 HX7027(SOT-23)
VS1838B
Various
U7 VS1838B
T1107A
Various
RST1 T1107A(6x3,8x2,5MM)
| LAN8710A-EZC | Microchip | U4 LAN8710A-EZC(QFN32) |
| NR3015T2R2M | Taiyo Yuden | L2 2.2uH/1.5A/DCR=72mR/20%/3.00x3.00x1.50mm/CD32(NR3015T2R2M) |
| ESDS314DBVR | Texas Instruments | TVS1 ESDS314DBVR(SOT-23-5) |
| IR333-A | Everlight | LED3 LED/IR333-A/5mm |
| SMBJ6.0A | Littelfuse | D2 SMBJ6.0A(DO-214AA) |
| NCP303LSN27T1G | Onsemi | U8 NA(NCP303LSN27T1G(SOT-23-5)) |
| BSS138 | Onsemi | FET4 BSS138 |
| BC817-40 | Nexperia | Q1 BC817-40(SOT23) |
| ESP-WROOM-32 | Espressif Systems | U3 ESP-WROOM-32 MODULE |
| CH340T | WCH | U5 CH340T(SSOP20W) |
| MISB-SWMM-5B-LF | Attend | USB-UART1 MISB-SWMM-5B-LF(USB_MICRO) |
| TFC-WXCP11-08-LF | Attend | MICRO_SD1 TFC-WXCP11-08-LF |
| RJLD-060TC1 | Link-PP | LAN1 RJLD-060TC1(LPJ4013EDNL) |
| SIT1050T | SIT Semiconductor | U6 SIT1050T(SOIC-8_150mil) |
| BL4054B-42TPRN | Shanghai Belling | U1 BL4054B-42TPRN(SOT23-5) |
| SY8089AAAC | Silergy | U2 SY8089AAAC(SOT23-5) |
| RAS-0515 | Sun Hold | REL1A RAS-0515 |
| WPM2015-3/TR | Willsemi | FET1 WPM2015-3/TR |
| BAT54A | Diodes Inc. | D10 BAT54A(SOT23-3) |
| BAT54C | Diodes Inc. | U9 BAT54C(SOT23-3) |
| 1N5819S4 | Various | D1 1N5819S4(SOD-123) |
| 1N5822 | Various | D6 1N5822/SS34/SMA |
| HX7027 | Various | U11 HX7027(SOT-23) |
| VS1838B | Various | U7 VS1838B |
| T1107A | Various | RST1 T1107A(6x3,8x2,5MM) |