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ESP-32-RELAY-CONTROLLER

pasachan·ESP-32-RELAY-CONTROLLER·hardware/kicad/esp32-relay-controller.kicad_pcb

ESP-32-RELAY-CONTROLLER PCB layout, top view — open source ESP32 board by pasachan

About the ESP-32-RELAY-CONTROLLER PCB

ESP-32-RELAY-CONTROLLER is an open source ESP32 PCB design by pasachan, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 124.8 × 68 mm, with 97 components from 48 distinct parts.

Its main chip is the ESP32-WROOM-32D-N16, from the ESP32 family. Other key parts include the LMR51430XDDCR, USBLC6-2SC6, CH340C, ULN2803A and MAX3485AEASA+T. By type, the board carries 23 capacitors, 23 resistors, 12 connectors, 12 diodes, 8 relays and 7 ICs.

It belongs with the iot & wireless designs in this gallery.

From the project

An 8-channel relay controller with Wi-Fi, an RS-485 field bus, and a 12 V power rail for downstream nodes. Designed as the master board for a small home-automation network: this board switches loads directly, talks to the outside world over Wi-Fi, and powers and polls a chain of low-cost slave boards (ATtiny / STM32 class) over RS-485.

An 8-channel relay controller with Wi-Fi, an RS-485 field bus, and a 12 V power rail for downstream nodes. Designed as the master board for a small home-automation network: this board switches loads directly, talks to the outside world over Wi-Fi, and powers and polls a chain of low-cost slave boards (ATtiny / STM32 class) over RS-485.

Open hardware. KiCad 10 source, fabrication outputs, BOMs with LCSC part numbers, and a pick-and-place file are all in this repository. Rev 1 has been manufactured.

ESP-32-RELAY-CONTROLLER, from the project README
From the project README

Main components on the ESP-32-RELAY-CONTROLLER

ESP32-WROOM-32D-N16LMR51430XDDCRUSBLC6-2SC6CH340CULN2803AMAX3485AEASA+T

ESP-32-RELAY-CONTROLLER bill of materials (BOM)

97 components, 48 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-WROOM-32D-N16
ESP32-WROOM-32D
Espressif
U1
2
LMR51430XDDCR
LMR51430
Texas Instruments
U2, U3
1
USBLC6-2SC6
STMicroelectronics
U4
1
CH340C
WCH
U6
1
ULN2803A
UMW
U7
1
MAX3485AEASA+T
Analog Devices / Maxim
U9
1
IRF4905PBF
IRF4905
Infineon
Q1
3
SS8050(RANGE:200-350)
SS8050
Changjiang Microelectronics
Q2, Q3, Q5
1
MX126-5.0-02P-GN01-Cu-S-A
Power Input +12V
MAX / MaiXu
J1
8
MX126-5.0-03P-GN01-Cu-S-A
Screw_Terminal_01x03
MAX / MaiXu
J2, J3, J4, J6, J8, J9, J10, J11
1
USB4105-GF-A-120
USB_C_Receptacle_USB2.0_16P
GCT
J5
1
MX126-5.0-02P-GN01-Cu-S-A
S1
MAX / MaiXu
J7
1
MX126-5.0-04P-GN01-Cu-S-A
Screw_Terminal_01x04
MAX / MaiXu
J12
1
TMB12A05
Huaneng
Buzzer1
1
PZ254V-11-02P
Jumper_2_Open
XFCN
JP1
8
SRD-S-105D
SANYOU
K2, K3, K4, K5, K6, K7, K8, K9
1
TS-1102-4316
RESET
SOFNG
SW1
1
TS-1102-4316
BOOT
SOFNG
SW2
1
TS-1102-4316
WPS
SOFNG
SW3
2
1N4148WT-7
Diodes Incorporated
D1, D13
Show 28 more
QtyPartRefs
1
SMBJ18CA
RUILON
D2
2
CUS10S30
DOWO
D3, D4
1
BZX84-C16,235
BZX84-C16
Nexperia
D5
1
CDSOT23-SM712
Bourns
D6
2
CT-0201URC-P4
BOOT LED
CHONGTIAN
D7, D11
1
PESD3V3S1UB
TECH PUBLIC
D8
1
CT-0201URC-P4
5V LED
CHONGTIAN
D9
1
WS2812B-B/T
WS2812B
Worldsemi
D15
1
APH0630T6R8M
6.8 uh
APV
L1
1
FXL0630-5R6-M
5.6uh
Changjiang Microelectronics
L2
1
ZEMS0420-220M
10uH 4.5A
ZE
L3
1
RVT1V471M1010 470UF 35V
470uf 35v
DMBJ
C1
1
JBLM2101M035C070RTM 100UF 35V
100uf 35v
DMBJ
C2
10
CL10B104KB8NNNC
100nf 50V
Samsung Electro-Mechanics
C3, C4, C5, C6, C9, C14, C17, C18 +2
4
CL21A226KOQNNNE
22uf 16v
Samsung Electro-Mechanics
C7, C8, C10, C11
3
GRM21BR61H106KE43L
10uf 50V
Murata
C12, C13, C15
2
CL10A105KB8NNNC
1uF 50V
Samsung Electro-Mechanics
C19, C20
2
CL10A106MA8NRNC
10uF 25V
Samsung Electro-Mechanics
C21, C22
3
0603WAF1003T5E
100k
UNI-ROYAL
R1, R3, R5
1
0603WAF1372T5E
13.7k
UNI-ROYAL
R2
1
FRC0603F2212TS
22.1k
FOJAN
R4
2
0603WAF5101T5E
5.1k
UNI-ROYAL
R6, R7
7
0603WAF1002T5E
10K
UNI-ROYAL
R8, R9, R10, R15, R22, R24, R25
3
0603WAF4701T5E
4.7k
UNI-ROYAL
R14, R18, R40
1
0603WAF1200T5E
120
UNI-ROYAL
R23
3
0603WAF3300T5E
330
UNI-ROYAL
R26, R27, R42
1
0603WAF1001T5E
330
UNI-ROYAL
R37
1
0603WAF1001T5E
1k
UNI-ROYAL
R38

ESP-32-RELAY-CONTROLLER design files

The KiCad project lives in the pasachan/ESP-32-RELAY-CONTROLLER repository on GitHub; these links point at the commit this page was built from.

ESP-32-RELAY-CONTROLLER: common questions

What microcontroller does the ESP-32-RELAY-CONTROLLER use?

The ESP-32-RELAY-CONTROLLER is built around the ESP32-WROOM-32D-N16, from the ESP32 family.

How big is the ESP-32-RELAY-CONTROLLER PCB?

The ESP-32-RELAY-CONTROLLER measures 124.8 × 68 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP-32-RELAY-CONTROLLER?

97 components, from 48 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the ESP-32-RELAY-CONTROLLER design files?

From the pasachan/ESP-32-RELAY-CONTROLLER repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the ESP-32-RELAY-CONTROLLER design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which pasachan chose for the repository.

Can I test firmware for the ESP-32-RELAY-CONTROLLER without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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