HardLabs

ESP 8 Relay Module

thermseekr·eumesmo-io-24v16ch·oldversions/V1/esp-relay-16ch-v1.kicad_pcb

ESP 8 Relay Module layout, top view — open source ESP32 board by thermseekr

About the ESP 8 Relay Module

ESP 8 Relay Module is an open source ESP32 PCB design by thermseekr, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 148 × 67.8 mm, with 271 components from 55 distinct parts.

Its main chip is the ESP32-WROOM-32E(8MB), from the ESP32 family. Other key parts include the TX4138, SY8089A1AAC, LTV-817S-TA1-C, CH340C and PCF8574TS/3,118. By type, the board carries 126 resistors, 54 diodes, 38 capacitors, 24 ICs, 19 transistors and 5 connectors.

From the project

ESP32-based industrial I/O board. 16x optoisolated 24VDC inputs, 16x transistor outputs. 1-Wire interface. DIN rail compatible.

The outputs are based on the MMBT2222A SMD transistor and are rated for a maximum of 500mA, although it is recommended to limit the current to 350 mA for continous operation. If driving inductive loads like relays, a freewheeling diode or a snubber circuit should be used to limit the switching transients and protect the transistors.

Also included is a 1-Wire interface for external sensors. This interface can be switched to connect either to GPIO16 for use with a bitbang driver like the one available in Tasmota, or to a DS2482S-100 1-Wire master for building more complex networks. Selection…

ESP 8 Relay Module, from the project README
From the project README

Main components on the ESP 8 Relay Module

TX4138SY8089A1AACLTV-817S-TA1-CCH340CESP32-WROOM-32E(8MB)PCF8574TS/3,118LAN8710A-EZC-TR

ESP 8 Relay Module bill of materials (BOM)

271 components, 55 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TX4138
U1
1
SY8089A1AAC
U2
16
LTV-817S-TA1-C
LTV-817S
U3, U4, U5, U6, U7, U8, U9, U10 +8
1
CH340C
U19
1
ESP32-WROOM-32E(8MB)
ESP32-WROOM-32E-8MB
U20
3
PCF8574TS/3,118
PCF8574TS
U21, U22, U23
1
LAN8710A-EZC-TR
LAN8710A
U24
1
WPM2015-3/TR
Q1
1
LMUN2211LT1G
Q2
1
UMH3N
Q3
16
MMBT2222A
MMBT2222A/SOT-23-3
Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11 +8
1
1x LM 5.08/02/90 3.5SN OR BX
VIN
J1
1
10118194-0001LF
USB
J2
1
250-208
DIG IN
J3
1
HR911105A
ETHERNET
J4
1
250-202
DIG OUT
J5
1
JFC0402-0500FS
500mA
F1
1
TS-1092S-B3D2-G
RESET
SW1
1
SM4007PL
SM4007PL/SOD-123
D1
33
19-217/BHC-ZL1M2RY/3T
BLUE/0603
D2, D6, D8, D10, D12, D14, D16, D18 +25
Show 35 more
QtyPartRefs
1
SS510
D3
1
SS34
D4
1
B5819W
D5
16
ZMM5239B
9V1/500mW
D7, D9, D11, D13, D15, D17, D19, D21 +8
1
ESDS314DBVR
ESDS314DBV
D38
1
SWRH1205B-330MT
33uH 2,1A
L1
1
SPH3015H2R2MT
2,2uH 1,5A
L2
1
CBM201209U601T
2A 600R
L3
1
CK1V470MCRE54
47uF/35V/6,3x5,4
C1
3
CC0805KRX7R9BB104
0,1uF/50V/0805
C2, C3, C28
1
CL10C120JB8NNNC
12pF/50V/0603
C4
1
VZH471M1CTR-1010
470uF/16V/10x10
C5
2
CL31A106KOHNNNE
10uF/16V/1206
C6, C8
1
CL10C220JB8NNNC
22pF/50V/0603
C7
5
CL10A106MQ8NNNC
10uF/6,3V/0603
C9, C10, C27, C32, C38
16
0805B333K500NT
33nF/50V/0805
C11, C12, C13, C14, C15, C16, C17, C18 +8
1
CL10A105KP8NNNC
1uF/10V/0603
C29
4
CL05B104KO5NNNC
0,1uF/16V/0402
C30, C33, C34, C35
1
CC1206MKX7RDBB102
1nF/2kV/1206
C31
1
CL05A105KQ5NNNC
1uF/6,3V/0402
C36
1
CC0402KRX7R7BB471
470pF/16V/0402
C37
33
0603WAF5601T5E
5,6k/0,1W/0603
R1, R10, R13, R16, R19, R22, R25, R28 +25
1
0805W4F300MT5E
30mR/0,250W/0805
R2
1
0805W8F510KT5E
5R1/0,125W/0805
R3
1
0805W8F3003T5E
300k/0,125W/0805
R4
1
0805W8F5232T5E
52,3k/0,125W/0805
R5
1
0805W8F1003T5E
100k/0,125W/0805
R6
1
0805W8F2212T5E
22,1k/0,125W/0805
R7
21
0402WGF1002TCE
10k/62,5mW/0402
R8, R58, R59, R60, R73, R79, R82, R85 +13
17
0402WGF1001TCE
1k/62,5mW/0402
R9, R80, R83, R86, R89, R92, R95, R98 +9
16
1206W4F1201T5E
1k2/0,250W/1206
R11, R14, R17, R20, R23, R26, R29, R32 +8
26
0402WGF3301TCE
3k3/62,5mW/0402
R12, R15, R18, R21, R24, R27, R30, R33 +18
2
0402WGF3300TCE
330R/62,5mW/0402
R63, R64
1
0402WGF1212TCE
12,1k/62,5mW/0402
R74
4
0402WGF499JTCE
49,9R/62,5mW/0402
R75, R76, R77, R78

ESP 8 Relay Module design files

The KiCad project lives in the thermseekr/eumesmo-io-24v16ch repository on GitHub; these links point at the commit this page was built from.

ESP 8 Relay Module: common questions

What microcontroller does the ESP 8 Relay Module use?

The ESP 8 Relay Module is built around the ESP32-WROOM-32E(8MB), from the ESP32 family.

How big is the ESP 8 Relay Module?

The ESP 8 Relay Module measures 148 × 67.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP 8 Relay Module?

271 components, from 55 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 8 Relay Module design files?

From the thermseekr/eumesmo-io-24v16ch 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 8 Relay Module design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the ESP 8 Relay Module 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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