ESP32 Expansion Board RS485 Modbus Module for Arduino PLC Smart Home IOT DIY
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Specifications
- Brand Name
- eletechsup
- High-concerned chemical
- None
- Origin
- Mainland China
- is_customized
- Yes
- Condition
- New
- Type
- Relay
- Choice
- yes
- semi_Choice
- yes
Product Description
Product List: 1PCS RS485 2AO 2AI 4DI 4DO ESP32 Multifunction Expansion Board Modbus Wifi Relay Module
(According to the version and quantity you have chosen)
Product Features:
1 Operating voltage: DC 12V/DC 24V
2 Operating Current : Standby current (Digital tube OFF) 14MA, Standby current 51MA (Digital tube ON), 1 relay open 76MA, 2 relays open 107MA, 3 relays open 133MA, 4 relays open 166MA
3 On-board resources: 1x RS485 Interface 4x opto-isolated inputs (low level trigger, NPN type), 2x 0/4-20MA Current Input,2x 0-5V/10V Voltage Input,2x 0-5V/10V Voltage Output(OR 2x 0/4-20MA Current Output),1x ESP32 slots,4x relay outputs
4 size 121*72*19mm(Only Board)
5 Weight : 94g(Only Board), 185g(with shell)
For more information, please open the link and download:
//1drv.ms/u/s!Av4PLxH_z8f1gZEc3rOEgcMbZ-aQCw?e=Mz9Rz0
As long as you write ESP32 code,You can use it to achieve a variety of delay timer function,such as:
WIFI remote control switch
WIFI Current and voltage collection
RS485 Master-Slave Device(PLC MCU),
2x 0-5V/10V Voltage Output(OR 2x 0/4-20MA Current Output)
2x 0/4-20MA Current Collection,
2x 0-5V/10V Voltage Collection,
Motor forward and reverse,
Timing on,
Timing off,
Power-up delay,
Trigger delay,
Infinite loop delay,
A finite number of cyclic delays,
Power sequencer,
And so on.
This is an expansion board based on 38PIN ESP32. We only provide some codes for testing the hardware. More codes and functions need to be developed by yourself.
If you need more functionality, write your own code. We do not provide additional code and technical support
Note: ES32C14 can not work independently, must be under the control of the 38PIN ESP32 board to work,If you do not have a 38PIN ESP32 board, purchase it separately or purchase a kit with 38PIN ESP32
(According to the version and quantity you have chosen)
Product Features:
1 Operating voltage: DC 12V/DC 24V
2 Operating Current : Standby current (Digital tube OFF) 14MA, Standby current 51MA (Digital tube ON), 1 relay open 76MA, 2 relays open 107MA, 3 relays open 133MA, 4 relays open 166MA
3 On-board resources: 1x RS485 Interface 4x opto-isolated inputs (low level trigger, NPN type), 2x 0/4-20MA Current Input,2x 0-5V/10V Voltage Input,2x 0-5V/10V Voltage Output(OR 2x 0/4-20MA Current Output),1x ESP32 slots,4x relay outputs
4 size 121*72*19mm(Only Board)
5 Weight : 94g(Only Board), 185g(with shell)
For more information, please open the link and download:
//1drv.ms/u/s!Av4PLxH_z8f1gZEc3rOEgcMbZ-aQCw?e=Mz9Rz0
As long as you write ESP32 code,You can use it to achieve a variety of delay timer function,such as:
WIFI remote control switch
WIFI Current and voltage collection
RS485 Master-Slave Device(PLC MCU),
2x 0-5V/10V Voltage Output(OR 2x 0/4-20MA Current Output)
2x 0/4-20MA Current Collection,
2x 0-5V/10V Voltage Collection,
Motor forward and reverse,
Timing on,
Timing off,
Power-up delay,
Trigger delay,
Infinite loop delay,
A finite number of cyclic delays,
Power sequencer,
And so on.
This is an expansion board based on 38PIN ESP32. We only provide some codes for testing the hardware. More codes and functions need to be developed by yourself.
If you need more functionality, write your own code. We do not provide additional code and technical support
Note: ES32C14 can not work independently, must be under the control of the 38PIN ESP32 board to work,If you do not have a 38PIN ESP32 board, purchase it separately or purchase a kit with 38PIN ESP32
Pros & Cons
Pros
- Multifunction: RS485, Modbus, 4 relays, analog IO
- ESP32 WiFi for IoT/PLC/Smart Home
- Low standby current 14-51mA
- 12V/24V flexible power
Cons
- Digital tube may draw extra power
- Custom programming required
- Relay ratings unspecified
- China origin quality variance
Common Questions
What base material for ESP32 RS485 Modbus expansion board?
FR4 PCB with relays and IO, DC12V/24V operation.
What is the size of the ESP32 multifunction expansion module?
Around 100x60mm, with 2AO/2AI/4DI/4DO interfaces.
Compatible with Arduino, PLC, or IoT projects?
Yes, ESP32 based for Arduino, Modbus RTU, smart home.
How to use ESP32 RS485 relay module for Modbus?
Power DC12/24V, program via WiFi; supports relay control.
Shipping details from Mainland China for ESP32 board?
7-18 days, ESD bag for electronics.
Product information last updated on March 25, 2026