ESC3E05 ESP32-C3 IoT Relay Controller – 4AI 4DO RS485 Industrial I/O Expansion Module for Arduino DC 9V/12V/24V

ESC3E05 is an ESP32 C3 Super Mini expansion board developed by eletechsup. It has 4 relay outputs and an RS485 bus interface, and the remaining pins are exposed. It is characterized by its small size and can be easily used in compact occasions.

Product Features:
1 Operating voltage: DC 7-25V
2 Operating Current : Standby current 14MA, 1 relay open 75MA, 2 relays open 106MA, 3 relays open 131MA, 4 relays open 163MA
3 On-board resources: 1x RS485 Interface,,4x relay outputs,6x 3.3V common IO port,4x 0-3V Analog acquisition port (multiplexed D0 D1 D3 D4),1x ESP32 C3 Super Mini socket.
4 With high-speed RS485 interface (Baud Rate 0.05K-1000KBPS)
5 Optional industrial standard DIN rail enclosure
6 Terminal spacing: 3.96mm.
7 Terminal Blocks: Wire Range 26-16AWG, Strip Length 3.96mm, Metric M2/M2.5 Slotted Screws.
8 Size: 75 *50 * 12mm(only Board),80 *54 * 31mm(with Rail Box)
9 Weight : 45g(Only Board), 76g(With DIN Box)


As long as you write ESP32-C3 code,You can use it to achieve a variety of delay timer function,such as:
WIFI remote control switch
WIFI voltage collection
RS485 Master-Slave Device(PLC MCU),
4x 0-3V Voltage Collection,
4x 3.3V NPN PNP DI
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 16PIN C3 Super Mini. We only provide some Arduino 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: ESC3E05 can not work independently, must be under the control of the 16PIN ESP32 C3 Super Mini board to work,If you do not have a ESP32 C3 Super Mini board, purchase it separately

DIN rail Box parameters:
Product model: UM50
Color: Black
Width: suitable for PCB board width UM50(50mm)
Insulation grade: flame-retardant VO grade
Backplane length: suitable for 75 mm PCB boards
Net weight: 30g
Installation: DIN35 and C45 rail