ESP32 Expansion Board WiFi RS485 8Relay 4-20mA 0-10V Input for Arduino PLC Industrial Automation Smart Home DIY Arduino Web MQTT Ethernet Network (12V Relay with Shell)

Note!!! PWR LED does not light up when powered on. Driven by the IO port of the ESP32Product Features:1. Working voltage: DC 12V-24V2.Working Current : Standby current (Digital tube OFF) 15MA, Standby current 50MA (Digital tube ON), 1 relay open 76MA, 2 relays open 107MA, 8 relays open 292MA3.On-board resources: 1x RS485 Interface 8x opto-isolated inputs (low level trigger, NPN type), 4x 0/4-20MA Current Input,4x 0-5V/10V Voltage Input,4x buttons, 1x 4 bit digital tube display, 1x ESP32 slots, 8x relay outputsES32A08(Relay Module):Size 180*72*20mm(Only Board)Weight : 189g(Only Board), 317g(with shell)ES33B08(Darlington tube Module):Size 123*72*20mm(Only Board)Weight : 93g(Only Board), 184g(with shell)Please contact me for more information!Purchase Notes:1.ES32A08/ES33B08 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 ESP322.This is an expansion board based on 38PIN ESP32. We only provide three vscode codes for testing the hardware. More codes and functions need to be developed by yourself.3.If you need more functionality, write your own code. We do not provide additional code and technical support4 .The acquisition accuracy of analog quantities is determined by the ESP32 board. It is recommended to collect multiple times to obtain the average value.As long as you write ESP32 code,You can use it to achieve a variety of delay timer function,such as:WIFI remote control switchWIFI Current and voltage collectionhome automation/Smart home DIYRS485 Master-Slave Device(PLC MCU),4x 0/4-20MA Current Collection,4x 0-5V/10V Voltage Collection,Motor forward and reverse,Timing ON/OFFPower-up Delay,Trigger delay,Infinite loop delay,A finite number of cyclic delays,Power sequencer,And so on.Application 1: Through the programming of 38Pin ESP32, various delay customization functions can be realized instead of PLC.Application 2: It can be used as an RS485 master device instead of PLC/PC/touch screen to control various RS485 slave devices.

• 工作电压：DC 12V-24V
• Working Current : Standby current (Digital tube OFF) 15MA, Standby current 50MA (Digital tube ON), 1 relay open 76MA, 2 relays open 107MA, 8 relays open 292MA
• Multi-Protocol Industrial Control & Smart Home Integration WiFi, RS485, MQTT & Ethernet support for flexible IoT connectivity.
• Opto-Isolated Inputs & ESP32 Programmability enables custom solutions like motor control, timed switches, and power sequencers.
• Replace PLC/PC/Touchscreens as an RS485 master device or create WiFi remote controls.
• Arduino/PLC-Compatible with 12-24V DC input for seamless integration.