ESP32 Mini PLC — 4 Input / 4 Relay Output

WiFi programmable logic controller configured entirely from a web browser. No software to install, no programming cable, no licence fees — open the built-in web page and set up your logic in minutes.

ESP32 Mini PLC board with 4 relay outputs, LCD display and WiFi

Try it before you buy — live interactive demo

The exact web interface of the PLC, running in your browser. Load a sample program (motor start/stop, staircase light, tank auto-fill…), click the virtual switches and watch the outputs respond. No hardware needed.

► Open Live Demo

Key Features

Web-Based Configuration Built-in web page — connect from any phone, tablet or PC. Change the control logic anytime without reflashing or tools.	Real PLC Scan Cycle Inputs → logic → outputs scanned continuously like a professional PLC, with input debounce and live status lamps.
4 Isolated Inputs + 4 Relay Outputs Optocoupler-isolated digital inputs and four 10 A relays with NO/COM/NC screw terminals. Status LED on every channel.	Timers, Latches & Toggle Logic Every output supports Direct, On-Delay (TON), Off-Delay (TOF), Toggle flip-flop and Set/Reset latch modes with NO/NC contacts and AND/OR conditions.
Real-Time Clock Scheduling Battery-backed DS3231 RTC with 4 daily time switches — run lights, pumps or motors on schedules (e.g. 18:30 to 06:00), even after power cuts.	LCD Status Display 16x2 LCD shows live input/output states plus IP address and date/time — see what the PLC is doing at a glance.
Remote Control from Your Phone 4 virtual web switches usable inside the logic, plus force ON/OFF buttons for every output for testing and maintenance.	Settings Survive Power Loss All logic and WiFi settings stored in non-volatile memory. The PLC resumes your program automatically at power-on.

ESP32 PLC board layout: opto-isolated inputs, 10A relays, DS3231 RTC, LCD

How It Works

Power up — the PLC creates its own WiFi access point (or joins your router).
Open the web page — type the IP address shown on the LCD into any browser.
Configure your logic — pick conditions (inputs, time switches, web switches), contacts (NO/NC), AND/OR combinations and the output mode for each relay.
Save & Apply — logic runs instantly and is stored permanently.

Logic Modes Per Output

Mode	Behaviour	Typical Use
Direct	Relay follows the condition	Sensor-driven loads, interlocks
On-Delay (TON)	Switches ON after a preset time	Star-delta sequencing, delayed start
Off-Delay (TOF)	Stays ON for a preset time after release	Staircase lighting, fan run-on
Toggle	Each pulse flips the output	Single push-button ON/OFF
Set/Reset Latch	One condition sets, another resets	Motor start/stop stations

Technical Specifications

Controller	ESP32-WROOM-32, dual-core 240 MHz, WiFi 2.4 GHz
Digital inputs	4 x optocoupler isolated, status LED per channel
Relay outputs	4 x 10 A relays, NO/COM/NC screw terminals, status LED per channel
Display	16x2 character LCD (live I/O, IP address, date/time)
Real-time clock	DS3231 with CR2032 battery backup, 4 daily time switches
Configuration	Built-in web page (WiFi station or access-point mode), HTTP API for integration
Logic	4 conditions per output, NO/NC contacts, AND/OR, 5 output modes, timers 0–3600 s
Memory	Non-volatile storage — logic and settings survive power loss
Power supply	12–24 V DC input, on-board buck converter

Applications

Motor start/stop control with latching push-button stations
Scheduled lighting — garden, signage, street lights (RTC time switches)
Water pump automation with level switches and dry-run protection delays
Staircase and corridor lighting with auto-off timers
Two-hand safety start circuits
Remote ON/OFF of equipment from a phone over WiFi
Small machine sequencing and interlocking

What's in the Box

1 x ESP32 Mini PLC board (4 input / 4 relay output) with 16x2 LCD
CR2032 backup battery (installed)
Pluggable screw terminal connectors
Quick-start guide (web setup in 5 minutes)

First use: power the board, connect to WiFi network ESP32-PLC (password 12345678) and open 192.168.4.1 in your browser. Enter your router details once — afterwards the PLC is available on your own network at the address shown on the LCD.

ESP32 Mini PLC – 4 Input / 4 Relay Output WiFi PLC with Web Configuration, LCD & RTC

Product Code: ESP32-PLC-4I4O
Availability: In Stock

Rs3,500.00
5 or more Rs1,600.00
10 or more Rs1,475.00

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