Room

LazyController

A compact WiFi-enabled relay controller built on a custom PCB. Flip switches, trigger appliances, and automate stuff — all from your phone or browser. No getting up required.

BUILD

What is it?

LazyController is an IoT relay board designed around an ESP-based microcontroller. It exposes relay outputs over WiFi, letting you remotely toggle lights, fans, pumps, or anything else you'd rather not walk over to.

• Custom PCB with onboard relay(s)
• WiFi control via a web interface or serial commands
• Compact form factor — designed to tuck away somewhere tidy
• Production-ready Gerbers included for ordering straight from JLCPCB/PCBWay

Repository Layout

LazyController/
├── Cad/          # Enclosure and assembly CAD files
├── Code/         # Firmware source (code.ino)
├── lib/          # README images/assets
├── Pcb/          # KiCad project files (schematic + PCB)
├── production/   # Manufacturing outputs (BOM, positions, netlist, backups)
└── README.md

PCB

The board was designed with simplicity in mind — power in, relay out, WiFi in the middle.

PCB layout and schematic are in the Pcb/ folder.
Gerbers for direct upload to your fab of choice are in production/.

Schematic

ESP

Flashing Firmware

Make sure you have the Arduino IDE or PlatformIO installed.

1. Add ESP32 board support if you haven't already:
   • In Arduino IDE → Preferences → Additional Board URLs:

     https://espressif.github.io/arduino-esp32/package_esp32_index.json

2. Install required libraries:
   • ESPWiFi (or WiFi for ESP32)
   • ESPAsyncWebServer (recommended)
3. Open your firmware sketch, set your WiFi credentials:

   const char* ssid     = "your_network";
   const char* password = "your_password";

4. Select your board, plug in via USB, and hit Upload
5. Open Serial Monitor at 115200 baud — it'll print the device IP once connected

Wiring

Power the controller → relays get activated → each relay switches its connected load.

Relay outputs are SPDT — connect your load between COM and NO (normally open) for off-by-default behaviour.

If switching mains voltage (120V/230V AC), make sure you take appropriate safety precautions.

Usage

Once flashed and powered:

1. Connect to the same WiFi network
2. Open a browser and navigate to the IP shown in Serial Monitor
3. Toggle relays from the web UI — or send HTTP requests directly:

   GET /relay/1/on
   GET /relay/1/off

BOM

• Full BOM sheet: Open Google Sheet

YouTube

• Project video
• More videos soon.

Contact

• Email: me@souptik.me
• Slack: @Souptik Samanta

Funding / Support

• Blueprint
• HackClub