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ESP smart switch

Overview

Project Objective:
In today's booming smart home market, some older homes, or even rented apartments, face challenges in installing smart home systems due to wiring or other reasons. This project aims to create a small module that allows users with some DIY skills to experience low-latency smart control without altering existing switches and wiring.
Hardware:
ESP12 + magnetic latching relay, along with a DH11 temperature and humidity module and a photoresistor.
Software:
ESPHOME programming is used, requiring only simple configuration and offering convenient online OTA updates.
Results:
This module enables smart control of lights without altering existing switch wiring, maintaining the original switch functionality. It also caters to those unfamiliar with smart home systems, providing a seamless transition.
Note:
The PCB DRC may report pads being too close to the slot. This is intentional for easier soldering. This board has been verified and functions correctly.
Because my ESPHOME server is not on the same network segment, I used MQTT to connect to Home Assistant; using ESPHOME directly would be more convenient.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-27 11:39:08

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