https://github.com/yoheiocean/two-wire-heat-only-thermostat
A smart thermostat using the ESP32 S3 Devkit to replace an outdated two-wire heat-only thermostat.
https://github.com/yoheiocean/two-wire-heat-only-thermostat
dht11 esp32 esp32-idf esp32-s3 esphome home-assistant home-automation ssd1306 thermostat
Last synced: 6 months ago
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A smart thermostat using the ESP32 S3 Devkit to replace an outdated two-wire heat-only thermostat.
- Host: GitHub
- URL: https://github.com/yoheiocean/two-wire-heat-only-thermostat
- Owner: yoheiocean
- Created: 2024-08-14T07:12:20.000Z (about 1 year ago)
- Default Branch: main
- Last Pushed: 2024-10-23T05:14:47.000Z (12 months ago)
- Last Synced: 2025-02-14T05:18:39.566Z (8 months ago)
- Topics: dht11, esp32, esp32-idf, esp32-s3, esphome, home-assistant, home-automation, ssd1306, thermostat
- Homepage:
- Size: 14.1 MB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Two-wire Heat-only Smart Thermostat with ESP32 S3
## Introduction
This project aims to replace an old, two-wire heat-only thermostat with a modern smart thermostat using ESPHome on an ESP32. The smart thermostat will feature a user interface on an OLED display, temperature control through physical buttons, and integration with Home Assistant for smart home automation.
## Materials Used
To build this smart thermostat, you will need the following components:
* **[ESP32 S3 DevKitC-1](https://docs.espressif.com/projects/esp-idf/en/stable/esp32s3/hw-reference/esp32s3/user-guide-devkitc-1-v1.0.html)**: The main microcontroller for the project.
* **I2C SSD1306 OLED Display (128x32)**: For displaying temperature and system status.
* **5V Relay**: To control the heater.
* **DHT11 Temperature and Humidity Sensor**: For measuring the ambient temperature.
* **3 Push Buttons**: For controlling the heater (on/off) and adjusting the target temperature.
## Wiring Diagram
Below is the wiring diagram for connecting the components:
* **ESP32 S3 Devkit**
* **5V** to **5V Relay VCC**
* **GND** to **5V Relay GND**
* **GPIO 6** to **Relay IN** (Control signal)
* **GPIO 4** to **DHT11 Data Pin**
* **GPIO 42** to **Button 1 (On/Off)**
* **GPIO 38** to **Button 2 (Temp Up)**
* **GPIO 45** to **Button 3 (Temp Down)**
* **SSD1306 SCL** to **ESP32 GPIO 9** (SCL)
* **SSD1306 SDA** to **ESP32 GPIO 8** (SDA)
* **SSD1306 Reset** set to **GPIO 3**
* **Onboard RGB** set to **GPIO 48** (For v.1.1, use GPIO 38)
**Note**: Internal pull-ups were used for buttons. No resistors were necessary.
**Note**: The diagram shows a DS18B20 temperature sensor.
## Connecting to Existing Williams Thermostat
To connect the ESP32 smart thermostat to your existing Williams heater:
1. **Turn Off Power**: Ensure the power to the existing thermostat and heater is turned off before making any connections.
2. **Disconnect Old Thermostat**: Remove the two wires connected to the old thermostat.
3. **Connect Wires**: Connect these two wires to the **NO (Normally Open) terminals** of the 5V relay. The relay will act as a switch to control the heater.
