Climate Control with OTA

Read the temperture and humidity with ESPHome and update code over-the-air. Step-by-step guide with explanations.

Climate Control Project with OTA

Project Overview

This project shows how to control a DHT22 via ESPHome with OTA updates. You can integrate it with Home Assistant.

Step-by-Step Guide

  1. Wire the AM2302(dht) to your ESP32/ESP8266 board.
  2. Upload the ESPHome YAML configuration with OTA enabled.
  3. Add the device to Home Assistant for remote control.
  4. Test relay control and OTA updates.

Build hardware

First we wire the hardware, in this case we use a WEMOS D1-mini with a DHT22

DHT22 sensor wiring

ESPHome YAML


esphome:
  name: livingroom_sensor
  platform: ESP8266
  board: d1_mini

wifi:
  ssid: "MyWiFi"
  password: "MyPassword"

sensor:
  - platform: dht
    pin: D2
    model: DHT22
    temperature:
      name: ""Living Room Temperature"
    humidity:
      name: "Living Room Humidity"
    update_interval: 10s
Click button to copy code
Breakdown:
  • esphome: Defines the device name, platform, and board type.
  • wifi: Your WiFi SSID and password for network connection.
  • ota: Enables Over-The-Air updates for easy code deployment.
  • sensor: Configures a GPIO pin to control a DHT22, you can see outcome in Home Assistant.

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  min_auth_mode: WPA2

WiFi Configuration Explained:

  • ssid: The name of your WiFi network, stored securely in the secrets.yaml file.
  • password: The password for your WiFi network, also stored in secrets.yaml.
  • min_auth_mode: Sets the minimum authentication mode; WPA2 is recommended for security.

Using !secret keeps your sensitive WiFi credentials out of the main configuration file, which is a best practice for ESPHome projects.


sensor:
  - platform: dht
    pin: D2
    model: DHT22
    temperature:
      name: ""Living Room Temperature"
    humidity:
      name: "Living Room Humidity"
    update_interval: 10s

What each line means:

  • platform: dht – Uses the DHT sensor platform.
  • pin: D4 – The GPIO pin where the sensor's data pin is connected.
  • model: DHT22 – Specifies the sensor type (DHT22 / AM2302).
  • temperature → name – The name that appears in Home Assistant.
  • humidity → name – The humidity reading name in Home Assistant.
  • update_interval: 10s – Reads the sensor every 10 seconds.
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