ESPHome and Home Assistant Beginner Guide: Build Your First WiFi Sensor

ESPHome and Home Assistant Beginner Guide: Build Your First WiFi Sensor ESPHome turns an ESP32 into a smart home sensor or controller with almost no code. Combined with Home Assistant, it is the most powerful DIY home automation setup available. What You Will Build A WiFi temperature and humidity sensor that reports every 30 seconds to Home Assistant, appears automatically in your dashboard, and survives reboots. Total hardware cost: under $10. Hardware Needed ESP32 DevKit (~$5) BME280 temperature/humidity/pressure sensor (~$4) — recommended over DHT22 for accuracy USB cable, jumper wires Wire the BME280 (I2C) Install ESPHome In Home Assistant: Settings → Add-ons → Add-on Store → search ESPHome → Install → Start. Create Your Device ESPHome dashboard → New Device → name it → Edit. Paste this configuration: yaml esphome: name: workshop-sensor friendlyname: Workshop Sensor esp32: board: esp32dev logger: api: encryption: key: !secret apikey ota: password: !secret otapassword wifi: ssid: !secret wifissid password: !secret wifipassword ap: ssid: "Fallback Hotspot" password: "fallback123" i2c: sda: GPIO21 scl: GPIO22 sensor: - platform: bme280i2c temperature: name: "Temperature" pressure: name: "Pressure" humidity: name: "Humidity" address: 0x76 updateinterval: 30s Flash Your ESP32 ESPHome dashboard → Install → Plug into this computer → select USB port → Install. First flash takes 2–3 minutes to compile. Future updates are wireless (OTA). Connect to Home Assistant HA will auto-discover the device. Settings → Devices & Services → Configure. Your sensors are now available for automations and dashboards. What to Build Next ESPHome supports nearly any hardware with simple YAML additions: Motion sensor (PIR) — trigger automations on presence Door/window sensor (reed switch) — detect open/close RGB LED controller — control strips from HA Smart relay switch — control lights or appliances CO2 monitor (MH-Z19B) — air quality Water leak detector — under-sink protection Energy monitor (PZEM-004T) — whole-home power monitoring Each takes 10–30 lines of YAML and works exactly like the temperature sensor. ESPHome vs Tasmota Both flash open-source firmware to ESP devices. ESPHome is YAML-configured and tightly integrated with Home Assistant. Tasmota works with more platforms but is more complex. If you use HA, ESPHome wins.

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