An isolated image of an ESP32.

Espressif Systems ESP32

The ESP32 is a low-cost, low-power microcontroller with integrated Wi-Fi and Bluetooth capabilities, developed by Espressif Systems. One of the main features of the ESP32 is its dual-core processor, which allows it to perform tasks concurrently and makes it suitable for a wide range of applications. The ESP32 also has a built-in Wi-Fi and Bluetooth module, which makes it easy to connect to the internet and other devices wirelessly. It is commonly used in a variety of applications, including Internet of Things (IoT) devices, home automation systems, and portable projects.

Espressif Systems ESP32 guides

The ESPHome powered multisensor

Building a multisensor is one of the first things you should when starting off with ESPHome. The sensors are cheap, the wiring isn't complicated, and you get your first taste of creating custom firmware for an ESP8266 .