Anavi Technology has previously launched ESP8266-based home automation boars for use with the Raspberry Pi, including the Anavi Thermometer, Light Controller, and Infrared pHAT, along with several others. The open source hardware company has recently introduced a new board that makes use of ESP8266 platform, with the Anavi Gas Detector, which monitors air quality, and detects toxic gases.
The Gas Detector is powered by an ESP8266 WiSoC for wireless connectivity and compatible with the MQ series of gas sensors, including the MQ-135, MQ-2, or MQ-3. The development board also features slots for a mini OLED display, and up to three additional I2C sensor modules, such as an HTU21D digital sensor for measuring temperature and humidity.
As far as hardware and specs go, the Anavi Gas Detector sports an ESP8266 Tensilica L106 32-bit processor with integrated 802.11b/g/n Wi-Fi, support for any 5V MQ analog gas sensor, 3X slots for I2C sensors, mini OLED display slot, UART pins for custom firmware, button, and micro USB port for power and programming.
On the software side, the Gas Detector works with a host of operating systems — Arduino IDE, PlatformIO, Home Assistant, OpenHAB, ThingSpeak, and MQTT, as well as any modern web browser. The Anavi Gas Detector is currently being crowdfunded, and can be had as a barebones board for $25 or in a kit form at the higher-priced tiers, which come with an acrylic case, OLED display, and a variety of sensors (HTU21D, MQ-135, pressure/barometric pressure, light, humidity, etc.) and connection cables.