Martin writes:
The ESP8266 DHT22/LED blinker project grew into a M2M relay board project with the following features in mind:
- Relatively small (10x5cm) PCB
- Powered via on-board power supply or externally via a micro-USB plug
- Has three 2A Sharp Solid State Relays (later version has 8A SSR)
- DHT22 humidity/temperature and/or DS18b20 temperature sensor support to use for thermostat purposes
- WiFi (of course) in Static/Dynamic IP mode
- Native MQTT support (both publish and subscribe, controlling the relays and reading sensors over MQTT)
- HTTP/JSON API for setting/getting relay board properties
- Fancy jQuery UI for remote control via smartphone/tablet/laptop from anywhere in the world
- Web-configurable WiFi/MQTT/Sensor settings
- NTP support
- In the pipeline
- Basic HTTP authentication to protect the web interface
- Dynamic DNS support so that the module’s IP is always known
- I2C status display support
- Custom made plastic box/cover
- Scheduling functionality