WiFi IoT 3 channel relay board with MQTT and HTTP API using ESP8266

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...