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Powerful Standalone Home Automation System - Pi, Sonoff, ESP8266 and Node-Red
Self Sustained Automatic Watering System (Arduino, bare minimal configuration)
A compact, Arduino altimeter for RC Planes
Home Automation using Raspberry Pi, Arduino, Domoticz, MySensors.
The Sketch for the gateway you will upload to the arduino that works as the gateway. Your sensor's sketch will be uploaded to your node (not to the gateway). So you need ONE arduino for the gateway. Thi will send/receive information from/to your server.And you will need one arduino for each node you build. In one node you can use more than one sensor it you need.For example you can have a node to read temperature, humidity, level of something, open/close sensor and a relay do activate something.The controller will see that node plus each sensors.The most common is to have one sensor per node, but you can have multiple
Web Controlled LED Info Ticker
DIY: Relay switch motor controller - Arduino
Make a Fun Paper Planes Launcher
Internet Controlled Arduino (no Ethernet shield)
Yet Another Arduino 110v Power Controller