Arduino Projects For Beginners: Build A Web-Controlled Climate And Motion Monitor Arduino Projects For Beginners: Build A Web-Controlled Climate And Motion Monitor Mold in my home was the main reason I built this device. Mold needs moisture to grow, and persistently high indoor humidity can keep walls, furniture, and other surfaces damp enough to support it. I wanted real measurements that would show when the room was becoming too humid, plus remote control of my air conditio