Ever wanted to automate your home by controlling AC appliances like light or fan? Well, this HAT might be perfect for you if you are using Raspberry Pi as the controller. This HAT Relay Board gives your RPi the ability to control high voltage/high current devices, easily makes normal home appliances become intelligent. Board Overview: Raspberry Pi GPIO interface: Stack on Raspberry Pi Relay screw terminal: for connecting target devices, AC or DC load. Relays Photocoupler: PC817 Relay indicator LEDs LED on: relay NC is opened, NO is closed LED off: relay NC is closed, NO is opened Power indicator Relay control jumper short the jumper: control the relays by default I/Os used in the example code open the jumper: control the relays by custom I/Os through jumper wires Dimensions: Features Supports Raspberry Pi Zero/Zero W/Zero WH/A /3B/3B /3A /4B High quality relays, loads up to 5A 250V AC or 5A 30V DC Photo coupling isolation, prevent interference from high voltage circuit Onboard LEDs for indicating relays status Relay control jumper, allows to control the relays by custom pins other than the default pins Comes with development resources, including examples in wiringPi, WebioPi, shell, python, and BCM2835 Packing List 1 x HAT Relay board 2 x 15mm spacer (2.00 mm diameter) with screws and nuts Resources Wiki page Schematic Libraries Installation for Raspberry Pi WebIOPi-0.7.1