The 4-Channel SPDT Relay HAT for Raspberry Pi utilizes four high-quality SPDT (single pole - double throw) relays and provides NO/NC (Normally Open/ Normally Closed) interfaces that can control the load of high current. This means it could be a nice solution for controlling devices that can't be directly controlled by the I2C bus. The standardized shield form factor enables smooth connection with a and it also has four LED indicators that show the on/off state of each relay. 

Features

• High-quality SPDT (single pole - double throw) relays
• Compatible with Raspberry Pi 1/2/3/4
• I2C interface with three hardware SW1 (1, 2, 3) to select the fixed I2C-bus address
• Relay screw terminals for easy connection 
• Standardized shield shape and design
• LED working status indicators for each relay
• COM, NO (Normally Open), and NC (Normally Closed) relay pins for each relay

Specifications

Hardware Overview

Part List 

1 x 4-Channel SPDT Relay HAT for Raspberry Pi