8-RELAY Expansion HAT for Raspberry Pi Eight layer stackable: add up to 64 relays to Raspberry Pi Command line, Python drivers Relays max current/voltage: 10A/250V PCB max current/voltage: 2.5A/48V 10 mA @ +5V (all relays off) / 750 mA @ 5V (all relays on) The Sequent Microsystems 8-RELAY Expansion HAT for Raspberry Pi is a stackable expansion card for Raspberry Pi B+, 2, 3 and Zero. It offers a compact and inexpensive solution for adding up to 64 relays to a Raspberry Pi project. Two of the Raspberry Pi’s GPIO pins are used for I2C communication, leaving 24 GPIO pins available for the user. The eight relays are numbered from upper left to lower right. Numbering the Relays is important to associate them correctly with the Relay Headers and Relay LEDs. The Relays are SPST, with three output pins labeled COM, NO, and NC. The Relay LEDs are right angle, to permit visual inspection of the relays status when multiple cards are stacked.
