Solid State Relay - 40A (3-32V DC Input) wireless 56MHz 1K card

56MHz 1K card

and more detailed information about I²C in general can be found in NXP’s I²C-bus specification (371k pdf)

This board/chip uses I2C 7-bit address between 0x40-0x7F

Later Raspberry Pi Zero models require an adapter FPC

Solid State Relay - 40A (3-32V DC Input) wireless 56MHz 1K cardA solid state relay (SSR) allows you to control high curent AC loads from lower voltage DC control circuitry. Solid state relays have several advantages over mechanical relays. One such advantage is that they can be switched by a much lower voltage and at a much lower current than most mechanical relays. Also, because there's no moving contacts, solid state relays can be switched much faster and for much longer periods without wearing out. This