16 SOLID STATE RELAYS for RASPBERRY Pi Copycat of our 16-RELAYS HAT, with one significant difference: Solid State instead of mechanical relays. While mechanical relays are very reliable and have close to zero ohms resistance on contacts, they have a limitation in the number of lifetime cycles.
The relays we use on the 16-RELAY HAT have a Mechanical Life of 1,000,000 operations. While this might be OK if relays are not triggered too often, what if your application requires 1 second intervals? A relay might engage 3,600 times an hour, or 86.400 times each day. It will run out of cycles in less than 2 weeks, which is clearly a major drawback.
The 16 Solid State Relays HAT overcomes this limitation, having an infinite number of lifetime cycles. The Solid State Relay HAT is software compatible with the 16 Relays HAT and can be stacked up to 8 levels in combination with all other Sequent Microsystems cards equipped with a processor.
Perfect add-on to your project when you have to control large number of loads. Stackable to 8 layers, the card can add up to 128 relays to each Raspberry Pi in a compact form factor. Pluggable connectors make the card easy to use when multiple cards are stacked up. Bicolor LEDs conveniently grouped on one side of the board show when relays are on or off. A power LED shows when power is applied. A reset switch permits shutting down the Raspberry Pi without the use of a keyboard and monitor.
COMPATIBILITY The card is compatible with all Raspberry Pi versions from Zero to 5. All stacked cards share the I2C bus using only two of the Raspberry Pi's GPIO pins to manage all eight cards. This feature leaves the remaining 24 GPIOs available for the user.
POWER REQUIREMENTS The 16-RELAY card needs 5V to operate and can be powered from Raspberry Pi or from it's own 2 pin pluggable connector. The card draws 20mA. If pow