Adafruit PiRTC - Precise DS3231 Real Time Clock for Raspberry Pi _MAKE_DISPLAY_OLED The Arduino Ethernet2 library works

The Arduino Ethernet2 library works great

Relays are rated 10A/24VDC and 250VAC

in order to increase the current limit of each output the 2 changeover contacts have been put in parallel

With different DSP settings

6 total SERCOMs that can each do SPI

Adafruit PiRTC - Precise DS3231 Real Time Clock for Raspberry Pi _MAKE_DISPLAY_OLED The Arduino Ethernet2 library worksThis is the best battery backed real time clock (RTC) you can get that allows your Raspberry Pi project to keep track of time if the power is lost. Perfect for data logging, clock building, NTP servers, time stamping, timers and alarms, etc. Equipped with a genuine DS3231 RTC, it works great with the Raspberry Pi and has native kernel support. The datasheet for the DS3231 explains that this part is an "Extremely Accurate IC Integrated RTC TCXO