The following items are available for purchase
LongwaveTime HAT
A Raspberry Pi HAT allowing for WWVB, DCF77, MSF, and JJY time signal emulation.
RS-232 Framework Expansion Card
This is an Framework laptop expansion card allowing for RS-232 serial communication.
The following items are OUT OF STOCK at this time
UART Framework Expansion Card
This is an Framework laptop expansion card allowing for 3.3V TTL serial communication.