Universal minicomputer with STM32F103C6 microcontroller (ARM...
ISP programmer for CPLD from Xilinx and AVR microcontroller (compatible...
Adafruit 255 - ChronoDot - Ultra-precise Real Time Clock - v2.1
This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. Adafruit 264
DS3231 Precision RTC FeatherWing adds an extremely accurate I2C-integrated Real Time Clock (RTC) with a Temperature Compensated Crystal Oscillator (TCXO) to any Feather main board. Adafruit 3028
Clock & Timer Development Tools Gravity I2C SD2405 RTC. DFR0469
Real-time clock module with M41T56C64
DS1307 Real Time Clock Module with AT24C32 Memory, I2C, RoHS
2.8 inch Arduino Touch LCD Shield