TEC-1G Real Time Clock Module v1.2

You ever had someone look at your beloved TEC-1 and ask, "So what can it do?" Well now you can turn it into a functional and accurate clock with this Real Time Clock module!

How Does it Work

The main chip is the DS1302 which, coupled with the crystal, keeps very accurate time that can be read in a serial manner. That is what the rest of the chips in this circuit are for; to manage the serial communications. The DS1302 also has 31 bytes of RAM that the monitor (v1.4 onwards) uses for storing settings, rather than forgetting them every time you switch the TEC-1G off. Both the clock and the RAM are battery backed with the CR2032 coin cell. (Battery NOT included in the Kit.)

TEC-1G Connectors Option

If you purchased a full TEC-1G kit up to June 2025, you would have ALL the connectors included, and thus DON'T need the expansion connectors added. However, in an effort to reduce the initial cost of the base kit (and to make it less arduous on the initial soldering), only the essential connectors were included in the base TEC-1G kit from July 2025. Also, if you pulled the parts together yourself and didn't bother with the connectors, then you can buy the required connectors for the TEC-1G motherboard as an add-on to this kit.

This policy will be extended to all Expansion Kits, but you only need to add this on ONCE for each group of expansion boards, not with EVERY Expansion Kit you purchase. The SD Card uses the GPIO expansion slot, so this Kit Option gets you:

• 1 x 20 pin (2x10) female vertical socket (GPIO bus)
• 1 x 2 pin female vertical socket (Power)