Id like to try a design involving parts running at 1.8V.
Do I have any option to power the board at 1.8V? I have an extarnal psu.
Sure - are you looking to use our A La Carte system? https://alc.sparkfun.com/?_ga=2.4773910 … 9MQAvD_BwE
It will walk you through the steps of creating a 1.8v board
We also have parts/boards/power options here https://www.sparkfun.com/search/results?term=1.8v
Be sure to check out the level shifters.