Very simple board with LCD and R8C/33A and one switch - but it runs great in full-sun environments.

This ZIP file includes all Schematic (SCH) and Layout (BRD) files for use with KiCAD. It also includes the custom footprints used in a module file called solar1.mod and a custom library called R8C33.lib.

There is no code included. But the startup code on the test board does use the low-speed internal oscillator in a divide by 8 configuration.