-The MCU currently runs at 16MHz nut i really need to slow it down as it uses too much power now

-I haven't had much success so far with talking to the SD card

-Still need to test the ADC

-I want to get all the hardware working before writing the software

-I need to get the power consumption as low as possible

-Yes, I am a beginner and this project is supposed to help me pay for a basic lab. I don't have a scope or a decent multimeter, that's why it's a big challenge for me