NOTE: This project was completed in 2019 as a part of my science fair project
This device acts as a multimeter which stores the recorded data values on an SD card. This allows the recorded data to be graphed and analyzed for your own purpose.
For one of my research projects, I needed a way to be able to record the voltage current and power produced by different sets of Solar Panels throughout the day. Because I didn't have access to an oscilloscope and it wasn't feasible for me to record data for all the sets of solar panels at the same time throughout the day. I needed to create a device that would allow me to collect the data I needed.
This is why I ended up creating a power logger that recorded the voltage current and power produced onto an external SD card. I was later able to extract the data from my SD card and graph it.
The following image of the OLED shows the values recorded by the Power Logger. These values are stored as .txt files on an SD card.