This is a small pcb that is designed to be used on an electric go-kart to display a stopwatch, motor RPMs, and cart speed as well as record this data on an SD card with a time stamp for analysis. The project is Arduino based and is ran off of 7-59 VDC or directly from a 5V source through any of the 5V or VIN pins on the data logger shield (this is not a protected input). It is designed to have wires soldered in the spots for the power input, the power switch, the start & stop buttons, and the hall effect sensor that goes to the axle. The device is calibrated through variables for wheel diameter and gear ratio from the motor to the axle. To upload the sketch use the ICSP (In Circuit Serial Programmer) headers found on the data logger shield. Source Code: https://github.com/Ccope19/E-Kart-Data-Recorder Will include a link to an instructable w/ assembly and code... this is a full project you can copy.