Trying to control a single sg90 servo with an omega 2+ without the use of the expansion board (for weight-limiting reasons). Can't find any documentation on any python (or c/c++) libraries for controlling servos without the expansion board, is there anywhere outside of the omega 2 documentation?

Things that I've been looking for that I think would help would be a schematic of the pwm expansion's wiring, any gpio python libraries for the omega 2, or just a pwm python library that doesn't have to initialize pwmExp.