double motor_curve(double input) {
   	//convert from -127 to 127 into -100 to 100
	input = (input * (127.0f / 100.0f));
	char toggle;
	if (input < 0) {
    	toggle = -1;
    } else {
    	toggle = 1;
    }
	//convert back and do final calculations
    return (100.0f / 127.0f) * (toggle * (std::exp((toggle * input) * 0.04615)));
}