user_inputs.py

## Create function for prompting the user to input the desired RPM and returns the value to be given to the VFD frequency address
## Returns the string "NaN" if the user input is not a number
## Returns the string "OL" if the user input is outside the limits of 0-60Hz
def set_user_spindle(user_input):
    try:
        speed_int = int(float(user_input))
    except TypeError:
        return "Invalid input"
    except ValueError:
        return "NaN"
    else:
        if isinstance(speed_int, int):
            if speed_int >=7200 and speed_int <=18000:
                # convert to frequency after validating input
                speed_int = round((speed_int / 60) * 10)
                return speed_int
            else:
                return "OL"
        else:
            return "NaN"

def set_user_frequency(user_input):
    try:
        speed_int = int(float(user_input)*10)
    except TypeError:
        return "Invalid input"
    except ValueError:
        return "NaN"
    else:
        if isinstance(speed_int, int):
            if speed_int >=1200 and speed_int <=3000:
                return speed_int
            else:
                return "OL"
        else:
            return "NaN"