Speed Controller

--Speed Controller
--Consts--
local motor = peripheral.find("electric_motor")

term.clear()
term.scroll(-2)

while true do
    term.scroll(-1)
    print("Enter Speed: ")
    local input = read()

    if input:match("^%-?%d+$") then
        local num = tonumber(input, 10)
        if num > 256 or num < -256 then
            print("[ERROR]: Invalid Number, Number must be between 256 and -256")
        else
            motor.setSpeed(num)
            print("[INFO]: Speed was successfully set to " .. num)
        end
    else
        print("[ERROR]: Input was not a number.")
    end
    sleep(2)
    term.clear()
end