How do I make running a double-tapped W?

I've tried changing r to ww but it just doesn't work. This is my current script and R is just a place holder key until I can change it to double w.

local player = game.Players.LocalPlayer local character = player.Character local humanoid = character.Humanoid local mouse = player:GetMouse() local origSpeed = humanoid.WalkSpeed local runSpeed = 30 --change for faster or slower

mouse.KeyDown:connect(function(key)
    if key:lower() == "r" then
        humanoid.WalkSpeed = runSpeed      
    end
end)
 
mouse.KeyUp:connect(function(key)
    if key:lower() == "r" then
        humanoid.WalkSpeed = origSpeed
    end
end)

The script works perfectly fine, it's just that I want the R to be a double W tap.

If you want the key to be pressed twice, you can make a variable that checks if it was previously.

local CAS = game:GetService("ContextActionService") --A game service responsible to bind and unbind a action.
local isPressedOnce = false
local function dash(actionName,inputState,inputObject)
	if inputState == Enum.UserInputState.Begin then
		if isPressedOnce == false then -- when the "w" is pressed the first time, this statement will be true.
			isPressedOnce = true --this will allow the statement below to be true
				wait(1)
			isPressedOnce = false
		elseif isPressedOnce == true then --if the button is pressed the second time, it will run.
			--dash
			isPressedOnce = false
		end
	end
end

Cas:BindAction("Dash"--[[Action Name--]],dash--[[function--]],false--[[if this is true, it will make a dash button on mobile device--]],Enum.KeyCode.W--[[key to activate the function--]])

This way, it will detect your key to be pressed, and if this is the second time pressed it will fire. Also, I think you should use ContextActionService as I did in the example.