ccbRegisterKeyDownEvent("keyPressedDown");

function keyPressedDown(keyCode)
{
   if(keyCode == 70){ ccbSetCopperCubeVariable("F_Down","true");]
}

var cube = ccbGetSceneNodeFromName("cubeMesh1"); // get cube node
var startTime = Date.now(); // get ms when app starts
var step = 250; // change to control flicker rate
var interval = step; // interval to add step amount to
var key; // var to hold key code
var pressed = false; // boolean for key press or not

// function to set/unset cube visible
function flicker(node) {
    var a = ccbGetSceneNodeProperty(node, "Visible"); // get node

    // toggle visiblity 
    if (a) {
        ccbSetSceneNodeProperty(node, "Visible", false);
    } else {
        ccbSetSceneNodeProperty(node, "Visible", true);
    }
}

// key down event
function keyDown(keyCode) {
    key = keyCode;
    pressed = true;
}

// key up event
function keyUp(keyCode) {
    key = keyCode;
    pressed = false;
}

// "game loop"
function game() {
    var now = Date.now(); // ms when loop starts
    var timeMs = now - startTime; // current time

    if (timeMs >= interval) {
        if (key == 70 && pressed == true) {
            flicker(cube); // flicker the cube

            interval += step; // increment interval
        } else {
            ccbSetSceneNodeProperty(cube, "Visible", true);
        }
    }
}

// register key events
ccbRegisterKeyDownEvent("keyDown");
ccbRegisterKeyUpEvent("keyUp");

// registers "game loop"
ccbRegisterOnFrameEvent(game);

 ccbEmulateKey(70, true)