-- Called when a new gyroscope measurement has been received.
local function onGyroscopeDataReceived( event )
    -- Calculate approximate rotation traveled via deltaTime.
    -- Remember that rotation rate is in radians per second.
    local deltaRadians = event.xRotation * event.deltaTime
    local deltaDegrees = deltaRadians * (180 / math.pi)
end
 
-- Set up the above function to receive gyroscope events if the sensor exists.
if system.hasEventSource( "gyroscope" ) then
    Runtime:addEventListener( "gyroscope", onGyroscopeDataReceived )
end