Smell Sensor lite (com.oddrising.android.smellsensorlite) on Google Play
Use this smell sensor to mess around with your siblings or friends. Ever wanted to tell someone they stink but couldn't say it? Now you can with this easy to use app. Simply tilt the device slightly up to decrease the sensor reading or down to increase it until the device starts beeping. You may even configure the tilt and other features through settings. Can your smartphone take a whiff? find out!