Design Scenario

When the top knob of the cookies jar is touched, the Force Sensitive Resistor which is embedded in the top knob will be trigger, and as the lid is being lifted, the Photoresistor would also be activated. These two sensors combined would set off a warning to the cookies jar owner, informing the owner that the safety of the cookies has been compromised!

Meanwhile, when the owner wants to eat a cookie in the jar, the owner could avoid tipping off the alarm by not touching the top knob, but lift the lid by holding the whole top instead. Bon Appétit!