=== Angle grinder cutting detection === A vibration sensor will detect any attempt at cutting through the rod with an angle grinder. An ultra-violet sensor will detect a cutting torch.
=== Make steel rod part of electronic loop === Run a small current through the 2cm thick , 4m long steel rod, measuring its impedance in real-time. Any flame cutting of the steel rod will influence the resistance of the rod because of its change in temperature. The colder a piece of metal the less its resistance. By running a constant current through the steel rod any change in resistance will change the voltage. This voltage is measured by an A/D converter and an alert triggered. The whole post rod becomes an electronic circuit which must be isolated from ground so that the measurement current isn't shorted.
=== PIR inside steel pipe === To unlock the rod you must place your hand inside the steel post ancored on one side of the entrance. A PIR/Ultrasonic distance measurement circuit will detect this.
=== Keypad deactivation === For added security and to prevent the unlocking of the rod under duress, place a keypad besides the post. A correct code must be entered or the Ultrasonic/PIR combination will send an alert to the base via a [[GpsGprs]], [[MeshNetworking]], [[RS485]] or [[RadioModems]] combination.