Abstract: A temperature-controlled counter/clock arrangement is provided where th rate or frequency of the counting is temperature dependent. This allows for a measuring of thermal accumulation and/or history. The temperature sensing is based upon the use of the varying current that will flow through a toward biased semiconductor diode. In one embodiment a constant voltage source is used so that the current variation will follow Arrhenius's law.

Abstract: A method of communicating information between a host device and a potentially portable module device which measures thermal accumulation over time via a temperature controlled counter. The temperature controlled counter may operate using substantially Arrhenius' law. The host device communicates with the portable module via a single wire bidirectional data bus. The single wire bus and one-wire communication protocol allows data flow between a host and a plurality of devices connected to the single wire bus. The single wire bus allows for a great versatility of uses for the portable module.

Abstract: A wireless-accessible module which provides first and second wireless-transmitter control signals, such that the first transmitter control signal can be activated automatically, in response to incoming wireless signals, but the second transmitter control signal can only be activated by manual input or direct command. Preferably the two control signal outputs are used to select the power level of transmission on a single predetermined frequency; but alternatively these outputs may be used to control two different RF transmitters and/or two different antennas.