This article describes two related capabilities. The first is a hardware interface design that uses 1-wire technology to determine if a piece of equipment is powered ON. The second is a system/software design that describes how room temperature is controlled with a space heater using a Proportional-Derivative software controller, IR and 1-wire sensors.
A classic problem when using IR to control ON/OFF of equipment when only a single ON/OFF IR toggle is available for control is to know the current powered state of the equipment. There are multiple approaches to measure or infer if power is applied. What is described here is a method to use 1-wire technology to provide a positive indication if power is being used by an appliance. The circuit was designed to determine if an IR-controlled space heater is ON or OFF.
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A classic problem when using IR to control ON/OFF of equipment when only a single ON/OFF IR toggle is available for control is to know the current powered state of the equipment. There are multiple approaches to measure or infer if power is applied. What is described here is a method to use 1-wire technology to provide a positive indication if power is being used by an appliance. The circuit was designed to determine if an IR-controlled space heater is ON or OFF.
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