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For IR Temperature sensor, researched working principle, various technicalities such as Field of View, emissivity, etc.
Did basic search for remote temperature sensing technologies. Best solutions are IR sensors.
Focused on the interoperability of digital IR sensors with Xbee. Compared IC based to other packaging type such as TO-39.
Narrowed choice down to models of one specific sensor from Melexis.
Research methods of interfacing current output type or voltage output type current sensors with Xbee Pro modules.
Came to conclusion for creating voltage divider circuit with half wave rectification for the input signal.
Did research on current sensing technologies. Identified Hall Effect sensors as the most suitable technology. Compared various packages, such as Current Transducer with voltage output and current sensor with current output.
Compared IC vs Transformer based current sensing. Worked out basic interfacing with Xbee Pro and narrowed down selection field for the exact component.
Researched Zigbee modules focusing on the interfacing protocols. Compared electrical characteristics of I/O pins, Analog/ADC pins. Understood technicalities of using different types of modules and benefits/drawback for different types of modules.
Researched various Zigbee+MCU modules. Compared communication protocols, ADC input and output voltages and recommended Xbee Pro as the best fit.
Did basic search for viable technologies to come up with a reasonable estimate for prototyping the sensors.
Based on using Arduino as the prototyping platform.
Researched various models of IR sensors and narrowed down the field to a model from Melexis.
Characteristics that were considered include power consumption, price, packaging, field of view, ease of use, interfacing with Xbee.
Researched various makes and models of clamp-on transformer based current sensors. Narrowed down the field according to required parameters to interface with Xbee ADC pins.
Researched adaptability of current output type sensors with Xbee. compared advantages of current type vs voltage type sensors and settled on current type.
Gave final recommendation after considering ease of use, availability, price, and packaging among other electrical characteristics.