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i am taking values from an electrical circuit.
Hi,
Not sure if I understand your question. You need sensors on your RaspberryPi to record/store data information. You RaspberryPi is just a board on which you put sensors that can record/store some values. For example, when you say you are retrieving some temperature and humidity values from a RaspberryPi you are actually retrieving values(data information) from a sensor(for example AM2302) on that RaspberryPi.
Tell me more about your project or what is it that you are trying to achieve.
Hope this helps,
Adrian