I would like to know if it is possible to connect an RF(radio frequency) module to my smartphone and find the distance between them with an accuracy of about +/-2 meters. To find distance I believe I have to use RSSI level (Received signal strength indication). I have considered using bluetooth but I would like to find better alternatives because I need more range than bluetooth can provide. I need to measure distances up to 100m/300 feet. I found some module from ebay that transmits 433MHz. Is it possible? Thank you.
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