I want to calculate the RSSI value of a Bluetooth module (HC05) and from the derived RSSI value I want to calculate the distance of the surrounding devices. I'm using an Arduino Uno r3 as a controller and the Arduino IDE as a programmer.
Actually I have done the RSSI calculations with a NodeMCU device, but there also I can't convert it into a distance in meters. Please let me know the solution of this problem. The reason why I downgraded to Bluetooth from Wifi is the battery Capacity.
Also let me know about operating voltage levels of WiFi and Bluetooth and which one has better efficiency and power consumption.