Hey everyone, thanks for coming back to Wi Fi fundamentals with location and analytics. This course will help you to muster the air. we're advancing and up until now hopefully you understand what are suicides and what is the inverse square law. We will look at RSI ranging done in your home are assigned measurement can be done manually or automatically. We can measure and create a fingerprint of the area or get real time results. And based on the free space path loss and the inverse square law, determine the distance that's you by the way.
One of the ranges app you can think of is space utilization. space utilization can be used by comparing the rssi values and timestamps of the people occupying the room or the house. are assigned distance measurement can be done through a simple site survey carried by professional or even your Android phone. The walls in your house actually helps us to block RF from getting outside the room. Once planned right, knowing the rssi threshold in the edges of the house room, we can tell if our house is occupied or empty. As people enter the house, there are assigned values and time spent are taken.
Let's see how it looks in Google Sheets. In Google Sheets, I have a table that includes six columns. The first one is my access point that I positioned at home. The second one is the time. The third one is the MAC address, the MAC address of the smartphones, that or laptops or just about any device that might access points senses. The fourth column is rssi in dBm.
Let's keep that column It is used just for the function purposes. And then I had the function which is called home or away. The function says that if rssi value is equal or greater than 45, in negative dBm values, then the person holding that device is that Home, otherwise, it is a way. So we can see that we have two devices that are at home and two other devices that are away from home. measurement of the earth suicide values is done multiple times to eliminate errors. Using more than one access point we can use our society even for position.
Our society distance measurement will change dramatically according to frequency antennas gain, polarization and environment interferences. Next up we will look at the rssi equation as simple equations that will help you to measure distances. See you soon