- Thu Feb 07, 2008 8:46 am
#42414
Hi,
I am trying to implement an indoor location detection system using RF modules. I already have Nordic nRF2401 modules. So i come up with various of algorithms based on measuring the distance between two RF modules.
So i simply try different ways to measure it but the result was not much more than being in range or not for different output powers. (there are only 4 different output power option and even the smallest output power causes too much range for me)
I found out an option for me to replace the ceramic antenna with some wire and resistors but I am not sure about the length of the wire and the resistor value.
Another option seems like using RSSI pins and measure the distance between the RF modules where my module(RF2401) does not provide any RSSI output. Maybe changing the RF module would help but not sure about which one to use.
So I am kinda stuck here. It would be great to know wheather any of these options would work or not for distance measurement.
And which module to use for RSSI measurement or how to design an antenna for a specific range.
Cheers,
Mehmet
I am trying to implement an indoor location detection system using RF modules. I already have Nordic nRF2401 modules. So i come up with various of algorithms based on measuring the distance between two RF modules.
So i simply try different ways to measure it but the result was not much more than being in range or not for different output powers. (there are only 4 different output power option and even the smallest output power causes too much range for me)
I found out an option for me to replace the ceramic antenna with some wire and resistors but I am not sure about the length of the wire and the resistor value.
Another option seems like using RSSI pins and measure the distance between the RF modules where my module(RF2401) does not provide any RSSI output. Maybe changing the RF module would help but not sure about which one to use.
So I am kinda stuck here. It would be great to know wheather any of these options would work or not for distance measurement.
And which module to use for RSSI measurement or how to design an antenna for a specific range.
Cheers,
Mehmet