nrf52840 RSSI Demo

[mercimek]

Hello,
I have three nrf52840 development boards and one pcb that I made myself using nrf52840. I want to find the location of my pcb with a demo using these development boards. I put the code peripheral -> beacon to my pcb and central -> uart code to the development boards. I am using SDKv15.0.0. I should be able to know in which room my pcb is or its distance by measuring the rssi value according to the codes, but I cannot perform this demo.
Have you done a similar study on this subject before? If you did, I couldn't find a video similar to this demo, can you share it? Can you help me with what codes I can use?
thank you

[Andreas]

Hi,

 

You should note that using RSSI is inaccurate because the signal propagation and attenuation in buildings is complex and unpredictable. It is hard to get any more accurate estimates than being able to say if the device is close or far away, not in which room it is.

You could take a look at the proximity example: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/ble_sdk_app_proximity.html?cp=7_5_3_4_1_2_21

 

Best regards,
Andreas

[mercimek]

477/5000

Thank you Andreas,

I downloaded the code you shared to my development boards and my pcb. I also saw that my pcb can be programmed this way, which is pretty good. But what I want to do is a little different than that. Can I make the development boards see the RSSI value of my pcb without a phone or computer interface in between? For example, can I read the RSSI value of my pcb from the development boards, and access it with a computer terminal? 

[Andreas]

Hi,

 

We do not have any example that does exactly this, it is possible but you need to do some customization yourself.

 

You can have a look at sd_ble_gap_rssi_get(), using this you should be able to get the RSSI from the received packet. This data will be available for you to do with as you please, e.g. if you have a nRF52 device connected to a computer you can send it to a terminal, and if it is collected by a battery operated device it can be transmitted over BLE (to the device that is connected to the computer) and displayed in a terminal. BLE App UART might be a good starting point for this.

 

Best regards,
Andreas

[mercimek]

Thank you, I'm trying to figure out the codes. 

I have another question, is there a sniffer application to see the bytes? 

[Andreas]

Hi,

 

We have a sniffer, yes. See this: https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE

 

Best regards,
Andreas