Hi libelium-dev

I read the : waspmote-technical_guide_eng.pdf, in page 56, i see the RSSI that i want be to use to measure distance between two mote, so the question is:

1/ how can i measure RSSI?
2/It is between Mote and Gateway or between Mote to Mote ?

When i read p 57, they use:



and i see also the example given : ------Waspmote XBee 802.15.4 Getting RSSI Example------


I know that i can get RSSI after receiving a packet, so i use this code between Mote and Gateway, but always it give me RSSI=0;

Please tell me what's wrong in my code and how can i do????
CODE:



Please tell me how can i do, because i have a project to do it, it is to calculate the distance between 5 mote.

Thankyou...

Regard
ghorbel

Hi libelium-Dev

Please can you tell me How can I do to get RSSI value???

Can you answer my previous question please...

Regard
ghorbel

Hi libelium-dev

Please can you answer my question in RSSI... because i'm stuck in this step.

Best Regard
Ghorbel

Hi,

When you do this: You haven't send/received any packet yet. You should do it after receiving it.
What does your Waspmote print on your serial monitor when you do this:

Bes regards!

Hi libelium-dev
Thanks for the reply

i use another code to show data and the RSSI, but i obtain a strange value...

code:


packetXBee* paq_sent;
int8_t state=0;
long previous=0;
char* data = "Mote 1 sending";
int g=0;
uint8_t PANID[2]={0x12,0x34};

void setup()
{
// Inits the XBee 802.15.4 library
xbee802.init(XBEE_802_15_4,FREQ2_4G,NORMAL);

// Powers XBee
xbee802.ON();
}

void loop()
{
// Chosing a channel : channel 0x0D
xbee802.setChannel(0x0D);
if( !xbee802.error_AT ) XBee.println("Channel set OK");
else XBee.println("Error while changing channel");

// Chosing a PANID : PANID=0x1234
xbee802.setPAN(PANID);
if( !xbee802.error_AT ) XBee.println("PANID set OK");
else XBee.println("Error while changing PANID");

// Set params to send
paq_sent=(packetXBee*) calloc(1,sizeof(packetXBee));
paq_sent->mode=BROADCAST;
paq_sent->MY_known=0;
paq_sent->packetID=0x52;
paq_sent->opt=0;
xbee802.hops=0;
// xbee802.setOriginParams(paq_sent, "0013A20040693723", MY_TYPE);
xbee802.setOriginParams(paq_sent, MY_TYPE);
xbee802.setDestinationParams(paq_sent, "0013A20040762047", data, MAC_TYPE, DATA_ABSOLUTE);
xbee802.sendXBee(paq_sent);
sprintf(data, "RSSI is : %x ","dBm\n",xbee802.getRSSI(),'\r','\n');
if( !xbee802.error_TX )
{
XBee.println("ok");
}
free(paq_sent);
paq_sent=NULL;

// Waiting the answer
previous=millis();
while( (millis()-previous) < 10000 )
{
if( XBee.available() )
{
xbee802.treatData();
if( !xbee802.error_RX )
{
// Writing the parameters of the packet received
while(xbee802.pos>0)
{
XBee.print("Network Address Source: ");
XBee.print(xbee802.packet_finished[xbee802.pos-1]->naS[0],HEX);
XBee.print(xbee802.packet_finished[xbee802.pos-1]->naS[1],HEX);
XBee.println("");
XBee.print("MAC Address Source: ");
for(int b=0;b<4;b++)
{
XBee.print(xbee802.packet_finished[xbee802.pos-1]->macSH[b],HEX);
}
for(int c=0;c<4;c++)
{
XBee.print(xbee802.packet_finished[xbee802.pos-1]->macSL[c],HEX);
}
XBee.println("");
XBee.print("Network Address Origin: ");
XBee.print(xbee802.packet_finished[xbee802.pos-1]->naO[0],HEX);
XBee.print(xbee802.packet_finished[xbee802.pos-1]->naO[1],HEX);
XBee.println("");
XBee.print("MAC Address Origin: ");
for(int d=0;d<4;d++)
{
XBee.print(xbee802.packet_finished[xbee802.pos-1]->macOH[d],HEX);
}
for(int e=0;e<4;e++)
{
XBee.print(xbee802.packet_finished[xbee802.pos-1]->macOL[e],HEX);
}
XBee.println("");
XBee.print("RSSI: ");
XBee.print(xbee802.packet_finished[xbee802.pos-1]->RSSI,HEX);
XBee.println("");
XBee.print("16B(0) or 64B(1): ");
XBee.print(xbee802.packet_finished[xbee802.pos-1]->mode,HEX);
XBee.println("");
XBee.print("Data: ");
for(int f=0;f<xbee802.packet_finished[xbee802.pos-1]->data_length;f++)
{
XBee.print(xbee802.packet_finished[xbee802.pos-1]->data[f],BYTE);
}
XBee.println("");
XBee.print("PacketID: ");
XBee.print(xbee802.packet_finished[xbee802.pos-1]->packetID,HEX);
XBee.println("");
XBee.print("Type Source ID: ");
XBee.print(xbee802.packet_finished[xbee802.pos-1]->typeSourceID,HEX);
XBee.println("");
XBee.print("Network Identifier Origin: ");
while( xbee802.packet_finished[xbee802.pos-1]->niO[g]!='#' )
{
XBee.print(xbee802.packet_finished[xbee802.pos-1]->niO[g],BYTE);
g++;
}
g=0;
XBee.println("");
free(xbee802.packet_finished[xbee802.pos-1]);
xbee802.packet_finished[xbee802.pos-1]=NULL;
xbee802.pos--;
}
previous=millis();
}
}
}

// Getting RSSI using the API function
xbee802.getRSSI();
if( !xbee802.error_AT ){
XBee.print("RSSI: ");
XBee.println(xbee802.valueRSSI[0],HEX);
}

delay(3000);
}

At the screen, i see this:
~ € }3¢ @o³cR
# Mote 1 sending~ € }3¢ @o³c#R
# RSSI is : 2740æ~ € }3¢ @o³c/R
# RSSI is : 2740Ú~ € }3¢ @o³cAR
# RSSI is : 2740È

Please what's the problem exactly????


Question: please i want to know when i want to use the RSSI, i use (1 mote+Gateway) or (2 mote+gateway)... or what can i use exactly???

have you an example that is work fine that i can use it ???

Best Regard
ghorbel

Dear ghorbel,


In your code, at line:

Your are printing RSSI as hexadecimal value. Change type choosing the best for you.


Getting the RSSI value is not mandatory. you can use it or not. Regarding your network topology, you can use all that you mention.

There is an example included in Waspmote IDE called Getting_RSSI. Try this example to see how it works.

Kind Regards.

Hi libelium -dev

Thank you for the reply...

When i use this code, i see the HEX value at the screen (the receive mote attached to the USB port) and it's ok.
XBee.print("RSSI: ");
XBee.print(xbee802.packet_finished[xbee802.pos-1]->RSSI,HEX);

But now , when i want to see the RSSI at the screen using the GateWay (Radio 802.15.4) i can't see the value... please can you tell me How can i do to resolve my problem???

Can use this:
Sprintf(data,"RSSI: ",xbee802.packet_finished[xbee802.pos-1]->RSSI,HEX); ???? to show RSSI in radio using gateway?

Best Regard
Ghorbel

ghorbel,

If you want to see the RSSi value on your gateway, first you have to send it to the gateway xbee.

As you say, you can use sprintf function to build data frame with RSSI value and later send it.

If you want to know further of the sprintf function please take a look into c++ reference here

Regards!

Hi libelium-dev
Thanks for the reply...
I got it and it's work well with Hex value... and it should be converted to the decimal.

Now i want to know can i transform this value to percent ( e.g: 88%) and print it in the screen...
there is any formula or what can i do??

Kind Regard
ghorbel

Dear ghorbel,

In this topic this issue is mentioned.

We recommend you to read Digi documentation for your xbee module and calculate your own formula to display this data in %.

Regards!