Jee Labs Talk

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1. kafka82
   

   Hi All,

   I am building a small network of 5 nodes + 1 central node. Each node has a temp+humidity sensor and an RGB Led on it.

   I'd like to make these node a bit responsive in this way:

   1) map the temp/humidity range with different led color (easy) 2) make a routine that every 1 minute check for which node has the highest temperature value. Then once the "winning" node is identified turn the LED on this node to a specific color while change all other LEDs on the others nodes to another color.

   So what is the best to do this? Should I compare all data sent to the central node every minute and then send back a message from the receiver to the target nodes? Or is it better that each nodes listen to all others and every minute check if its value is smaller/bigger then its neighbours?

   At moment I am not concerned with power consuption because I am planning to make a small demo and this prototype network won't run for long time (a couple of hours).

   How would you structure the code for this problem?

   Posted 06/03/2011 21:41:46

2. kafka82
   

   I have 5 of these nodes and now I want them to catch each other data and compare it every 1 minute to see which one has highest temperature/humidity.

   How do you approach this? The first thing that comes to my mind is somehting like

       if (rf12recvDone() && rcf12crc ==0 && rf12len == sizeof (Payload)) {
           measurement = (Payload) rf12data;

       if ( temp>measurement.temp2 && temp>measurement.temp3 && temp>measurement.temp4 && temp>measurement.temp5) do something
        else    do something else
       }

   this is too simple I know - first I want to execute this routine only every 1-2 minutes so prabably I will use milliseconds to enter it. Then every time this happens I will have receive 4 values from other nodes. How do I identify them?

   ok this is the code I am actually sending from a jeenode to a jeelink.

        SENDER
       ------------------------------
       typedef struct{
         float temp ;
         float hum  ;
         byte myid;
      } 
       Payload;

       Payload measurement;

        {    
              measurement.myid = rf12config();
              measurement.temp =  myDHT22.getTemperatureC();
              measurement.hum = myDHT22.getHumidity();
             rf12easySend( &measurement, sizeof measurement);

         }
       ----------------------------
   
   
   

   Posted 10/03/2011 16:09:41

3. jcw
   

   If all the nodes use broadcasts (as with rf12easySend), then rf12header contains the node ID of the sender in bits 0..4, i.e. hisnode = rf12hdr & 0x1F.

   Posted 10/03/2011 16:47:35

4. kafka82
   

   sorry I dont fully understand. Are you saying that I can access a payload id individually with a function?

   Posted 10/03/2011 17:02:06

5. kafka82
   

   I mean...I am already broadcasting each node id with measurement.myid = rf12config(); The problem is I find tricky to go thgough incoming data from n sensors and compare them.

   Posted 10/03/2011 17:35:24