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Problems with retrieving sensor values
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ferret_guy
Rookie
Joined: Mon Oct 10, 2011 4:46 pm Posts: 15
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 Problems with retrieving sensor values
When using the following code and looking at the RobotC debug window it appears that it accepts one set of readings and then just sits with no new values  |  |  |  | Code: #pragma config(Sensor, S1, Left, sensorSONAR) #pragma config(Sensor, S2, Center, sensorSONAR) #pragma config(Sensor, S3, Right, sensorSONAR) #pragma config(Sensor, S4, Light, sensorLightInactive) //*!!Code automatically generated by 'ROBOTC' configuration wizard !!*// int L=0; int C=0; int R=0; int Lht=0; task main() { while(true) { L=SensorValue(Left); C=SensorValue(Center); R=SensorValue(Right); Lht=SensorValue(Light); ubyte valueToSend[4]; valueToSend[0] = L; valueToSend[1] = C; valueToSend[2] = R; valueToSend[3] = Lht; cCmdMessageWriteToBluetooth(valueToSend, 4,mailbox1); } }
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| Fri Jun 22, 2012 2:28 pm |
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JohnWatson
Site Admin
Joined: Thu May 24, 2012 12:15 pm Posts: 380
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 Re: Problems with retrieving sensor values
I'm looking into this right now for you, in the meantime what are you transmitting to? Another NXT brick or a different Bluetooth receiver?
_________________Check out our Blog! And our Facebook page! Need help? Take a look at our Wiki and our Forums.I just met you, And this is crazy, But here's my code now, So fix it, maybe? ~ Carly Rae Jepsen parody
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| Fri Jun 22, 2012 3:36 pm |
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mightor
Moderator
Joined: Wed Mar 05, 2008 8:14 am Posts: 2859 Location: Rotterdam, The Netherlands
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 Re: Problems with retrieving sensor values
Well, for one, it's SensorValue[<port>], not (), so you might want to fix that part first.
- Xander
_________________| Some people, when confronted with a problem, think, "I know, I'll use threads," | and then two they hav erpoblesms. (@nedbat)| My Blog: I'd Rather Be Building Robots| ROBOTC 3rd Party Driver Suite: [ Project Page]
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| Fri Jun 22, 2012 5:00 pm |
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ferret_guy
Rookie
Joined: Mon Oct 10, 2011 4:46 pm Posts: 15
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 Re: Problems with retrieving sensor values
Just fixed the brackets thanks, I had a brain fart and its still doing it. I am using this to stream sensor data to another NXT.
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| Sun Jun 24, 2012 10:40 pm |
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Spiked3
Expert
Joined: Tue Feb 28, 2012 3:10 pm Posts: 195
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 Re: Problems with retrieving sensor values
Using bluetooth has been incredibly frustrating. I have no idea how much of it is NXT v. just plain Bluetooth issues, but I manage to lock up my PC, and/or the NXT at a rate of about 65 times per hour. Anyhow, here is what I am using currently, which minumizes the lockups to only 65 an hour;  |  |  |  | Code: task BroadcastPose() { nSchedulePriority = 5; // lower than 'default' ubyte xmitBuff[12]; while (true) { // live data logging int x; memcpy(xmitBuff[0], "PO", 2); x = time1[T1]; memcpy(xmitBuff[2], x, 2); x = nMotorEncoder[LEFT]; memcpy(xmitBuff[4], x, 2); x = nMotorEncoder[RIGHT]; memcpy(xmitBuff[6], x, 2); x = HTMCreadHeading(COMPASS); memcpy(xmitBuff[8], x, 2); x = 0; memcpy(xmitBuff[10], x, 2); // reserved for IMU heading while (bBTBusy) wait1Msec(10); //??cCmdMessageAddToQueue(0, xmitBuff, sizeof(xmitBuff)); cCmdMessageWriteToBluetooth(xmitBuff, sizeof(xmitBuff), mailbox1); while (nBluetoothCmdStatus == ioRsltCommPending) wait1Msec(2);
wait1Msec(1000); } } |  |  |  |  |
Notice a few waits in there. I can tell you the switch from transmit to receive is a huge hit, and so you are much better off ONLY doing one way communications which this is not. Even though you are only sending data, the NXT waits for a readMail request, before it sends. That is a transition. I'm currently re-implementing it using raw blueTooth, and one way only.
_________________Mike aka Spiked3 http://www.spiked3.com
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| Mon Jun 25, 2012 2:34 am |
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