Hi Ferry,
I faced a problem similar to you this morning. Every timer fired, ı tried to
read three ADC channel. It sent only the first readings, but not the other two
channel readings. I solved it by using a integer named sequence. After the
single ADC reading, i increment it and decide whose turn it is.
if sequence % 3 == 0
read ADC1;
else if sequence % 3 ==1
read ADC2;
else if sequence % 3 ==2
read ADC3;
event void Read1.readDone()
{
getData;
sequnce ++;
}
It solved my problem. You may say that it lowers reading frequency. You are
right, but decreasing the timer interval will compensate i think.
Note: Since websense does not let, i could not see the screenshots.
Firat TARAKTAS
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ferry Cialis
Sent: Tuesday, June 05, 2007 11:46 AM
To: [email protected]
Subject: [Tinyos-help] Reducing data loss in Oscilloscope application
Hello,
I've a question about data transfer loss that I need help in. Firstly, I'm
trying to get 2 different sensor readings. The sensor readings are
Accelerometer X-direction and Accelerometer Y-direction. Previously, I managed
to get both sensor readings from 2 motes i.e. each motes has each sensor and
both transmit the sensor data to TOSBASE to be displayed over via Serial
Forwarder to Oscilloscope GUI. The link below shows a screenshot of the result:
http://i194.photobucket.com/albums/z154/ferrycia/Oscilloscope2.jpg
As seen, the green one is the Accelerometer X sensor readings in a mote in
channel 1 while the red one is Accelerometer Y in another mote in channel 2.
The result seems ok.
Next, I tried to get both of the sensor readings into a single mote to improve
efficiency. I've modified the code a bit to separate the channels. The sensor
was mounted on top of a mote and the same procedures with Serial Forwarder and
Oscilloscope were done. The link below sows the result:
http://i194.photobucket.com/albums/z154/ferrycia/Oscilloscope1.jpg
As seen, the red one which represented channel 2 had plenty of data loss and
the reading for it was patchy and intermittent but the green one for channel 1
runs as usual. Also, channel 2 readings
Is the problem lies in the loss data transfer when I tried to transmit 2 (or
more) sensor readings from the same mote ? How do I correct or optimise the
method ? Do I need to change anything for the Oscilloscope or TOSBASE code ?
Please advise me clearly in the matter as I'm quite at loss
Thank you for the attention,
yours,
Ferry
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