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Guest
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 Posted: Mon Aug 09, 2004 2:07 pm Post subject: How do I convert the DrDaq sensor values under Linux? |
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Hi,
I have sucesfully managed to compile the DrDaq Linux driver and can run the ddtest program. When I select option C to write continous data I get entries such as this:
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965 996 4 0 0 -47 997-32768-32768 4036 99
965 1006 12 0 0 -57 997-32768-32768 4210 99
965 1000 8 0 0 -42 997-32768-32768 4036 99
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If I select option A to show the measurements as the ADC counts rather than the measurement values then I get:
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4016 2084 12 8 4000 3320 4092 4008 3996 4004 2040
4020 2084 8 8 4008 3348 4092 4000 4000 3996 2040
4020 1992 8 8 4012 3380 4092 4004 3996 3996 2040
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I have been able to determine that the 3rd column is Sound and the 6th is Light as these values change when I make some noise or cover the light sensor. However, these values seem to be meaningless in their current form either as ADC counts or as scaled values.
Is there anyway to convert these to degrees C, dB, etc? Could you also tell which channel is connected to which sensor, as they don't seem to correspond with what is written in the DrDaq user manual (e.g. it says that light is channel)
Ultimatly I want to write my own C program to log sensor values into a database and possibly make the sensor readings available on the network. |
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Guest
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| Posted: Thu Aug 12, 2004 10:00 am Post subject: |
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Please can somebody help me? I've been pouring over the source code for a couple of days now and I still cant figure out how to get the driver to return meaningful values for the sensors.
E.g. According to the user manual the light sensors is supposed to return values between 0 and 100, but I'm getting values anywhere between -60 and 700 when ddtest is set to return measurement values and im getting values between 500 and 3000 when ddtest is set to return adc counts. |
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Guest
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| Posted: Fri Aug 13, 2004 3:22 pm Post subject: |
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I have now finally managed to convert the ADC count readings for light, sound and temperature into real meaningful values by examaning the methods from drdaqscl.c and rewritting them into my own program.
I have written a simple C program that flashes the LED and then takes 40 readings once a second from the sensors. I have made this code available at http://www.uk-dave.com/files/drdaq.c for anyone else who has been struggeling like me.
The output from my program is:
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Opening printer port 0... OK
Flashing LED... OK
Reading sensors...
Unknown Unknown Sound Unknown Unknown Light Unknown Unknown Unknown Unknown Temp
0: 4092 2064 55.00dB 8 4008 44.80 4092 4000 3996 4004 24.70C
1: 4024 2028 55.00dB 8 4008 45.20 4092 4000 3996 3996 24.70C
2: 4020 2096 55.00dB 8 4004 44.70 4092 4000 4008 4012 24.70C
3: 4024 2020 55.00dB 8 4008 44.70 4092 4012 4000 4008 24.70C
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masterman
Guest
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| Posted: Wed Mar 22, 2006 3:56 pm Post subject: woth is your linux version |
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Please , can you write a linuk version thet you use?
thanks |
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Sarah
Guest
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| Posted: Fri Mar 24, 2006 11:54 am Post subject: |
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Hi
Unfortunately we no longer actively support Linux. We have some old Linux drivers and files which can be used and we still supply these but we are unable to support them, update them or write new ones.
Best Regards |
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masterman
Guest
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| Posted: Thu Mar 30, 2006 11:32 am Post subject: |
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thanks for replay,
but what is the kernel version.
I have compailed drdaq driver (version 3000) and kernel 2.6.8.1 on debian,and function as:
- the led function fine
- the digital output function fine
- but if select C in di test file (ddtest) the output is:
-1000 550 0 0 604-32768 0-32768-32768 0 0
-1000 550 0 0 604-32768 0-32768-32768 0 0
-1000 550 0 0 604-32768 0-32768-32768 0 0
-1000 550 0 0 604-32768 0-32768-32768 0 0
-1000 550 0 0 604-32768 0-32768-32768 0 0
ALso if I switch in ADC values, the output is:
0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0
So, I request your configuration.
Thanks in advance. |
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masterman
Guest
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| Posted: Tue Apr 11, 2006 1:02 pm Post subject: please help me |
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What is the linux distribution that you hae installed????
thanks |
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Sarah
Guest
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| Posted: Tue Apr 11, 2006 2:20 pm Post subject: |
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Hi
Unfortunately we are unable to help with Linux enquiries. The examples we provide were written on RedHat (version 6 I believe) but this is all I know I'm afraid. The person who wrote them is no longer with the company so we are unable to update them or provide support for them.
Best Regards |
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