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|Author||Topic:10HS Data Format||2601 Views|
10 March 2011 at 10:54pm
Hi, I am writing my own data logger with 10HS.
But I cannot comprehend data received from 10HS.
Example: 00 00 00 00 69 00 AE 01 12 01 00 0D
I have been searching thru the web to get the data defination, but cannot find.
Do you have any reference on the data format?
Have do I know that the data corrected is correct? What is CRC?
12 March 2011 at 9:14am
Any way that you could post a picture of how you have the sensor hooked up? The type of output coming out of the 10HS is just a raw voltage output, which is then plugged into a calibration equation to get volumetric water content (we use the Topp equation for most soils). Here's the general process:
1. The 10HS requires a data logger with a power source, a ground, and another port that can read a voltage output.
2. The white cable is your "power" cable, the red cable is your "output" cable, and the bare cable is your ground cable. All three cables must be connected to the appropriate ports for the sensor to function.
3. Power the white cable with a voltage between 3VDC and 15 VDC (with about 12-15 mA).
4. After at least 10 mS (with the sensor still powered), take a reading from the red cable. This will be a voltage between 300-1250 mV.
5. You can power down after you take a reading.
6. If you're using a mineral soil, you can plug this voltage output into this
equation to get volumetric water content.
VWC (m3/m3) = 2.97 X 10-9 * mV3 – 7.37 X 10-6 * mV2 + 6.69 X 10-3 * mV – 1.92
I hope that this is helpful! If not, feel free to post the specs of your data logger and we'll go from there. The 10HS is a good sensor for both non-Decagon and Decagon data loggers and we've got experience integrating it into a good few.
13 March 2011 at 7:38pm
We build an extended board to work with Decagon 5TE and 10HS.
We got 5TE data working and manage to understand the data format from 5TE-5TM-integrators-guide.pdf.
In the extended board, we connect a 9v battery for the excitation purposes.
As the logic goes, it will excite the 5TE and we manage to get the data. Then it will continue for 10HS.
As we do not have any reference, we are unsure of the data.
Do you have any document like 5TE-5TM-integrators-guide.pdf for 10HS?
Later we may need to extend the integration to MPS-1.
As long as we can ensure the data integrity, we can apply the formula.
Here is the link to the extended board: http://img189.imageshack.us/i/dsc00563h.jpg/
14 March 2011 at 12:13pm
That design sounds fine. I could not see the image, however. You can power the 10HS with 9 V, but not the MPS-1 (it has a maximum of 5V excitation). The 10HS has an analog output and must be read in a different port than the 5TE sensor; specifically, a port that can read an analog, or voltage output. The 10HS manual goes into detail about integrating this sensor with a non-Decagon data logger. You'll want to look on page 8 to get details similar to the 5TE integrators guide. The 5TE is much more complex, which is why we wrote a separate integrator's guide. The manual can be found here. http://www.decagon.com/education/10hs-manual/
Feel free to post your voltage output measurements and I can help you interpret them.
14 March 2011 at 7:27pm
For MPS-1, we understand the 5V excitation. We are reconsider on the board design.
We build the board to support both 5TE and 10HS. 5TE using UART, 10HS using ADC.
We looked into the manuals before we built the board.
Now we are in the state of explaining the 10HS data.
Here are the samples collected from 10HS:
Data reading on air: 00 00 00 00 A0 00 7B 00 9F 00 00 0D
00 00 00 00 9F 00 7B 00 9F 00 00 0D
00 00 00 00 9E 00 7A 00 A0 00 00 0D
00 00 00 00 9F 00 7B 00 A0 00 00 0D
Data reading in pipe water: 00 00 00 00 A0 00 7B 00 9F 00 00 0D
00 00 00 00 9F 00 7B 00 9F 00 00 0D
00 00 00 00 9F 00 7B 00 9E 00 00 0D
00 00 00 00 9F 00 7C 00 A0 00 00 0D
In 5TE reading, it show a big different on data on air and in pipe water. With the formula, we know that our data is quite alright.
For 10HS, data on air and pipe water, they are not much different. So, we unsure that is it cause by hardware or firmware.
We are using crossbow iris for communication.
Hope you can help us on the data interpretation.
15 March 2011 at 9:06am Last edited: 15 March 2011 10:34am
Can you just send me the raw voltage values from the 10HS? These should be between 300-1250 mV. I am not sure how you are getting the letters in the data. I talked to our engineers about the data that you are seeing. What is the model number of the chip that you are using to read the 10HS? Do you have access to a multimeter that you can use and touch the output wire during a reading to get just a raw voltage?
17 March 2011 at 4:02pm Last edited: 17 March 2011 4:03pm
Are you looking for a serial string from the 10HS similar to the 5TE? It's output is fundamentally different than the 5TE in that there is no serial data. If you have the 10HS hooked up to a battery, you can actually read it with just a voltmeter. You should receive a mV output in the range of 300 to 1200 mV as Lauren mentioned.
31 March 2011 at 3:40am
Yes, I am looking for a serial string from 10HS similar to 5TE.
Now, I have been closely with firmware engineer on getting the raw data (voltage) from 10HS.
We are closing to get the proper data.
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