Comments for Cerulean http://cerulean.dk/words The article and blog words of Christian Liljedahl Thu, 02 Sep 2010 23:26:57 +0200 http://wordpress.org/?v=2.8.6 hourly 1 Comment on Arduino and Load cell by chrlilje http://cerulean.dk/words/?page_id=42&cpage=1#comment-3614 chrlilje Thu, 02 Sep 2010 23:26:57 +0000 http://cerulean.dk/words/?page_id=42#comment-3614 Did you make your load cell yourself, using strain gauges? In that case, if you have a half-bridge configuration, you will get drifting values due to temperature changes. This can also be the case, if you are running long wires to your load cell, I think. I have always made my designs able to auto calibrate every now and then. Good luck! :-) Christian Did you make your load cell yourself, using strain gauges?

In that case, if you have a half-bridge configuration, you will get drifting values due to temperature changes.

This can also be the case, if you are running long wires to your load cell, I think.

I have always made my designs able to auto calibrate every now and then.

Good luck! :-)
Christian

]]> Comment on Arduino and Load cell by martin http://cerulean.dk/words/?page_id=42&cpage=1#comment-3605 martin Thu, 02 Sep 2010 11:29:37 +0000 http://cerulean.dk/words/?page_id=42#comment-3605 Thanks for the advice. I got the load cell to work properly finally. The problem was bad soldering. Right now I am running an arduino and processing visual graphing program to visualize deflections. My new problem is that the reading from the INA125P drifts. I cannot get a fixed value as a basis or zero line since it keeps on drifting. Any guess / tip regarding this? Thanks for the advice.
I got the load cell to work properly finally.
The problem was bad soldering.
Right now I am running an arduino and processing visual graphing program to visualize deflections.
My new problem is that the reading from the INA125P drifts.
I cannot get a fixed value as a basis or zero line since it keeps on drifting.
Any guess / tip regarding this?

]]> Comment on Arduino and Load cell by chrlilje http://cerulean.dk/words/?page_id=42&cpage=1#comment-3575 chrlilje Tue, 31 Aug 2010 16:12:56 +0000 http://cerulean.dk/words/?page_id=42#comment-3575 Hi vito Sorry for not posting the code yet. It was developed on an old computer, and I havn't dug the code up from it yet. I hope you can make your deadline - It is quite simple - Read an analog value, and change it to a corresponding kilogram value. It is linear, so its a basic linear function. kind regards Christian Hi vito

Sorry for not posting the code yet. It was developed on an old computer, and I havn’t dug the code up from it yet.
I hope you can make your deadline – It is quite simple – Read an analog value, and change it to a corresponding kilogram value. It is linear, so its a basic linear function.

kind regards
Christian

]]> Comment on Arduino and Load cell by chrlilje http://cerulean.dk/words/?page_id=42&cpage=1#comment-3574 chrlilje Tue, 31 Aug 2010 16:11:05 +0000 http://cerulean.dk/words/?page_id=42#comment-3574 Hi - Regarding sensitivity, then I could get about 0.1 kg sensitivity from a 1700 kilo load cell. This I did using about 6000 times of amplification with the resistor. If you don't see any deflection, then it is off somehow. It is very visible, when it is visible. Did you build your load cell yourself? Sometime the cell is skewd, and you need to add a resistor to correct it. You should be able to see a milivolt change on a normal multimeter, even without the amplification of the INA125. My best bet is, that you have connected the wires wrongly. The color codes are completely different from manufacturer to manufacturer. Hope you get it working! kind regards C Hi – Regarding sensitivity, then I could get about 0.1 kg sensitivity from a 1700 kilo load cell.
This I did using about 6000 times of amplification with the resistor.

If you don’t see any deflection, then it is off somehow. It is very visible, when it is visible.

Did you build your load cell yourself? Sometime the cell is skewd, and you need to add a resistor to correct it.

You should be able to see a milivolt change on a normal multimeter, even without the amplification of the INA125. My best bet is, that you have connected the wires wrongly. The color codes are completely different from manufacturer to manufacturer.

Hope you get it working!
kind regards
C

]]> Comment on k8055 control from php in Linux by Henrik http://cerulean.dk/words/?page_id=32&cpage=1#comment-3571 Henrik Tue, 31 Aug 2010 14:50:07 +0000 http://cerulean.dk/words/?page_id=32#comment-3571 I just want to say that adding the k8055 executable to the /etc/sudoers file was my solution of the problem of accessing the usb from the PHP file. I think this is quite a "safe" option. I did this on my Netgear ReadyNas. I just want to say that adding the k8055 executable to the /etc/sudoers file was my solution of the problem of accessing the usb from the PHP file.
I think this is quite a “safe” option.
I did this on my Netgear ReadyNas.

]]> Comment on Arduino and Load cell by martin http://cerulean.dk/words/?page_id=42&cpage=1#comment-3544 martin Mon, 30 Aug 2010 07:26:04 +0000 http://cerulean.dk/words/?page_id=42#comment-3544 Hi, Good day. I am trying to use your setup with the load cell for my thrust stand setup. My load cell is a 40 kg one with 5 pins: red, black, black, green and white. I connected the pins while coupling the two black ones similar to your circuit. Apparently, I have not seen much deflection from the INA125P Vout reading. Can you give me a typical reading from your setup. I have been literally standing on it while the load cell is on the edge of a wooden table and I can't see deflections. I hope you can help me. Thanks, Martin Hi,

Good day.
I am trying to use your setup with the load cell for my thrust stand setup.
My load cell is a 40 kg one with 5 pins: red, black, black, green and white.
I connected the pins while coupling the two black ones similar to your circuit.
Apparently, I have not seen much deflection from the INA125P Vout reading.
Can you give me a typical reading from your setup.
I have been literally standing on it while the load cell is on the edge of a wooden table and I can’t see deflections.
I hope you can help me.

Thanks,

Martin

]]> Comment on Arduino and Load cell by vito http://cerulean.dk/words/?page_id=42&cpage=1#comment-3391 vito Tue, 24 Aug 2010 12:46:02 +0000 http://cerulean.dk/words/?page_id=42#comment-3391 Hy I am working on the exact same project in scholl and would love it if you`d post the code... I tryed doing some work on the code, but I do not have an arduino kit yet, and my deadline is coming up... Would be very grateful for the code. thank you Hy I am working on the exact same project in scholl and would love it if you`d post the code…
I tryed doing some work on the code, but I do not have an arduino kit yet, and my deadline is coming up…
Would be very grateful for the code.

thank you

]]> Comment on k8055 control from php in Linux by Duane http://cerulean.dk/words/?page_id=32&cpage=1#comment-1484 Duane Sun, 13 Jun 2010 16:38:14 +0000 http://cerulean.dk/words/?page_id=32#comment-1484 Thank you jotape99. Changing the group to plugdev in the rules file corrected my problem. Thank you jotape99. Changing the group to plugdev in the rules file corrected my problem.

]]> Comment on k8055 control from php in Linux by Duane http://cerulean.dk/words/?page_id=32&cpage=1#comment-1460 Duane Sat, 12 Jun 2010 14:46:55 +0000 http://cerulean.dk/words/?page_id=32#comment-1460 I have a Ubuntu 10.04 system. I have the LIBK8055 library installed. The K8055 board working well from the command line and a script file. Permissions are open for the world. However, when I attempt to run it from a php script it cannot open the k8055 port. Any ideas? Duane I have a Ubuntu 10.04 system. I have the LIBK8055 library installed. The K8055 board working well from the command line and a script file. Permissions are open for the world. However, when I attempt to run it from a php script it cannot open the k8055 port. Any ideas?

Duane

]]> Comment on Speaking to Processing from Google talk or Jabber by Sonny W http://cerulean.dk/words/?page_id=91&cpage=1#comment-787 Sonny W Wed, 07 Apr 2010 08:26:18 +0000 http://cerulean.dk/words/?page_id=91#comment-787 NICE WORK! Now we only need a similar XMPP glue component for the web app end and we can have a nice and relaxed conversation with Processing through a web I/F :-) NICE WORK!

Now we only need a similar XMPP glue component for the web app end and we can have a nice and relaxed conversation with Processing through a web I/F :-)

]]>