@bucoloco

Yes, you can connect the +/-15V on the rodeostat to the +/-12V on the multiplexer.

Earlier revisions of the Rodeostat used a +/-15V DC-DC converter to provide the power rails for the op amps on the Rodeostat. Whereas, more recent revisions us a +/-12V DC-DC converter. The multiplexer is labeled to match the more recent versions of the Rodeostat. However, the multiplexer will operate fine on +/-15V.

Ah ha. I found a multiplexer example in the bitbucket code.

https://bitbucket.org/iorodeo/potentiostat/src/default/software/python/potentiostat/examples/run_mux_cyclic_w_plot.py

This answers my question. It's all in the standard firmware and the python functions are there.

Thanks

@Will-Dickson
Hi Dickson, I am also interested in the Increasing current ranges. Please tell me how to swap out R8 ? I found the R8 resistor has been fixed in the board. Would I add another external trans impedance amplifier feed back path to increase the current range ?

@Will-Dickson, thank you! It works for me on my Windows 10 machine!

I did have some initial connectivity issues, and because my Arduino IDE was old, I uninstalled and reinstalled the latest version of the Arduino IDE to get the latest Windows drivers. The connectivity issues disappeared after that and a reboot.

It even looks looks like you fixed the units issue mentioned in http://forum.iorodeo.com/topic/421/the-colorimeter-app-v4-is-stuck-on-um-but-the-values-returned-look-like-ppm! Thanks.

I'll be happy to provide bug reports for me and the people I'm working with.

I'm also looking forward to having a new v0.6 installer for MacOS, but I appreciate that you prioritized the more pressing Windows issues first.

@UviniDeSilva

No +/- 0.00009uA (90 picoamps) is too low for the Rodeostat to measure.

I've put a new version (0.6) of the colorimeter software up on the download site here https://bitbucket.org/iorodeo/colorimeter/downloads/colorimeter-v06.exe

This is an upgrade of the software from Python2 to Python3 and from PyQt4 to PyQt5. It was a pretty big upgrade and there could still be some bugs lurking. If you run into any let me know and I will try to deal with them as quickly as possible. However, supporting the Python2/PyQt4 version of the colorimeter software was starting to get to be too difficult so I really needed to upgrade.

I bundled the python software into a single executable using pyinstaller. The final executable came out kind of large (200MB) which results in a bit of a slow application launch. I'll see if I can reduce the size in the future, but I didn't want this to stand in the way of getting you something to work with.

--Will

I've put a new version (0.6) of the colorimeter software up on the download site here https://bitbucket.org/iorodeo/colorimeter/downloads/colorimeter-v06.exe

This is an upgrade of the software from Python2 to Python3 and from PyQt4 to PyQt5. It was a pretty big upgrade and there could still be some bugs lurking. If you run into any let me know and I will try to deal with them as quickly as possible. However, supporting the Python2/PyQt4 version of the colorimeter software was starting to get to be too difficult so I really needed to upgrade.

I bundled the python software into a single executable using pyinstaller. The final executable came out kind of large (200MB) which results in a bit of a slow application launch. I'll see if I can reduce the size in the future, but I didn't want this to stand in the way of getting you something to work with.

--Will

@horseflesh @CaseyWagner

I've put a new version (0.6) of the colorimeter software up on the download site here https://bitbucket.org/iorodeo/colorimeter/downloads/colorimeter-v06.exe

This is an upgrade of the software from Python2 to Python3 and from PyQt4 to PyQt5. It was a pretty big upgrade and there could still be some bugs lurking. If you run into any let me know and I will try to deal with them as quickly as possible. However, supporting the Python2/PyQt4 version of the colorimeter software was starting to get to be too difficult so I really needed to upgrade.

I bundled the python software into a single executable using pyinstaller. The final executable came out kind of large (200MB) which results in a bit of a slow application launch. I'll see if I can reduce the size in the future, but I didn't want this to stand in the way of getting you something to work with.

--Will

@aufdenkampe @wiroon @Peteea6 @aufdenkampe

I've put a new version (0.6) of the colorimeter software up on the download site here https://bitbucket.org/iorodeo/colorimeter/downloads/colorimeter-v06.exe

This is an upgrade of the software from Python2 to Python3 and from PyQt4 to PyQt5. It was a pretty big upgrade and there could still be some bugs lurking. If you run into any let me know and I will try to deal with them as quickly as possible. However, supporting the Python2/PyQt4 version of the colorimeter software was starting to get to be too difficult so I really needed to upgrade.

I bundled the python software into a single executable using pyinstaller. The final executable came out kind of large (200MB) which results in a bit of a slow application launch. I'll see if I can reduce the size in the future, but I didn't want this to stand in the way of getting you something to work with.

--Will

I will reply myself...

I had to install the FT232R USB UART Driver. Then a USB Serial Converter was installed and the port COM3 was installed after updating the driver

Now, selecting the COM3 port, it works perfectly.

Hope it can be useful for other Cheapstat users

Best regards

@Will-Dickson using the following code:

from serial import Serial
from potentiostat import Potentiostat

pstat = Potentiostat('COM8')

dev = Potentiostat('COM8')
dev.set_curr_range('100uA')
dev.set_sample_period(10)

name = 'cyclic'
param = {
'quietValue' : 0.0,
'quietTime' : 1000,
'amplitude' : 2.0,
'offset' : 0.0,
'period' : 1000,
'numCycles' : 5,
'shift' : 0.0
}
dev.set_param(name,param)
t,volt,curr = dev.run_test(name,display ='pbar')

@MartijnE

I can't really help with the arsenic measurement, but I can help you create a Python program for your tests. Could you provide some details regarding the tests you want to perform ?

@LarryD

The get_volt() method returns the current output voltage setting i.e., the value set by the user (perhaps with the set_volt method) for the voltage between the working and reference electrode. Whereas the get_ref_volt() method returns a measurement of the voltage between the working and reference electrode. There is no method to get the voltage between the working electrode and counter electrode.

@scotty

We do not have a DPV test implemented for the Rodeostat yet. This is something we are planning to add in the future. However, there isn't a specific timeline I can give you for adding this test.

Best,
Will

@gbathree

Hi Greg,

I looks like the access permissions had be set to private. I've change it to public. You should be able to download the file now. You can also access the repository here https://bitbucket.org/iorodeo/ph_meter_firmware

--Will