Categories

• Announcements
  

  Announcements regarding our community

  5
  Topics
  13
  Posts

  M

  thank you for this thread, for the new ones, thanks a lot

• Colorimeter
  

  Forum for discussing the IO Rodeo colorimeter

  32
  Topics
  131
  Posts

  M

  sometimes a litlle thing makes the difference, thanks

• Rodeostat
  

  Forum for discussing the new open source potentiostat shield

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  Topics
  200
  Posts

  

  @acetylcholin

  I think the +/-1uA is probably pushing it. I think you would probably want something more like a +/-50 or 100nA range. It is possible to modify the Rodeostat to reduce the current range. We have made modified versions with +/-60nA and +/-100nA ragnes. There are some notes on how to do this in the "hardware/pcbs/teensy_shield/notes" sub-directory of the project repository https://bitbucket.org/iorodeo/potentiostat See the file named "nano_amp_mods.txt". We made two versions the 2nd worked best. The changes were as follows:

  R5 = 6.04 MOhm, C19 = 10nF capacitor (100nF range)
  Digikey PN: 541-6.04MCCT-ND, and 311-1136-1-ND

  R6 = 10 MOhm, C20 = 100nF (60nF range)
  Digikey PN: 541-10MAZCT-ND and Digikey 311-1361-1-ND

  There is modified firmware available for these ranges you just need to enable the CURRENT_VARIANT_NANO_AMP #define in the in ps_hardware_variant_defs.h and comment out the CURRENT_VARIANT_MICRO_AMP #define. The ps_hardware_variant_defs.h is found in the firmware/libraries/potentiostat/ sub-directory.

• Cheapstat Potentiostat
  

  Forum for discussing open source potentiostats

  31
  Topics
  106
  Posts

  M

  hi, I am new in this forum I am learning a lot, thanks

• Electrophoresis and Gel Imaging
  

  A forum for discussing our open source gel electrophoresis, transilluminators and gel imaging equipment

  28
  Topics
  65
  Posts

  

  @Rlippert

  I think darktable would be a reasonable option https://www.darktable.org/

  You can find a list of supported cameras here https://www.darktable.org/resources/camera-support/

  There is some information of camera tethering here https://www.darktable.org/usermanual/en/tethering_chapter.html

• Panels Display System
  

  Forum for questions about the Panels Display System

  2
  Topics
  9
  Posts

  A

  Oh gosh, you are right! I’m sorry for the delay but I was very busy. I have never thought to rotate the LED matrix because I thought I was right with that (otherwise, if not, no LED would have turned on). Thanks very much! I also take advantage of you for another issue. I have tried to load the arena configuration on the SD card but PControl doesn’t let me do that. Have you any suggestion? It seems that the controller doesn’t communicate to the SD nevertheless at the beginning (when the controller is switch on) PControl finds and initializes the SD card. I’m sorry because of all these questions!

• Online store and Shipping
  

  A place to ask questions about our online store, inventory and shipping

  10
  Topics
  27
  Posts

  P

  Thanks for your answer! I am not happy with it, but thank you.

• General Discussion
  

  A place to talk about whatever you want

  7
  Topics
  13
  Posts

  M

  thanks for this contacts it is important have it on sight.
  thanks

• Shields & Breakout Boards
  

  Forum for discussing the IO Rodeo colorimeter

  3
  Topics
  9
  Posts

  

  @fscker

  It looks like the RTL8195 has 3.3V IO. The potentiostat shield powers the MCP4261 with 5V. So you are connecting a 3.3V device to a 5V device - I think. I'm not sure if the IO pins on the RTL8195 are 5V tolerant, but you might want to check. Could be related to you issue.

  Note, the MCP4261's could be powered off of 3.3V. They have a pretty broad allowed input range 2.7 - 5.5V. This would require cutting one trace - the one going to the 5.5V on the shield - and rerouting this trace to to the 3.3V pin.

  The spec sheet for the MCP4261 can be found here. http://ww1.microchip.com/downloads/en/DeviceDoc/22059b.pdf