@cylsky

Yes, the current is measured as the test is run. The figure is showing the applied potential in order to illustrate the various test parameters e.g. quietTime, duration, etc.

The worked example in the link below shows a plot of the current vs time when using the constant voltage test and a dummy cell.
http://stuff.iorodeo.com/docs/potentiostat/examples.html#constant-voltage-voltammetry

@PJS

On the cheapstat there aren't reallly any spare digital IOs which are conveniently available on a header or any thing like that. There are spare digital IOs on the ATXMega, e.g. PB0, PB1, PC0, PC1, etc., but the trick would be accessing them. You would have to solder a to the microcontroller pin/pad. Another option might be to the IO lines used for the SPI signals to IC4. This is a flash memory which isn't used by the current firmware. You could remove this chip and you would have four IO lines available at IC4 - CS (PD4), SI (PD5), SO (PD6) and SCK (PD7). Again you would have to solder to the pads - a pain, but at IC4 they are a bit bigger at least.

Another option might be the Rodeostat which has 2 expansions headers P13 and P14. Between them you have 16 digital IO lines you could use plus SPI and i2c bues. Both P13 and P14 use 5x2 shrouded headers which you can connect to with a standard IDC connector.

@amgomezma

Unfortunately, it isn't possible to do a true linear ramp with the Rodeostat. It uses a Digital to Analog Converter (DAC) to set the analog output value and so the output will always be in discrete steps where the minimum possible step value set by the resolution of the DAC.

Ok, I realised this morning that I need both the flash and EEPROM files loaded on the apparatus. Yep, I'm a beginner in AVR
Also, I found that the initialisation of the different profiles on the EEPROM are in comment in the source file CheapStat_v2.c (from line 260). That's why no profiles appear in the main menu. So if you want to rebuild a flash and eeprom file, you need to remove the comments from this section.
When I'll finally understand all of this, I'll post my code. I'm trying to implement ASV.

Hi Adrian,
The gel trays are plain acrylic, not solacryl (i.e. not UV transmissive). So they cannot be placed on a transilluminator. You would need to take the gel out of the tray and place it onto the transilluminator. The combs are Teflon.
Let me know if you have any follow-up questions.
Thanks !
Jo

Hi Adrian,
We have two wire options for the electrophoresis box. You can choose either stainless steel or platinum wire (+$40).
The platinum wire is a round soft wire 0.01" diameter.
Hope that helps,
Jo