FeAtHEr-Cm meets Star Wars

I have this little Star Wars lunch box, and just noticed that it is big enough to fit the Adafruit Feather along with my potentiostat featherwing. What does that mean? I have the most awesome Faraday cage!

Mini metal Star Wars lunch box hanging out with the bob173 potentiostat.
And voila! A Faraday cage… if I’m willing to drill holes in the case.

FeAtHEr-Cm in action – 1

We are several weeks into the semester, and my Instrumental Approach to Chemical Analysis students are knee deep in learning about instrument design and preparing their own potentiostats. None of my students had soldered before, and Jarrod gave me permission to share his performance with the world (so long as I mentioned that he’s wearing his Department of ENVIRONMENTAL science shirt to show off his true colors).

And here’s his completed bob173-gamma potentiostat.

FeAtHEr-Cm gamma tests

I received the PCBs for the gamma (3rd) version of the FeAtHEr-Cm potentiostat. I really like how this one comes together. Complete with 2 20kohm pots for adjusting virtual ground and iR compensation plus the passives all fit in a single 14-pin socket which allows students to explore how changing these components can influence the performance of the instrument (and to hack it to do things it’s not intended to do). Plus, it’s got buttons! This is the version that students will see this fall.

The bob173-gamma potentiostat.

FeAtHEr-Cm update

Previously, I announced my latest project in The start of FeAtHEr-Cm. Over the past several weeks, I’ve been iterating through the potentiostat design and I think I’m at a point that the design will stay more or less in place, allowing me to shift my focus to documentation, instrument use and lesson plans.

I’ve also spent some time building a website that contains the documentation for building the instrument, writing code and using the potentiostat in an educational setting. Rather than re-write all of that information here, head on over to this page for a summary of what’s been done and what’s in the pipeline.

Example CVs from 0.01 to 0.5 V/s of potassium ferrocyanide in 0.1 M KCl at a 2 mm diameter Pt electrode. Obtained using the gamma version of the bob173 potentiostat.