Or, apparently, fortnightly. Sure I’ve been doing stuff, too much stuff to be writing updates 🙂
Monday the 14th, cleaning the basement. Not very exciting in itself, but we’ll get to that…
Tuesday the 15th – more laser cutting! Discovered that if you’re doing two separate runs of the same thing, you really need to watch the scaling factor. So now I have to clumsily file down the slots in front of the pi cluster enclosure 🙂 And the fan mount on top has worked nicely.
Wednesday the 16th
So, why did I clean up the basement?
Rejigging the EMG sensors. Apparently, I had the signal wire going to the wrong pin of the final IC. Oh well. On the bright side, DirtyPCB are cheap and fast. So the new version should be here in, now, a week.
Having discovered Benjamin Vedder’s open source ESC ( http://vedder.se/2015/01/vesc-open-source-esc/ ), I’ve decided to build a couple over the summer. I ordered parts a while back, and after exams I finally have enough time to build it. So I wandered into the TAFE side of school to borrow a reflow oven from the techs. I’ve done a number of fiddly things in my time, but this was by far the fiddliest. Tiny things everywhere. This was my first time with reflow, and first time with stencils for the paste. Again, fiddly, but once the stencil is centred, so much less fiddly than other methods. I will get metal stencils next time, I think, but the mylar was ok for this job.
All present and correct on side 1. Didn’t get around to side 2 on Monday, but I did arrange a lot of tiny resistors.
On Monday, this was the fiddliest thing I had ever done:
That record lasted 2 whole days:
This is Benjamin Vedder’s ESC – http://vedder.se/2015/01/vesc-open-source-esc/. I haven’t programmed the STM yet, but I powered it up, and a little blue light came on and nothing caught fire. Sounds like a win!