When HN users recommended it
1 HN user recommended this in 2014, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
1 HN user recommended this in 2014, in one comment.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
I've always preferred the compressed air approach, but mostly because of cost - those peristaltic pumps are pretty pricy if you want to get 12ish bottles in there. I was under the impression that you could use relatively cheap pneumatic solenoids like this http://www.amazon.com/Vdc-Normally-Closed-Solenoid-Valve/dp/... at ~$5 rather than ~$14. Do you think that it's important to get high quality valves? My plan was to use a scale and do some feedback control to compensate.