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eigenrobot's profile
eigenrobot
eigenrobot
eigenrobot
@eigenrobot

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eigenrobot

@eigenrobot

robot. friend.

eigenrobot.substack.com
Joined July 2013

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    1. foone‏ @Foone 8 Aug 2020

      So, how this thing works: It's pretty interesting! It's primarily moving a plunger, here. It goes up and down, producing suction or pressure inside that little tube.pic.twitter.com/ySmel1femL

      2 replies 2 retweets 32 likes
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    2. foone‏ @Foone 8 Aug 2020

      But how do you do automated pipetting with only a single-ended plunger? Simple! That's not the only motor. There's a very accurate servo motor behind here, which rotates an internal piece:pic.twitter.com/GhmLYjH5QH

      1 reply 0 retweets 31 likes
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    3. foone‏ @Foone 8 Aug 2020

      And then you can get that distribution valve in all sorts of different designs.pic.twitter.com/SjQtrRNIh6

      3 replies 1 retweet 34 likes
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    4. foone‏ @Foone 8 Aug 2020

      So like, you could have this design. You hook up two tubes to 1 and 2, then rotate to he first position, and can suck 1ml of fluid from 1, then rotate to 2, and dispense half a mlpic.twitter.com/MoRrKOmgxj

      3 replies 1 retweet 35 likes
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    5. foone‏ @Foone 8 Aug 2020

      So yeah. This thing is basically two servos/stepper motors, a microcontroller, and a syringe & distribution valve.

      1 reply 1 retweet 31 likes
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    6. foone‏ @Foone 8 Aug 2020

      It's got some interesting functionality in the microcontroller. Like, all the commands are strings, right? so it has an option where you can give it command strings and have them written into the EEPROM, then later you can just call them with a single command.pic.twitter.com/scud7ULscN

      2 replies 1 retweet 31 likes
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    7. foone‏ @Foone 8 Aug 2020

      That's kinda weird. I'm not sure why you'd really need that. The serial port is plenty fast so this isn't going to be for speed reasons, and you've got to be communicating with it from a computer, right? I guess this makes it usable from a dumb terminal?

      2 replies 0 retweets 28 likes
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    8. foone‏ @Foone 8 Aug 2020

      They even point out that although each command string can only be 128 bytes long, you can end them with a command to run another command string. So you could in theory link up all 15 strings and have almost 2 kilobytes of program space

      1 reply 1 retweet 26 likes
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    9. foone‏ @Foone 8 Aug 2020

      Tecan has apparently discontinued it but they used to sell a liquid that they suggested you clean the internals of the product with, which had the great name of ROBO SCRUBpic.twitter.com/tv8UO0X6vJ

      2 replies 5 retweets 71 likes
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    10. This Tweet is unavailable.
      eigenrobot‏ @eigenrobot 8 Aug 2020
      Replying to @dicknoramus @Foone

      Maybe this is why soap doesn't work for me 🤔

      1:31 PM - 8 Aug 2020
      0 replies 0 retweets 0 likes

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