#robotics Logs

Jan 29 2019

12:02 AM rue_mohr: my idea for an air flow meter didn't work
04:14 AM veverak: deshipu: cool
04:28 AM deshipu: looks like the use the same protocl as the dynamixels
04:28 AM deshipu: they
04:29 AM deshipu: shame they only have 240° rotation
04:29 AM deshipu: I wonder why
04:31 AM veverak: cheaper encoders
04:31 AM veverak: :)
04:51 AM deshipu: I don't think so, because it has a continous rotation mode and can report its position in every position
04:51 AM veverak: can it?
04:51 AM veverak: I did not noticed that said explicitly
04:53 AM deshipu: I saw that in some of the reviews
04:55 AM veverak: as that is not usually the case... (continous rotation encoders with decent res. are expensive afaik)
04:56 AM deshipu: just put the encoder before the gearbox, then even one pulse per revolution gives you good resolution ;-)
04:58 AM veverak: but you accumulate error from backlash :)
05:15 AM deshipu: you can put it on one of the intermediate gears for a good compromise
08:54 AM rue_mohr: postentiometer gives you about 300 degrees
08:55 AM rue_mohr: OR they used an 8 bit position reg and can only use 240 counts of it
03:26 PM Mikeee: a 10 cent uC could handle 128 bit position tracking, and encoders are cheap as shit
03:27 PM Mikeee: just realized that conversation was 10 hours ago
03:27 PM Mikeee: haha
04:30 PM Snert_: that's okay. We're timeless.
04:32 PM veverak: rue_mohr: deshipu: there is a big chance that I will open them when I will have them
04:33 PM veverak: to see what they are made of
04:39 PM deshipu: mostly inedible parts, sadly
07:33 PM Tom_itx is now known as Tom_L
08:44 PM rue_mohr: Mikeee, 10c? wtf can you get for 10c?
08:51 PM Tom_L: a 10c piece of anything
08:51 PM Mikeee: you can get microcontrollers for less
08:52 PM Tom_L: remember the good ole days when you could call and get free samples?
08:53 PM Mikeee: that too
08:55 PM Mikeee: https://www.alibaba.com/trade/search?IndexArea=product_en&SearchText=microcontroller&f0=y&pricef=0.01&pricet=0.11
08:55 PM Mikeee: 10 cent knockoffs of 25 cent microcontrollers
09:58 PM rue_mohr: 8051, huh
09:59 PM rue_mohr: is the tiny45 better than the tiny13?
10:00 PM rue_mohr: WHAAAAT NO WAY a full-on 8051 for 10c?
10:01 PM rue_mohr: no, no, shipping will be like $50
10:17 PM orlock: rue: https://hackaday.io/project/9133-reworking-the-ai-thinker-black-board-t5
10:18 PM orlock: i forget if i showed you that thing