#robotics Logs

Jun 11 2018

12:21 AM Jak_o_Shadows: Hmmm. I can get a single 12V relay module thing for .66 AUD. Or I can get opto-isolated set of 4 for 3.67
12:25 AM Jak_o_Shadows: Yeah, that's probably the better deal. Just in terms of cable management as well
12:56 AM rue_shop4: there is a lesson for ya
12:56 AM rue_shop4: so, my buddy plugs in the sander and it trips the GFCI
12:56 AM rue_shop4: so we try again and it trips again
12:56 AM rue_shop4: I roll my eyes and give him a non-protected circuit
12:57 AM rue_shop4: I hear him yell and turn around to see smoke comming out of it
12:57 AM rue_shop4: suppose the GFCI was right.
12:57 AM rue_shop4: motor burned up, gonna tear it down later
12:58 AM rue_shop4: that little car, it says $194
12:58 AM rue_shop4: 4 easy payments of $50
12:58 AM rue_shop4: I can see why tho, no 3d printed parts
12:59 AM rue_shop4: Jak_o_Shadows, what are you looking for?
12:59 AM rue_shop4: I can bang off stuff like that in my sleep
12:59 AM rue_shop4: well, that is, I'm usually doing that stuff when I'm half alseep, saves resources for the real stuff
01:00 AM rue_shop4: please tell me what your looking for..... I'm curious
01:02 AM rue_shop4: wow, some of those prices are really out to lunch
01:31 AM Jak_o_Shadows: It's something for a model railroad type thing.
01:32 AM Jak_o_Shadows: It follows a steel wire in the ground. The reed switch turns the motor on/off.
01:32 AM Jak_o_Shadows: and the relay's I just bought are for electromagnets under the road
01:35 AM Jak_o_Shadows: Which I have yet to buy.
01:47 AM rue_: hmm
01:47 AM rue_: so its a wire following robot
01:47 AM rue_: car
01:49 AM Jak_o_Shadows: Yep
01:50 AM Jak_o_Shadows: The interesting bit is that you could use reed/magnetic sensors in the track to detect the track position
01:50 AM Jak_o_Shadows: the car position*
01:51 AM rue_: no its simnpler than that
01:51 AM Jak_o_Shadows: It is
01:51 AM Jak_o_Shadows: but you ~could~ do that
01:51 AM rue_: so
01:53 AM rue_: they are using the wire mechanically to steer it then
01:53 AM Jak_o_Shadows: yeah
01:56 AM rue_: ok, and the maget is what?
01:57 AM Jak_o_Shadows: The magnet mounted on the car is attracted to the wire to steer?
01:57 AM rue_: no
01:57 AM Jak_o_Shadows: THe electromagnet is to stop the motor in the car - you turn it on/off at traffic lights and such.
01:57 AM rue_: there is no steering motor on that
01:58 AM rue_: the only motor goes forward
01:58 AM Jak_o_Shadows: yes
02:20 AM rue_: why do you need this thing?
02:20 AM rue_: ... you have a bunch of track for it
02:20 AM rue_: and you wanted to find a car for it so you could use the track
02:21 AM Jak_o_Shadows: Nah, I have a bunch of boards, and it's a project to work on for someone else.
02:22 AM Jak_o_Shadows: Like, I built the terrain boards a few years ago, and want to use them, and it'll tie in nicely for someone else to use.
02:22 AM rue_: ... you have a bunch of track for it
02:22 AM rue_: and you wanted to find a car for it so you could use the track
02:22 AM Jak_o_Shadows: ok, sort of
02:22 AM rue_: :/
02:22 AM Jak_o_Shadows: Fair
02:22 AM rue_: mhmm
02:23 AM rue_: is there a rib in the middle of the track that steers it then?
02:24 AM Jak_o_Shadows: The track is just a steel wire underneath the road cover.
02:24 AM rue_: and after seeing the stupid price of that thing, your interest is tapering off
02:24 AM rue_: oooh a heavy steel that they use a magnet to pull the steering with
02:24 AM Jak_o_Shadows: yes
02:25 AM rue_: so, why is there a resistor on the damn thing, for effect?
02:25 AM * rue_ goes to bed
02:29 AM rue_bed: dont think your off the hook for asnwers
02:48 AM Jak_o_Shadows: erm.
02:48 AM Jak_o_Shadows: Hell, that's a good question
02:48 AM Jak_o_Shadows: Maybe they prepopulated it, for when you add headlights or somethg?
02:49 AM Jak_o_Shadows: Maybe there's a transistor on the other side - like if you had a normally open reed sensor?
02:49 AM * Jak_o_Shadows isn't sure how that would work
03:29 AM DIRT: anyone know of a decent data radio? there is fpv radios that have decent bandwidth but they only do video
03:44 AM rue_bed: always shyd away from bandwidth leaks
03:46 AM veverak: hmm
03:46 AM veverak: cmake
03:46 AM veverak: tricky
05:08 AM DIRT: can i collect some of that leaked bandwidth from my isp?
12:42 PM Guest61457 is now known as LoRez
12:42 PM CBloom: Hello, does anyone have ideas for measuring the load on a servo?
12:44 PM LoRez: CBloom: current draw is usually good. Surely some smarter servos will tell you what their load is.
12:45 PM CBloom: LoRez, I've heard this, but am not sure how reliable it is
12:45 PM CBloom: I'm looking to have a relatively strong servo detect very small changes in load
12:45 PM CBloom: Also, very quickly so I wouldn't have much time to average the current
12:46 PM LoRez: average the current? do you want average load or instantaneous load?
12:46 PM CBloom: instantaneous load.
12:47 PM CBloom: I've heard some people say to check current consumption over a very small amount of time to make the results less noisy
12:48 PM LoRez: you could probably do that in hardware. a small capacitor on the current sense lines for instance
12:48 PM CBloom: Sure. I'm looking to detect changes in load of less than a thousandth of what the servo is capable of
12:50 PM CBloom: about a thousand times a second
01:01 PM SpeedEvil: Add a strain guage to the mounts.
01:01 PM SpeedEvil: Current draw won't get you there.
01:05 PM CBloom: SpeedEvil, how quickly can I sample a strain gague? Am I able to query it 1000 times a second?
01:11 PM CBloom: Any recommendations for mounting a motor on load cells while still keeping it very rigid? Should I mount the motor on a swivel and limit its rotation with a load cell?
03:28 PM DIRT: how do i register a nick?
06:18 PM ace4016: DIRT, https://freenode.net/kb/answer/registration if you haven't found it
08:06 PM DIRT: yep found it.
08:06 PM DIRT: people seriously use the name dirt?
08:12 PM rue_: I thought all the simpel names were gone
08:12 PM rue_: geez, even rue can be a ****shoot
08:26 PM mrdata: all the simple names are gone; but even DIRT can churn
09:11 PM DIRT: well this might sound really innapropriate
09:47 PM SpeedEvil is now known as Guest15772