#robotics Logs

Feb 04 2019

02:25 AM SleepyTurtle1 is now known as SleepyTurtle
05:54 AM L30nArd0: Hello guys !!! Can anyone suggest some material on mathematical modelling. Thanks.
07:02 AM SleepyTurtle: L30nArd0 of what?
07:43 AM veverak: https://cz.mouser.com/ProductDetail/MEAN-WELL/LPV-20-12?qs=O2yOKspD61CWsj7HIi9WpA%3D%3D
07:43 AM veverak: so
07:43 AM veverak: I have this meanwell power source
07:43 AM veverak: for my leds
07:43 AM veverak: does it need some load?
07:44 AM veverak: I want to enable/disable multiple devices with relays,so I was wondering to put the relay board "after" the power source in the power chain
07:45 AM veverak: I wonder if this thing will be OK with no load when turned ON constantly
07:54 AM deshipu: check the datasheet?
07:58 AM veverak: deshipu: nothing there
07:58 AM veverak: not even current without load :/ (they always consume at least something)
07:59 AM deshipu: ask them?
08:21 AM veverak: asked my leader at university
09:29 AM rue_mohr: they wont care cause its plugged in
09:30 AM rue_mohr: uh, .25mA sounds too high for leakage
09:31 AM veverak: btw:
09:31 AM veverak: https://www.aliexpress.com/item/Free-shipping-DIP-1PCS-DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-1/32721507753.html
09:31 AM veverak: got this
09:31 AM veverak: need to configure it
09:32 AM veverak: not sure how to give it some load
09:32 AM veverak: found only 1M resistors here :/
09:32 AM rue_mohr: what voltage do you want out
09:32 AM veverak: 9V in, 5V out
09:32 AM veverak: without load, there is 8.5V out no matter how I turn the pot
09:33 AM rue_mohr: plausable
09:34 AM veverak: how to do it?
09:34 AM veverak: have to find... let's say 100k resistor?
09:37 AM veverak: got motor here
09:37 AM veverak: but I've got the feeling that that would overload it
09:40 AM veverak: wat
09:40 AM veverak: gave it 2kOhm resistor
09:40 AM veverak: still 8.5V on output
09:54 AM rue_mohr: then its borked
09:54 AM rue_mohr: 2k should bring it down
09:55 AM rue_mohr: your sure you have tried cranking it all the way both ways
09:55 AM rue_mohr: 10 turns
09:55 AM rue_mohr: till it clicks
09:56 AM mrdata| is now known as mrdata-
09:57 AM veverak: wait
09:57 AM veverak: definetly did more than 10 turns (a lot more)
09:57 AM veverak: and never lcicked
09:59 AM rue_mohr: try the other way, they usually click at the end of stroke
10:03 AM rue_mohr: its quite possible its duff
10:03 AM rue_mohr: how many did you get?
10:05 AM rue_mohr: why did you think, at that price, you could get just one and it would work fine like you'd paid $5 for it and could get a warrantry replacement around the corner from the seller?
10:06 AM veverak: I did not order it ali
10:06 AM veverak: it's from local shop
10:06 AM rue_mohr: ah good, take it back
10:06 AM veverak: rue_mohr: there is a bag of them
10:06 AM rue_mohr: ah good
10:06 AM rue_mohr: try another one
10:07 AM rue_mohr: even 1-2k should be enough to bring down past its output spikes
10:07 AM veverak: also
10:07 AM rue_mohr: doesn't it have an output led?
10:07 AM veverak: one should be perfectly fine as load for setting another no?
10:07 AM veverak: yeah, they have output led
10:08 AM rue_mohr: the output led should hold it down
10:08 AM rue_mohr: min voltage is often 1.4 or more
10:08 AM rue_mohr: you should be abel to chain them ok
10:14 AM veverak: ah
10:14 AM veverak: rue_mohr: ok, it was many turns out of hte position where it should be
10:14 AM veverak: it's good idea to measure the pot itself
01:37 PM rue_mohr: I run them from end to end to establish which way is up
04:53 PM jay is now known as Guest43605
10:51 PM BitEvil is now known as SpeedEvil