Author Topic: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown  (Read 1744 times)

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Offline Windfall

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #25 on: March 18, 2017, 08:59:06 AM »
"EEVBlog : the oscilloscope !"  :)
 

Online Brumby

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #26 on: March 18, 2017, 11:24:29 AM »
What?
A  EEVBlog branded  scope?   :-+



You don't remember last year's Scope Month, do you?
 

Online Brumby

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #27 on: March 18, 2017, 11:33:21 AM »
Dave's announcement of the 2016 Scopemonth promotion - (LAST year's)

https://www.youtube.com/watch?v=6xaSYi_n6fw#t=2m17s

I do love that dumpster ... !
« Last Edit: March 18, 2017, 11:45:37 AM by Brumby »
 

Online Brumby

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #28 on: March 18, 2017, 11:50:22 AM »
Here's a shot of the front panel, showing the power on splash screen...
« Last Edit: March 18, 2017, 12:04:12 PM by Brumby »
 

Offline james_s

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #29 on: March 18, 2017, 04:21:00 PM »
Does it make snarky remarks if you try to do something it doesn't like?
 

Online Brumby

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #30 on: March 18, 2017, 05:35:37 PM »
Not that I know of.

It just has Dave's trademark graphic to do that.
 

Offline Windfall

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #31 on: March 19, 2017, 04:48:23 AM »
Not that I know of.

It just has Dave's trademark graphic to do that.

It's a rather unfortunate logo isn't it. It looks like Dave trying to warn you against using this scope !
 

Offline Twoflower

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #32 on: March 19, 2017, 07:12:43 AM »
The downlooking IR-sender/receiver combo is to prevent to fall down stairs. At least the Rooma has some trouble with it there are reports that they not work 100% (dust?) and it also prevents to use them on very dark tiles/carpets (cover with white paper solves this, but it makes the Roomba blind for stairs).

The UV is probably meant to desinfect the floor. How useful it is? I don't know. Probably marketing.

For the Roomba the base station sends two different beams for left and right to identify the alignment between base-station and vacuum. The Top-signal is (again for Roomba) used to prevent the Roomba hitting the base-station.

I think the piezos are only used as impact detector. If dirt is detected it changes the cleaning mode.

Below is a picture of a Roomba in action with a old** NightVision (no IR filter) capable Sony video cam. In IR it makes a nice light-show.

** Yes it uses tape, and the good old PAL resolution ;D
« Last Edit: March 19, 2017, 07:14:50 AM by Twoflower »
 

Online Brumby

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #33 on: March 19, 2017, 12:35:21 PM »
Not that I know of.

It just has Dave's trademark graphic to do that.

It's a rather unfortunate logo isn't it. It looks like Dave trying to warn you against using this scope !

Not against using the scope - just the reaction you'd get when about to clip the ground lead of the probe to somewhere you shouldn't.

Maybe that's why they put that graphic down near the input sockets.....
« Last Edit: March 19, 2017, 12:37:05 PM by Brumby »
 

Offline Alexei.Polkhanov

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #34 on: March 21, 2017, 09:14:59 AM »
Cold cathode UV lamp to kill bacteria in dust collector?

 

Offline thm_w

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #35 on: March 21, 2017, 10:32:46 AM »
Cold cathode UV lamp to kill bacteria in dust collector?
https://en.wikipedia.org/wiki/Ultraviolet_germicidal_irradiation

Yes to kill bacteria, no not in the dust collector as it was pointing down towards the floor.
The cover is likely plastic as well (best case glass) which will block a decent percentage of that UVC. As others have stated, its essentially a gimmick.
 

Offline james_s

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #36 on: March 21, 2017, 11:15:35 AM »
I doubt it would spend enough time over any given area to kill a significant amount of bacteria, and if it did, it would fade the carpet.
 

Online bitwelder

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #37 on: March 21, 2017, 05:01:18 PM »
Generally how long would it take for a UV lamp to kill bacteria? I guess more than a few seconds.
Considering the location of the lamp on the RoboMaid it would 'disinfect' the floor one poststamp-sized tile at a time. It doesn't look much practical to me.




 

Offline Paul Moir

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #38 on: March 21, 2017, 05:18:27 PM »
It depends on the exposure strength mostly.  It's pretty much a linear relationship with most microbes.  The other thing is how many microbes you want to kill.  1 second might get you 1 log reduction, then 2 seconds gets you 2, etc, so a log relationship on that.
And of course it depends on the microbe:  some are pretty hardy while others are wimps.  That all said, I can't imagine this would work very well on carpet where I expect most the microbes would be hiding down inside and well protected from the UV.
EDIT:  I don't think that really answers you question.  Lets just say that to kill almost all of a fairly average nasty you'll need exposure from a 253nm UV source to the point where you're you're going to get skin irritation.  This little bulb may actually kill the occasional bug but it's not going be sterilizing anything.
« Last Edit: March 21, 2017, 05:32:24 PM by Paul Moir »
 

Offline SeanB

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #39 on: March 22, 2017, 05:23:56 AM »
There to find the nose candy you dropped, so you can grab it out of the dust collector. Will also work to annoy any bacteria on the carpet.
 

Offline Domagoj T

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #40 on: March 22, 2017, 06:56:24 PM »
What's the deal with the wheel drive? It's a rather complicated system, having stepper motors and drivers, optical encoders, logic for both and then the belt and worm gear.

While, generally speaking, I like stepper motors and their simple control logic, once you introduce optical encoders you can easily use regular DC motors which are cheaper, produce less noise, require simpler electronics and are more energy efficient (something that is usually an interesting aspect in a battery operated device).

Now I'm thinking of going to flea markets and salvage some Roombas for their motors.
 

Offline Zbig

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #41 on: March 22, 2017, 07:03:20 PM »
What's the deal with the wheel drive? It's a rather complicated system, having stepper motors and drivers, optical encoders, logic for both and then the belt and worm gear.

While, generally speaking, I like stepper motors and their simple control logic, once you introduce optical encoders you can easily use regular DC motors which are cheaper, produce less noise, require simpler electronics and are more energy efficient (something that is usually an interesting aspect in a battery operated device).

Now I'm thinking of going to flea markets and salvage some Roombas for their motors.

Do you read threads also or only reply? :P I commented on that in the 4th or so post. Dave's not that big on (electro)mechanics and sometimes makes mistakes like that.
 

Offline Domagoj T

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #42 on: March 22, 2017, 08:34:55 PM »
Do you read threads also or only reply? :P I commented on that in the 4th or so post. Dave's not that big on (electro)mechanics and sometimes makes mistakes like that.
My bad. Not sure if it's an excuse, explanation or an even bigger hole I'm digging for myself, but I did read you comment a few days ago, it's just that I occasionally take my time to jump in the conversation.
In any case, I've rewatched the segment with the motor and it really is just a regular DC thingy. A PCB on the motor and a bunch of wires leading to it, combined with Dave's mistake contributed to my own perception that it is a stepper, so I didn't give your post the credit it deserved. My apologies.

Also, for the last couple of weeks I've been working on several different stepper applications of my own, so I'm starting to see them everywhere.
 

Offline Zbig

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #43 on: March 22, 2017, 08:44:28 PM »
No need to apologize, my comment was a bit too harsh :) Peace! :-+
 

Offline ErikTheNorwegian

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Re: EEVblog #980 - RoboMaid Automated Vacuum Cleaner Teardown
« Reply #44 on: March 24, 2017, 12:39:59 AM »
From:

"http://tothotornot.com/2013/08/hot-robomaid-robot-vacuum-cleaner/

An unexpected feature that I discovered when I first turned on the Robomaid was a little blue light and ‘UV’ on the display screen. Turns out that the machine includes an in-built UV light which apparently kills bacteria, germs, dustmites and microscopic insects as it vacuums. I have no scientific data to back up whether this in fact occurs but I figure it can’t hurt, especially as Tim suffers from hayfever and my nose is pretty sensitive to dust."

The UV light seems to killed the company to..

http://www.commerce.wa.gov.au/announcements/consumer-advice-buyers-robomaid-vacuum-cleaners

"Consumer Protection has issued advice to WA consumers who have ordered a Robomaid automatic vacuum cleaner and are yet to receive it, to claim a chargeback from their credit card provider or PayPal.

Robomaid Australia, the company which has been importing the product from China, has ceased to trade but has not yet appointed a receiver or liquidator."

« Last Edit: March 24, 2017, 12:44:01 AM by ErikTheNorwegian »
 


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