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Where to buy cheap TT motors with speed encoders built-in


Phil_2020
(@phil_2020)
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Joined: 3 years ago
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Topic starter  

Hi,

Where can I get some cheap (<$10.00) 6 volt motors with speed encoders (Hall effect)  built in ? Preferably those cheap yellow ones so I can replace my already existing motors with encoder motors without having to rig up some other mounting system.

I tried using the opto-interrupter encoders, but they are really sloppy.

Best regards,

Phil

 


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Duce robot
(@duce-robot)
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Joined: 3 years ago
Posts: 669
 

I don't know if a cheap version of that motor exists . the ones I've seen have been between $30 $60.👍😀


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robotBuilder
(@robotbuilder)
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Joined: 3 years ago
Posts: 1373
 

I used Roomba geared motorized wheels that come with hall effect encoders. The Roomba robot cost me $20 at a home garage sale. The robot's batteries had failed. I used a spare 18v portable drill battery.

newBase

I also bought a new robot vacuum cleaner for AU$150 which came with encoder enabled geared motorized wheels and some other motors, a battery with charger and a bunch of sensors. Much cheaper than trying to buy them individually.

newBase2

 


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JBeazy
(@jbeazy)
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Check out Pololu.  See item #1523 Magnetic Encoder Pair Kit for Mini Plastic Gearmotors, 12 CPR, 2.7-18V.  And they have a variety of "TT like" gearmotors https://www.pololu.com/category/158/mini-plastic-gearmotors. The encoders go on the motor shaft not the output so you need an extended shaft motor.  Not sure if these endoders could be adapted to the yellow TT motors.

The encoders come in pairs. So two motors & encoders under $10 each.  But then there's shipping.


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Spyder
(@spyder)
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@jbeazy

Adafruit has something like that with metal gears...

https://www.adafruit.com/product/3802

I'm using those in one of my bots, although, I did have one go bad, probably my fault, but, it's also, in my opinion, a rather poor design if you're putting too much stress on it, as the tolerances in the gears are extremely touchy

Adafruit also sells these...

https://www.adafruit.com/product/3782

Which fit on the shaft of the motors I just posted. You'd still need to get an encoder reader. Some kind of cheap IR LED thing which fits over the encoder. Something like this...

https://www.adafruit.com/product/3986

Or, you could do something else


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JBeazy
(@jbeazy)
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Posted by: @phil_2020

Hi,

Where can I get some cheap (<$10.00) 6 volt motors with speed encoders (Hall effect)  built in ? Preferably those cheap yellow ones so I can replace my already existing motors with encoder motors without having to rig up some other mounting system.

I tried using the opto-interrupter encoders, but they are really sloppy.

Best regards,

Phil

 

Do you mean mechanically sloppy?  Or output signal is sloppy or other.


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robotBuilder
(@robotbuilder)
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Joined: 3 years ago
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I bought one of those toy robot bases with the "yellow" motors from Jaycars (Australia) as used by Bill in his tutorial. They are really rubbish compared with the Roomba motors and not cheap to buy in this country!

https://dronebotworkshop.com/robot-car-with-speed-sensors/

Today, as was true in the the old days, not many people are interested in electronics as a hobby but in the old days at least there were physical retail outlets that sold most of what you needed and the sales persons actually knew about they were selling.  I like to see and touch things before I buy them.

 


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Spyder
(@spyder)
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Posts: 926
 

@casey

Those yellow ones are the ones with plastic gears in the gear housing. They're the same motor and housing as the Adafruit blue ones I posted a link to, with the difference being that the blue ones are metal gears

I think there's like a dollar difference in price

The metal gears are obviously stronger, and the plastic ones are a little more forgiving, on the other hand, they're forgiving because they're plastic and they can slip

I know because I have both. 

And yes, I took them apart 😎 


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Phil_2020
(@phil_2020)
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Joined: 3 years ago
Posts: 26
Topic starter  

@jbeazy

Hmm. I mean :

1. Jamming them in a slot and bolting one side down is weird.

2. The black encoder wheel wobbles on the axis

3. Two encoded wheels give two different number of turns

4. Both number of turns are too high for the distance/circumference.

 


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