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Author Topic: Continuos Rotation HS-311 Servo w/ Sharp IR  (Read 2721 times)

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Offline Nate_the_GreatTopic starter

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Continuos Rotation HS-311 Servo w/ Sharp IR
« on: June 28, 2007, 03:37:47 PM »
OK, two quick questions about adding IR rangefinder to the $50 robot:  ???

1) If I do not use the rangefinder reccommended from this link
(http://www.acroname.com/robotics/parts/R48-IR12.html)

and instead use another similar one will I have problems connecting it? the one I ordered:

http://thebotshop.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GP2D120XJ00F&Category_Code=CK

2) I see from the picture of the modified robot that the photosensors were not removed when the rangefinder was put on, were they not removed for a reason/ can they be removed when the rangefinder is added? 

Offline robotvisionary

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Re: $50 Robot with Sharp IR Rangefinder
« Reply #1 on: July 08, 2007, 05:44:38 AM »
OK, two quick questions about adding IR rangefinder to the $50 robot:  ???

1) If I do not use the rangefinder reccommended from this link
(http://www.acroname.com/robotics/parts/R48-IR12.html)

and instead use another similar one will I have problems connecting it? the one I ordered:

http://thebotshop.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GP2D120XJ00F&Category_Code=CK

2) I see from the picture of the modified robot that the photosensors were not removed when the rangefinder was put on, were they not removed for a reason/ can they be removed when the rangefinder is added? 


1) the rangefinder should work but if you really want to kick it up a knotch use 12.50 rangefinder like this one http://www.acroname.com/robotics/parts/R144-GP2Y0A02YK.html it is better and cost the same price.

2)  ??? I really don not know but that is a really interesting question. Why dont you send a personal messege to the admin to see if he can answer that question to you. One's you get the answer send me a personal message with the answer. Pls put the topic title. ???
« Last Edit: July 08, 2007, 06:26:23 AM by robotvisionary »
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Offline Nate_the_GreatTopic starter

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Continuos Rotation HS-311 Servo w/ Sharp IR
« Reply #2 on: July 09, 2007, 02:38:33 PM »
I ordered two HS-311 continuos rotation servos and they are very similar to the unmodified HS-311 I ordered for the Rangefinder, except their are dials with three wires sticking out of them (green, yellow, red). When I twist them they seem to make the servos reverse their rotation, with the rangefinder upgrade does it matter which position the dials are at to make the servos respond to the rangefinder? Because they don't seem to respond to the rangefinder unless they are in a certain position.

Offline Admin

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Re: Continuos Rotation HS-311 Servo w/ Sharp IR
« Reply #3 on: July 11, 2007, 08:07:39 PM »
Dials? What do you mean?

Also, you need to use unmodified servos for the rangefinder upgrade . . .

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Re: Continuos Rotation HS-311 Servo w/ Sharp IR
« Reply #4 on: July 11, 2007, 08:10:36 PM »
Quote
2) I see from the picture of the modified robot that the photosensors were not removed when the rangefinder was put on, were they not removed for a reason/ can they be removed when the rangefinder is added?
No reason to remove them . . . its what's inside (the source code) that truely matters :P

Offline KambeiX

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Re: Continuos Rotation HS-311 Servo w/ Sharp IR
« Reply #5 on: July 11, 2007, 08:12:56 PM »
The "dial" is a variable resistor used to center the servo.

You send a 1.5ms pulse every 20ms and turn the potentiometer until the servo ceases to move.

But anyways, this kind of servo is used for continuous rotation, y won't work with the range finder unless you add another kind of feedback (cuadrature).


Offline robotvisionary

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Re: $50 Robot with Sharp IR Rangefinder
« Reply #6 on: July 12, 2007, 06:19:46 AM »
Quote
1) the rangefinder should work but if you really want to kick it up a knotch use 12.50 rangefinder like this one http://www.acroname.com/robotics/parts/R144-GP2Y0A02YK.html it is better and cost the same price.



Is this rangefinder OK for the $50 dollar robot? Does it affect the code?
I've have not failed, I've just found out 2,000 how a light bulb will not work

                              Thomas Edision.
[youtube]59xcT1dstq4[/youtube]

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Re: Continuos Rotation HS-311 Servo w/ Sharp IR
« Reply #7 on: July 12, 2007, 06:47:40 AM »
Yeap it will work.

You may have to change a threshold variable, but thats all it will change in the code.

Offline Nate_the_GreatTopic starter

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Re: Continuos Rotation HS-311 Servo w/ Sharp IR
« Reply #8 on: July 13, 2007, 10:51:01 AM »
I know that the servo for the rangefinder is unmodified, I am reffering to the two continuous rotation servos driving the wheels. When I turn the pots or dials they seem to make the servos turn in different directions, The problem is when I turn them, sometimes they do not seem to respond to the rangefinder, they just continuously rotate, I'm wondering if there's a certain position I must leave them at so that the two drive servos respond to the rangefinder.

Thanx  ;D

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Re: Continuos Rotation HS-311 Servo w/ Sharp IR
« Reply #9 on: July 13, 2007, 11:13:55 AM »

 


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