Author Topic: $50 robot servo modifying  (Read 3298 times)

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Offline goatfishTopic starter

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$50 robot servo modifying
« on: March 29, 2008, 06:29:21 PM »
when you have to modify the $50 robot servos,do u just need to upload the .hex file and its done or do you need to do all that other stuff as well.if u do upload the file do u do it first then pull apart the servo or is it the other way around?

Offline ed1380

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Re: $50 robot servo modifying
« Reply #1 on: March 29, 2008, 07:20:14 PM »
you upload the .hex to the atmega8, and connect teh servps. they should center themselves. now you can continue modifying them.
this tells how to modify servos http://www.societyofrobots.com/actuators_modifyservo.shtml

or you could skip all of that and do this. but due to tolerance of resistors you might be a tad off. http://www.instructables.com/id/modify-the-hitec-hs-325-servo-for-continuous-rotat/
Problems making the $50 robot circuit board?
click here. http://www.societyofrobots.com/robotforum/index.php?topic=3292.msg25198#msg25198

Offline Webbot

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Re: $50 robot servo modifying
« Reply #2 on: March 29, 2008, 08:50:32 PM »
Undo the screws on the servo housing. Remove the gears on the left and right hand side so you just have the middle (bottom) gear left.

You will need to dremmel out the bottom of the main gear that fits over the pot as well as the ridge that acts as the end stop (I recommend you dremmel that as well rather than trying to snip it as first time round my snippers also broke the gear wheel in half). Having dremmeled the main gear then put it back in place and make sure it rotates 360 degrees without snagging. If all's ok then take it off again to expose the pot.

Plug the servo into the $50 circuit and download the 'hold the servo'.hex file. This will then pump out a 1.5 ms pulse to your servo which means 'Move to the center'. You should find that if you move the pot one way then the gear spins one way, turn the pot the other way and the gear spins the other way. If not - then something is wrong. So all you have to do is to move the pot to a central location where the gear stops spinning. The servo is then centererd and just needs a blob of glue on it to make sure that it doesnt move off center due to vibration etc.
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Offline goatfishTopic starter

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Re: $50 robot servo modifying
« Reply #3 on: March 29, 2008, 11:15:54 PM »
thanks a lot for that webbot,i printed it out ;) :) ;D 8)

 


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