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Author Topic: $8 Atmega8 + 3 20Amp 1/2 Bridges  (Read 429 times)

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Offline martoTopic starter

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$8 Atmega8 + 3 20Amp 1/2 Bridges
« on: May 05, 2011, 07:23:37 PM »
That is basically what these are.
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15202

Do you guys think that something like this would be worth turning into a <$50 robot tutorial or a standalone example? I know it could be done but I am just wondering if there is any interest.

The microcontroller is a Atmega8 the only downside is you only have access to 4 pins without some soldering skills. (INTO, SCK, MISO, MOSI and the relevant pins) But for the price and the convenience of the high current 1/2 bridges its probably worth while.

Oh and for those of you saying I need four bridges, yes technically I do but I am working on a few ways of sharing one between the two motors. I have demonstrated it with just bang bang RC control but getting PWM integrated is still a bit iffy. Basically the drawback is you are limited to when you are turning.

Steve

Offline waltr

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Re: $8 Atmega8 + 3 20Amp 1/2 Bridges
« Reply #1 on: May 05, 2011, 08:56:37 PM »
No, that device is to control one BRUSHLESS motor. It will not work as three independent H-bridges to control BRUSHED DC motors.

Offline martoTopic starter

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Re: $8 Atmega8 + 3 20Amp 1/2 Bridges
« Reply #2 on: May 05, 2011, 09:01:51 PM »
Yes Yes it will.

My current work
http://www.robowars.org/forum/viewtopic.php?t=1581

Oh and they are not H bridges, they are 1/2 bridges. 2 1/2s makes a H.

 


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