1. Summary
  2. Files
  3. Support
  4. Report Spam
  5. Create account
  6. Log in

Gap crossing robot

Share your building instructions or ask questions about constructing your robot

Re: Gap crossing robot

Postby mattallen37 » 20 May 2011, 20:03

nxtreme wrote:...Speaking of which, I wonder how hard it would be to install a heatsink on the motor drivers...

I wouldn't try it. There really isn't that much room in the NXT. The IC's are not meant to have a heat-sink connected. The IC's are rated 1amp, and I don't know that it is a thermal limitation.

If I were to mess with an NXT PCB to increase the current rating for the motor drivers, I would probably remove the H-Bridges, and solder in some bigger ones. Although, if you didn't need every function of the output (like brake and coast), you could use external H-Bridges and leave the NXT alone. Or, you could make an I2C U-Controller H-Bridge driver instead (like I did).
Matt
http://mattallen37.wordpress.com/

I'm all for gun control... that's why I use both hands when shooting ;)
User avatar
mattallen37
 
Posts: 1818
Joined: 02 Oct 2010, 02:19
Location: Michigan USA

Re: Gap crossing robot

Postby nxtreme » 27 May 2011, 22:24

mattallen37 wrote:I wouldn't try it. There really isn't that much room in the NXT. The IC's are not meant to have a heat-sink connected. The IC's are rated 1amp, and I don't know that it is a thermal limitation.

You're right, they're not meant to be used with a heat sink, but most electronics usually go up in smoke when they die and we all know that where there's smoke there's a fire. While not very practical, I do think you could get at least an extra 100mA through a motor driver safely with a heat sink, calm the fire so to speak.

And yes, I could always just build a motor driver. Not a bad idea, considering I could make one for about five dollars...
One King to rule them all, One King to find them,
One King to bring them all and in the darkness bind them
On Earth where Shadows lie.
User avatar
nxtreme
 
Posts: 246
Joined: 29 Sep 2010, 03:53
Location: 192.168.1.2

Previous

Return to Robot Building

Who is online

Users browsing this forum: No registered users and 0 guests