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Hi,After I posted it, I realized that there have been a lot of talk about using two batteries (9V and ~4.8V).Is there a need for two battery connectors?Personally, I'd think a 5 cell NiMH would be able to handle both being regulated with an LDO regulator (if run down to no lower than 1.1V/cell) and the Servos.5 cells would have a charge termination voltage of around 7.25V, but will quickly drop to around 6.75V when removed from the charger.When loaded, the voltage should stabilise at 6.25V max.Another option is a switching regulator (either buck or boost), but what do people think?
Would you by chance be able to post up a gerber file, that would make the process way easier.
My vote is for single voltage supply. Its easier.
Also, soldering single 3 pin male headers are a pain to get aligned correctly. I recommend doing them flush like on my Axon.
Lastly, include a separate 6-pin ISP header connection. 8 pin programmers are becoming obsolete.
May I ask what software you used to make the $50 Robot PCB. I see that the end result is in PDF.
Wouldn't it be better to use just the 6-pin connector then?I assume there's a standard pinout for that I should follow - anyone has got a link to such a pinout?Or should it just be what gives the best/easiest layout?
It has an internal pull up, dont worry about that (just dont leave your programmer plugged into it without power).I think you have the orientation of the programmer pins wrong. You have pin one going to VCC, instead of MISO. Pin two you have going to MISO instead of VCC. etc. etc. See if that works. -Buk
Quote from: Admin on October 05, 2009, 12:48:23 PMAlso, soldering single 3 pin male headers are a pain to get aligned correctly. I recommend doing them flush like on my Axon.I'm not certain about what you mean by soldering them flush. I do know the semantics of the sentense, but flush with what? I studied the photos of your Axon but didn't get any wiser.Even though it's shown as 3 pin connectors, I'd recommend using 3 long strips laid the other way, as it is far easier to solder them that way, perhaps that's what you mean?
Quote from: Admin on October 05, 2009, 12:48:23 PMLastly, include a separate 6-pin ISP header connection. 10 pin programmers are becoming obsolete.Wouldn't it be better to use just the 6-pin connector then?
Lastly, include a separate 6-pin ISP header connection. 10 pin programmers are becoming obsolete.