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4hv.org :: Forums :: General Science and Electronics
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Hot switching of Easystepper?

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Conundrum
Tue Jun 05 2012, 08:30PM Print
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi..
I found my intact Easy Step board from Sparkfun.

Does anyone else happen to have experience with these?
Specifically how to not have it fry if using it to drive more than one motor.
I have a cunning plan to power off the chip before switching but don't want to fry it again.

Thanks!
-A
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Patrick
Tue Jun 05 2012, 08:58PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
wait wait wait... !!!

Link2 is yours version 4.3? there is a known current flaw on the silk screen...!

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Conundrum
Wed Jun 06 2012, 08:03AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Yep, 4.3

I know about the pot being backwards, however my board seems to work.
I did notice that it needs a lot of power, is this normal? it seems to step and microstep correctly in both directions but the 5V light flickers..

I've mounted it on a double sided PCB to act as the power, ground and heatsink with a USB connector as the servo output.
Looks kludgy but ideal for swapping out motors without resorting to nasty screw type connectors, and can be modified with a magnetic switch to prevent damage to inadvertently plugged in pendrives etc.

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Patrick
Wed Jun 06 2012, 09:59AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
What about power? do you use external transistors?
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Conundrum
Wed Jun 06 2012, 08:13PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
I am also removing that trimpot and replacing it with an off board 10K multi turn pot so it can be remote set.

-A
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