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Post by oflameo on Sept 6, 2017 18:38:36 GMT
How does the DRV8825 potentiometer work? Does the voltage step every revolution or does it change at some other interval. This stumped me.
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Post by Derek the Admin on Sept 6, 2017 21:38:10 GMT
It is continuous and will "wrap around." It starts at about 1.7 volts and as you turn it clockwise it decreases in voltage. The adjustments are VERY sensitive. I highly recommend the alligator clip method talked about in the instructions. It cuts down on a lot of set up time for it.
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Post by kec-10238 on Sept 6, 2017 22:44:58 GMT
can put a missile on a pin head 6000 miles away - so you'd think there would be an easier way to have these things set and stay at the right #....lol
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Post by oflameo on Sept 7, 2017 10:15:42 GMT
I want to get this right, it will wrap around every full revolution?
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Post by Derek the Admin on Sept 7, 2017 12:12:14 GMT
Yes. Last I tried it will wrap around. You do not need to wrap around though. The voltage you are going for can be achieved without making a full revolution.
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Post by oflameo on Sept 7, 2017 14:56:02 GMT
I am pretty much getting 1.6 volts to 1.1 volts, or 0 volts.
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Post by Derek the Admin on Sept 7, 2017 15:33:04 GMT
Are you using the alligator clip method? It makes it a lot easier.
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Post by oflameo on Sept 7, 2017 15:36:56 GMT
I am using a modified version because my clips are still in the mail. I use a wire I stripped out of an Ethernet cable for a single wire and wrapped it around a PC Socket screwdriver. I get a circuit but it has too much power going through it.
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Post by oflameo on Sept 8, 2017 13:06:20 GMT
Derek graciously took time out of his busy day and acted as a sounding board from me to help me think through the problem. Turns out, I had a brain failure and contentiously ignored the power instructions because I was subconsciously afraid of the high amperage of the power brick and I mistakenly though I can configure the drivers directly if I had only the arduino powered. That demonstrated a fundamental lack of understanding of electricity. I am really glad I ordered the kit so I can learn what I don't know because otherwise I would never figure it out.
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Post by Derek the Admin on Sept 8, 2017 13:43:32 GMT
Oflameo, I was very happy to help. Sometimes it's very easy to be focused on something and not take a step back. I find myself doing the same thing sometimes too. If you ever need anything else, we are here to help.
Derek
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Post by Bruce on Sept 10, 2017 1:55:10 GMT
That was a persnickety adjustment to say the least. I tried three different screw drivers. Finally had to break out the jeweler's screwdriver set.
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