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ST1000 embedded TinyPilot - Projectlog & Questions
#21
Thanks, will give that a try!

Compiling from Git myself is probably a step too far from now. So I'll probably wait for your new TinyPilot image. Would love the working WiFi client option in there.. So for now I probably ground it as I don't have a potentiometer on the rudderstock at the moment.
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#22
http://forum.openmarine.net/showthread.p...21#pid7321

its not to difficult to use git.
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#23
(2019-06-11, 07:52 PM)FMJ Wrote:  and the voltage dividers for shunt and voltage measuring hooked up to it:

FMJ, what value and power is your shunt resistor?
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#24
(2019-07-24, 12:16 PM)CapnKernel Wrote:
(2019-06-11, 07:52 PM)FMJ Wrote:  and the voltage dividers for shunt and voltage measuring hooked up to it:

FMJ, what value and power is your shunt resistor?

It is a 0,05 Ohm ceramic resistor. It is rated at 5W, not because that's necessary, but because it was easy and cheap to get on E-Bay.

You can also buy a 0,02 or 0,01 Ohm resistor. But because the normal current is so low, I decided to produce just a little bit more of heat in favor of a higher accuracy.

Will pick up this project again soon. At the moment about half of the circuitboard is assembled.
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#25
(2019-07-26, 11:22 AM)FMJ Wrote:
(2019-07-24, 12:16 PM)CapnKernel Wrote:
(2019-06-11, 07:52 PM)FMJ Wrote:  and the voltage dividers for shunt and voltage measuring hooked up to it:

FMJ, what value and power is your shunt resistor?

It is a 0,05 Ohm ceramic resistor. It is rated at 5W, not because that's necessary, but because it was easy and cheap to get on E-Bay.

You can also buy a 0,02 or 0,01 Ohm resistor. But because the normal current is so low, I decided to produce just a little bit more of heat in favor of a higher accuracy.

I bought some of these:

  https://www.aliexpress.com/item/32872505913.html

I figure if it gets too hot, I can put some in parallel, which as you say, will sacrifice accuracy for a reduction in heat.

I did see some large flat 4W SMD versions. I might get some of those in the future, but I thought the through-hole ones would be better for prototyping.

Mitch.
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#26
To get the most accuracy and least heat, you can use very low resistance (nano ohms) with an amplifier.
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#27
I hadn't thought of that, good idea.
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