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Ask an Expert Forum Solder able prototype board for 5A
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Solder able prototype board for 5A

flows
flows 7 days ago

Hello, 

I need to create an IoT project that will automate something in my life. So i am making a automatic sunscreen controller which will make the screen go up or down based on the weather.

Now im almost finished with the project, it was time to connect the electronics. I am no expert at electronics so i looked up if i can just connect the nema 17 stepper motor to the power supply via the breadboard. As of my knowledge the Nema 17, at its peak, takes 1.7 amps per coil, it has two coils. So thats at most 3.4 amps. I have a power supply to power everything of 12V and 5A. It will melt the plastic of the breadboard with that current. 

So i was thinking maybe i could just put it on a solderable prototype board which makes it more secure, safe, and i will gain some extra points (yes thats something you can score on).

But i have no idea how i can know what prototype board can handle that current. Its also not stated on the sellers page.

On a arduino form someone recommended this prototype board: https://www.amazon.co.uk/Gikfun-Solder-able-Breadboard-Arduino-GK1007U/dp/B07D7PMCG5

But when i ask AI it says the board will also melt. Am i being misled by AI Sob? 

Picture of system:

Note: in this picture i use a expansion board because i though i couldn't directly connect the DRV8825 to the breadboard. 

image

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Top Replies

  • obones
    obones 7 days ago +2
    Those will take quite a bit of current, the pads are quite large. If you use solder to "bridge" the gaps between the pads, you'll get a quite large metallic junction which should be fine for the current…
  • kmikemoo
    kmikemoo 7 days ago in reply to obones +2
    flows obones was faster than me. ...What he said. If you really want to run that current on the protoboard - for just the driver board, "reinforce" that part of the trace with 18 or 20 AWG. Tack it to…
  • obones
    obones 5 days ago in reply to flows +2
    ESP32 doesn't even come close to 1A, the regulator won't even get hot.
  • obones
    0 obones 7 days ago

    Those will take quite a bit of current, the pads are quite large. If you use solder to "bridge" the gaps between the pads, you'll get a quite large metallic junction which should be fine for the current you are looking at.
    But looking at your schematic, you may not even have to use that anyway, the highest current goes from the wall wart to the DRV8825 expansion board, and to the motor. Use thick cables for these connections, the rest can go on a regular breadboard.

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  • kmikemoo
    0 kmikemoo 7 days ago in reply to obones

     flows   obones was faster than me.  Laughing  ...What he said.  If you really want to run that current on the protoboard - for just the driver board, "reinforce" that part of the trace with 18 or 20 AWG.  Tack it to the trace pads and be generous with the solder.

    image

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  • flows
    0 flows 6 days ago in reply to obones

    Thanks obones  and kmikemoo for the quick answer! So i can connect the power supply to the voltage regulator via the breadboard? (Which then connects to the ESP, via the breadboard) Wont it get to hot for the breadboard? And then as you said just connect the power supply directly to the expansionboard. Just so i can test it, and know i have atleast something to show at school if the protoboard idea fails Smile

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  • obones
    0 obones 5 days ago in reply to flows

    ESP32 doesn't even come close to 1A, the regulator won't even get hot.

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  • Jan Cumps
    0 Jan Cumps 4 days ago in reply to $parentForumReply.Author.DisplayName

    AI generated

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