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Best ULN2003 Battery Pack(s)

Discussion in 'Power Electronics' started by NoviceNick, Nov 16, 2017.

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  1. NoviceNick

    NoviceNick

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    Nov 16, 2017
    I am comp-sci guy trying to learn electronics so forgive me if my question is lame and uneducated.
    I 3d printed a tower from my daughters favorite tv show and have built a working elevator in it using a 5v stepper, a uln2003 driver, and an arduino uno. It works seemingly well when both the driver and the arduino are powered by USB, but I'm ready to move from the USB to a rechargeable battery pack of some variety so she won't have to keep it pugged in at all times. I'm looking for something light so lead acid is probably out. I was thinking maybe like a 7.4v lipo battery.

    1.) Would the uln2003+5v stepper work when hooked up to a battery pack like this? I think the one I was looking at was like 1.5A current.

    2.) Can I power the UNO and the driver from the same battery pack or would it be wise to separate them on different battery packs?

    3.) Is there a better rechargable battery or power choice for this type of application?

    The elevator will get a lot of play, but doubtfully run for very long at a time. Safety is number one of course and since I'm using this mostly as a learning project I want to learn how to do things the right way. Thanks for any help you can provide!
     
  2. BobK

    BobK

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    1,688
    Jan 5, 2010
    Use a 5V power bank. It already had the USB port an provision for charging, and you can buy it for less than the batteries alone.

    Bob
     
    NoviceNick likes this.
  3. NoviceNick

    NoviceNick

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    Nov 16, 2017
    Is there any reason the uno and the driver shouldn't share the same power bank as long as it supports two USB outputs?
     
  4. BobK

    BobK

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    1,688
    Jan 5, 2010
    They can share it even if there is only 1 USB output, as long as the combined current is less than the port is rated for.

    Bob
     
  5. NoviceNick

    NoviceNick

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    0
    Nov 16, 2017
    Thanks Bob! I will give that a go.
     
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