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Battery powered 5v port
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Battery powered 5v port

by Schadow63 on Mon Apr 05, 2021 4:17 pm

I have itsy bitsy 5v microcontroller. I have a servo connected to 5v port but it only works when connected to usb but not when connected to 9v battery. Can you get power from 5v port when only on battery power?

Schadow63
 
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Re: Battery powered 5v port

by adafruit_support_bill on Mon Apr 05, 2021 4:49 pm

The problem is that a 9v battery cannot supply enough current to run most servos. You would be better off with something like a 6xAA battery pack.

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Re: Battery powered 5v port

by Schadow63 on Mon Apr 05, 2021 8:14 pm

Oh, ok. It's running the high torque 6v dc motor so I thought the servo would be easier. It's a small toy and I don't have room for 6 batteries. When I push button to activate servo the itsy bitsy flashes red and I have to hit the reset button to restart. Does the red light indicate not enough current?

Schadow63
 
Posts: 3
Joined: Mon Apr 05, 2021 3:53 pm

Re: Battery powered 5v port

by adafruit_support_bill on Mon Apr 05, 2021 8:42 pm

The flashing red light is most likely because the processor has reset. When a servo starts to move, it pulls a lot of current. The 9v battery probably can't keep up with it, so the output voltage drops and causes the processor to reset.

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Re: Battery powered 5v port

by Schadow63 on Thu Apr 08, 2021 2:22 pm

I think I figured it out. The battery has an output current of 1000MA and the ItsyBitsy has a 150MA output current when on battery power. So I need a separate power supply or find a microcontroller that has 500MA output.

Schadow63
 
Posts: 3
Joined: Mon Apr 05, 2021 3:53 pm

Please be positive and constructive with your questions and comments.