<p>Typically in Arduinos, most of the 5&nbsp;V outputs that have a limited amount of current (40&nbsp;mA). </p>

<p>Are there any 3D printer boards, or is there even a more usual spot, where you can get a 5&nbsp;V output that isn't capped by the microcontroller?</p>

<p>I know that USB 2.0 is (typically) limited to 500&nbsp;mA especally when connected to a laptop. Just wondering if there was a way to for e.g. get a 200&nbsp;mA output from one of the 5&nbsp;V pins, or more if there is a stronger power supply connected to the USB port. </p>

[{'answer_id': 13725, 'author': 'Tom van der Zanden', 'author_id': 26, 'author_profile': 'https://3dprinting.stackexchange.com/users/26', 'pm_score': 3, 'selected': True, 'text': '<p>Any pin that is labeled as "5&nbsp;V" can supply the full amount of current. Looking at, for example, the <a href="http://domoticx.com/wp-content/uploads/2016/05/Arduino-MEGA-pinout.jpg" rel="nofollow noreferrer">Arduino MEGA pinout</a>, we can see several pins labeled in red with "5&nbsp;V". These are the pins you can use. Most 3D printer boards will expose the 5&nbsp;V pins at several points. For example, the endstop connectors often have a 5&nbsp;V pin that can be used.</p>\n\n<p>The pins that are limited to 40&nbsp;mA that you are thinking of are the digital pins, i.e. the pins that can be switched on/off by the microcontroller. These are actually more limited than this, and while in some cases drawing 40&nbsp;mA from them may be possible, it is not a good idea.</p>\n'}, {'answer_id': 13726, 'author': 'user77232', 'author_id': 12857, 'author_profile': 'https://3dprinting.stackexchange.com/users/12857', 'pm_score': 2, 'selected': False, 'text': '<p>Any 5&nbsp;V "output" on those main boards would be used to power a USB host. This is because the electronics actually runs on 3.3 volts. It would be better to splice the input power (the 12 to 24&nbsp;V) and use a buck converter to get down to your required 5&nbsp;V. Select the right one, and you can have all the current you need. </p>\n'}]
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