/products/raspberry-pi/b/blog/posts/raspberry-pi-usb-output-powerI was recently surprised by a characteristic of the RPi 3B&#39;s USB Output ports. I don&#39;t usually monitor the voltage at the USB port, but I was trying a new setup with an Arduino Uno connected via USB while running Windows 10 IoT Core on a headle...en-USTelligent Community 12https://community.element14.com/products/raspberry-pi/b/blog/posts/raspberry-pi-usb-output-powerSat, 02 Mar 2019 23:44:10 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:3de72b53-1c28-4eb6-802c-fa874f5313d7mp21001<p>That sounds like strange behavior.&nbsp; I just now tried it with a model 3 B+ with Raspbian.</p><p>&nbsp;</p><p>When the 4 color rainbow displays: 5.2 v at USB port</p><p>Briefly, less than 1 second, as it transitions from rainbow to text boot messages: 0 vdc at USB port</p><p>Text boot messages: 5.2 vdc at USB port.</p><p>After that, always 5.2 volts</p><img src="https://community.element14.com/aggbug?PostID=6583&AppID=86&AppType=Weblog&ContentType=0" width="1" height="1">