# Particle core 5v out available from Vin pin when connected to USB

**URL:** <https://community.particle.io/t/particle-core-5v-out-available-from-vin-pin-when-connected-to-usb/33999>\
**Category:** General\
**Created:** [June 24, 2017, 2:14pm UTC](https://community.particle.io/t/particle-core-5v-out-available-from-vin-pin-when-connected-to-usb/33999 "2017-06-24T14:14:14Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![tableland](https://avatars.discourse-cdn.com/v4/letter/t/ee59a6/32.png) [@tableland](https://community.particle.io/u/tableland)\
**Post date:** [June 24, 2017, 2:14pm UTC](https://community.particle.io/t/particle-core-5v-out-available-from-vin-pin-when-connected-to-usb/33999/1 "2017-06-24T14:14:14Z")

</div>

Sorry if that me appear a bit vague, but while testing on a breadboard i found out that 5v is available on the V in pin when powered from a PC via USB.

I have been using this to power some extra circuitry that needs 5v, there is enough current available to power a 16 by 2 line I2C LCD with backlight.

Is this okay to use for experimental use, much simpler than separate supply when interfacing to other hardware. I have been running multiple examples from some previous Arduino code and hardware, porting them across with a lot of help from the Forum using code snippets that people post.

I can now get a few sensor devices running on the core, such as a mpu 9250, ( sending Pitch/ Roll ), a Sharp dust sensor, sending data to a connected LCD, and also got a ST7735 colour graphics LCD working, receiving text & sensor values. this is all thanks to the forum members who are very helpful and willing to share their knowledge, so thanks to all of the contributors to the forum.

i am happy to provide whatever code i have up to now if anyone wants it, but i am very new to this type of forum, so not sure how to post any example code, but will try if anyone interested.

TOM.

---

<div class="post-metadata">

**Author:** ![kennethlimcp](https://avatars.discourse-cdn.com/v4/letter/k/c0e974/32.png) [@kennethlimcp](https://community.particle.io/u/kennethlimcp)\
**Post date:** [June 24, 2017, 2:19pm UTC](https://community.particle.io/t/particle-core-5v-out-available-from-vin-pin-when-connected-to-usb/33999/2 "2017-06-24T14:19:20Z")

</div>

You can use it as long as you are not drawing excessive current from the Core.

The limitation is the diode that goes between Vusb and Vin.