# 3.3V and 5V

**URL:** <https://community.sparkfun.com/t/3-3v-and-5v/37078>\
**Category:** Bluetooth\
**Created:** [June 13, 2019, 3:28pm UTC](https://community.sparkfun.com/t/3-3v-and-5v/37078 "2019-06-13T15:28:58Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![yeow](https://avatars.discourse-cdn.com/v4/letter/y/f19dbf/32.png) [@yeow](https://community.sparkfun.com/u/yeow)\
**Post date:** [June 13, 2019, 3:28pm UTC](https://community.sparkfun.com/t/3-3v-and-5v/37078/1 "2019-06-13T15:28:58Z")

</div>

Hi,

Am interested of getting a few SparkFun Pro nRF52840 Mini to build a mesh network of sensors for transferring data such humidity, temperature and Heart Rate. Seek your help to find in your inventory whether is there a mini size microcontroller which able to supply both 3.3v and 5v for these sensors, pls.

Rgds

---

<div class="post-metadata">

**Author:** ![TS-Chris](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-chris/32/6057_2.png) [@TS-Chris](https://community.sparkfun.com/u/TS-Chris)\
**Post date:** [June 13, 2019, 5:28pm UTC](https://community.sparkfun.com/t/3-3v-and-5v/37078/2 "2019-06-13T17:28:10Z")

</div>

The SparkFun Pro nRF52840 Mini only supplies 3.3 volts, but if you have it connected to USB, 5 volts is available on the VIN pin. If you’re not connected to USB, you’d need an additional 5 volt power source.