# Notecarrier B 3.1 provides less power on VIO

**URL:** <https://discuss.blues.com/t/notecarrier-b-3-1-provides-less-power-on-vio/2322>\
**Category:** Notecarrier B\
**Created:** [September 10, 2024, 8:03am UTC](https://discuss.blues.com/t/notecarrier-b-3-1-provides-less-power-on-vio/2322 "2024-09-10T08:03:20Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![gauteh](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/gauteh/32/269_2.png) [@gauteh](https://discuss.blues.com/u/gauteh)\
**Post date:** [September 10, 2024, 8:03am UTC](https://discuss.blues.com/t/notecarrier-b-3-1-provides-less-power-on-vio/2322/1 "2024-09-10T08:03:21Z")

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Hi,

In [GitHub - gauteh/sfy: 🌊 A lightweight wave buoy for near-shore deployments.](https://github.com/gauteh/sfy) we have been using VIO to power the MCU, IMU and SD-card. With version 3.1 of Notecarrier B we are seeing issues with I2C communication, usually a sign of insufficient voltage. With v2 everything appears to be in order. What has changed?

ref: [Notecarrier B v3.1 may have worse power supply · Issue #169 · gauteh/sfy · GitHub](https://github.com/gauteh/sfy/issues/169)

Best regards, Gaute

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**Author:** ![gauteh](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/gauteh/32/269_2.png) [@gauteh](https://discuss.blues.com/u/gauteh)\
**Post date:** [September 10, 2024, 9:33am UTC](https://discuss.blues.com/t/notecarrier-b-3-1-provides-less-power-on-vio/2322/2 "2024-09-10T09:33:18Z")

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I think it is version 2 of the notecarrier B that is confirmed to be working (not 3.0 as I initially wrote).

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**Author:** ![gauteh](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/gauteh/32/269_2.png) [@gauteh](https://discuss.blues.com/u/gauteh)\
**Post date:** [September 10, 2024, 2:02pm UTC](https://discuss.blues.com/t/notecarrier-b-3-1-provides-less-power-on-vio/2322/3 "2024-09-10T14:02:45Z")

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This now appears to maybe be an RF interference issue: we turned down the I2C speed on our additional IMU to 100 kHz and the problems goes away. Could the new notecarrier B induce more RF noise in the nearby circuits?

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**Author:** ![RobLauer](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/roblauer/32/1567_2.png) [@RobLauer](https://discuss.blues.com/u/RobLauer)\
**Post date:** [September 16, 2024, 7:00pm UTC](https://discuss.blues.com/t/notecarrier-b-3-1-provides-less-power-on-vio/2322/4 "2024-09-16T19:00:25Z")

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Hi @gauteh,

This one has us stumped right now as there is nothing operating on either revision of the Notecarrier B at RF levels. The only RF is on the Notecard and that terminates at the u.FL connector. Will let you know if/when we come up with another idea!

Rob