Notecarrier B 3.1 provides less power on VIO

Hardware Notecarrier B
1

Hi,

In GitHub - gauteh/sfy: 馃寠 A lightweight wave buoy for near-shore deployments. 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 路 Issue #169 路 gauteh/sfy 路 GitHub

Best regards, Gaute

2

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

3

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?

4

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