C3S: Add analog switch to OPD_SDA and OPD_SCL lines on C3 surrogate

oresat / oresat-flatsat

All things for the OreSat flatsat

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C3S: Add analog switch to OPD_SDA and OPD_SCL lines on C3 surrogate #2

Open cesarordaz opened 3 years ago

andrewgreenberg commented 2 years ago

In particular, use a "power-off safe" analog switch (see UART lines on Battery v3) so that the Trinket can be powered off and it doesn't kill the I2C lines.