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Re: 3V3 digital signal to the cRIO
You actually DO NOT want to directly connect a pin on the Pi to a pin on the Sidecar. The sidecar has an internal pullup to 5V in it. Putting that 5V to the Pi could destroy the Pi. Either a Pull down, voltage divider, or logic converter would be needed in order to protect the Pi. The CRIO can take up to i think 24v on an input, so no need to worry about damaging the CRIO at the levels you are using.
That 5V comes from the Sidecar even if it is set as an input, so it needs to be worked out even if the CRIO is set as input.
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All statements made are my own and not the feelings of any of my affiliated teams.
Teams 1510 and 2898 - Student 2010-2012
Team 4488 - Mentor 2013-2016
Co-developer of RobotDotNet, a .NET port of the WPILib.
Last edited by Thad House : 27-12-2013 at 17:25.
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any robot that can hold and transport its team has found its purpose and can be considered complete - Nitroxextreme [more] 
27-12-2013, 17:23
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