SIM MOTOR Encoders?

[GeeTwo]

Also, for a lot of neat info about sensors in general, with info on encoders, see this thread started today.

[Bluejackets]

We appreciate all your time and help! Have a great holiday season and go teams!

[GeeTwo]

SHAZAM! There are now CIM motor encoders available on AndyMark. You may have difficulties finding gearboxes that can engage the CIM through this "spacer". Those mounting CIMs and minCIMs to Versaplanetaries were complaining about too-long shafts, so perhaps these encoders could kill two birds with one stone in that application.

[rsisk]

Originally Posted by GeeTwo

SHAZAM! There are now CIM motor encoders available on AndyMark. ...[snip]

Pull up resistors are necessary to generate an output signal for the desired voltage level

For us folks lacking such electrical knowledge, could someone comment on what this means? I checked the spec sheet, but it was not much help.

[marshall]

Originally Posted by rsisk

For us folks lacking such electrical knowledge, could someone comment on what this means? I checked the spec sheet, but it was not much help.

You need to connect resistors (would go with 10k) between the quadrature lines and the +5v rail. This will pull the signal to high when not being actively pulled low by the encoder. If you don't do this then you're going to get some noise.

EDIT: Section 1.4.3 of the Talon SRX User Guide has a diagram: http://www.ctr-electronics.com/Talon%20SRX%20User's%20Guide.pdf

Thanks Omar!

[GeeTwo]

Originally Posted by rsisk

For us folks lacking such electrical knowledge, could someone comment on what this means? I checked the spec sheet, but it was not much help.

On the specifications sheet, at the bottom left on page 2 is a schematic showing how to wire these resistors. The sentence simply means that these resistors and the connection of them to supply voltage is not done internally to the encoder. This means that if you don't use pull up resistors, when the output signal is supposed to be high, it will instead be open (connected to nothing).

If you connect this encoder to two of the DIO ports on the RoboRIO, this will not be necessary as those pull up resistors are implemented inside the RIO. I haven't checked the internal wiring of the various motor controllers which support encoders (Jaguar, SRX) to see if they have this resistor internally or not; from the comment, I suspect that at least one of them does not.