Tachometer Interrupt Help

[twiggzee]

Originally Posted by loafdog

twiggzee, have you tried different speeds when running your device/tach? We found that until our shooter reached a certain speed getPeriod returned infinity. We also used setMaxPeriod to adjust the period so that we could measure shooter revolutions at the lowest speed we would ever use.
I didn't see a way to find out what the original max period value was, either by calling a function or looking at wpilib src code.

-Maciej

that was it. tried it again, turns out that the getPeriod method only consistently gives a reading when our wheel is spinning more than 1200 rpm. anything below that we get either an "infinity" reading or an occasional reading when approaching 1200 rpm. thanks!

[Ether]

Originally Posted by twiggzee

that was it. tried it again, turns out that the getPeriod method only consistently gives a reading when our wheel is spinning more than 1200 rpm. anything below that we get either an "infinity" reading or an occasional reading when approaching 1200 rpm. thanks!

Maybe Java has a "SetMaxPeriod" like C++ does:

/**
* Set the maximum period where the device is still considered "moving".
* Sets the maximum period where the device is considered moving. This value is used to determine
* the "stopped" state of the counter using the GetStopped method.
* @param maxPeriod The maximum period where the counted device is considered moving in
* seconds.
*/
void Counter::SetMaxPeriod(double maxPeriod)