MaxSonar Ultrasonic Pole/Tower Sensing & Detection Application Note!

[Joe Ross]

Originally Posted by calica

You need to set it as a output to send the initial pulse. Then as an input to let the pulse "loop back around" from the last MaxSonar.

I was a little worried about Java not GC'ing the DigitalOutput object fast enough. But it looks like using DigitalModule.*DIO() should allow the control needed.

Besides the programing language time, the NI 9403 can have up to an 18 us delay in switching directions.

[computerish]

Has anyone actually gotten these working with the daisy chaining? We wired up two LV-MaxSonar-EZ4s for daisy chaining and we can get it working on a breadboard.

Unfortunately, we can't figure out how to reconfigure a digital i/o pin as an input once it is configured as an output. We are getting an AllocateException. We are using Java. Any ideas?

[computerish]

We found the solution:

DigitalModule dm = DigitalModule.getInstance();
dm.freeDIO(pin number);

[Team0865]

Will using an XL-MaxSonar-EZ0 work just as well as XL-MaxSonar-EZ0? I've looked at the schematic for the daisy chain and I was wondering where each of the wires get wired back to on the digital side car. Our team has limited electronic experience so any additional help would be great.

Thanks,
Team 0865

[Jon236]

We use the MaxSonar modules in the analog mode. They return a value every 99 ms and work very well for us.