rfid2ln & rfid2wifi interfaces

vikr
Posts: 578
Joined: 20.05.2012, 09:53

Re: rfid2ln & rfid2wifi interfaces

Post by vikr » 08.09.2016, 16:48

Dagnall wrote: With the reader just above the track, and the top of the tag at about track height, have measured a static a "longitudinal" range of about 35mm along the track where the reader can read the tag.
so I do!
Dagnall wrote: My test tram is not fast, so the 25ms RFID read speed is adequate for this application. For faster trains it may not be fast enough..
How fast should the tram run? In which scale?
Dagnall wrote: I calculate that this translates to circa 1.2 M/s maximum train speed before tags can be missed.
For H0 this is proportional to about 375 km/h! :?

Regards

vik

Liviu M
Posts: 949
Joined: 03.12.2011, 20:44

Re: rfid2ln & rfid2wifi interfaces

Post by Liviu M » 08.09.2016, 17:23

Hi Dagnall,
Dagnall wrote:and a "serial.print (micros()-start)" where I want to see the time..
Thanks!
I've used this method myself, but somehow I forgot it when I've asked.

Cheers,
Liviu

Dagnall
Posts: 278
Joined: 15.05.2015, 14:41

Re: rfid2ln & rfid2wifi interfaces

Post by Dagnall » 08.09.2016, 18:19

vikr wrote: For H0 this is proportional to about 375 km/h! :?
but my garden rail is G gauge, so 1/32, or 1/20 depending on what I am "modelling" so about 140 or 90 km/h , so the response time should be just about ok..
Thanks for making me look at this.. ! I should have done that calculation before! :beer:

Dagnall

vikr
Posts: 578
Joined: 20.05.2012, 09:53

Re: rfid2ln & rfid2wifi interfaces

Post by vikr » 08.09.2016, 22:28

Hallo Dagnall,
Dagnall wrote: Thanks for making me look at this.. ! I should have done that calculation before! :beer:
Never mind, i'am sure, - after having some beers - wouldn't feel very comfortable in a garden where a G-Lok comes suddenly with 1,2 m/s round the corner... :D

Regards

vik

Liviu M
Posts: 949
Joined: 03.12.2011, 20:44

Re: rfid2ln & rfid2wifi interfaces

Post by Liviu M » 09.09.2016, 06:11

Hi Vik,
vikr wrote:after having some beers
don't drink and drive!
:mrgreen:

Liviu

Dagnall
Posts: 278
Joined: 15.05.2015, 14:41

Re: rfid2ln & rfid2wifi interfaces

Post by Dagnall » 11.09.2016, 20:33

Quick update, I double checked the loop time with SPI clock at 10MHz, by setting / resetting an output and using an oscilloscope, and I now think it's nearer 12ms ! So perhaps a fast train might be possible!
But no beers for the driver at that speed! :lol:
Still some bugs to sort out in the code, but it's getting more reliable.
D

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