Frequency changes on BS2px

merlin

I have experimented some problems changing the speed and frequency of my old BS2 programs in order to adapt them to my new BS2 px.

The thumb rule has guided me is:
"Multiply speed sentences by 2.3 and divide frequency sentences by 2.3"

All my sentences had work very well except in the case of SSIR sensor module, which Parallax has discontinued. SSIR manual suggest for BS2
FREQOUT 0,1,38500 .sends out signal to IR LED
which it has to be transformed into
FREQOUT 0,2,16740
Unfortunately, the frequency causes no response from the detector. In fact, with trial and error I have found that the 5,800 - 7,200 should be a suitable working range.
But the sensitivity of the detector is hardly affected by the correct frequency chosen, so I was wondering if Parallax has made the test to find the optimal frequency for an SSIR module working with a BS2px.
Any suggest?
Thanks and best regards

merlin


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Mike Green

Please look at the comparison sheet between the BS2px and the other BS2 devices <http://www.parallax.com/dl/docs/prod/stamps/BASICStamp2px.pdf>. It gives the conversion factors between the BS2px and the other BS2 devices. FREQOUT is quite different from what you assume. The two frequencies are in a ratio of 1:6.03, not 2.3 and the durations are 1:0.166 for BS2:BS2px.