On 09/20/2016 11:59 AM, Sarah Armstrong wrote: > Guy's > i'm looking at my renishaw probes , i'm not sure if i am seeing this > correctly > but apart from decoding the stream , i'm seeing when not touching the > probe emits a signal at about 150khz. When it senses touch it goes up to > 160khz. > but at the moment i'm not sure , as the only ir detectors i have works at > 38k > When I first started analyzing the Blum probe, I just put a photodiode right next to the emitter LEDs on the probe, and pulled it to +5V with a 1K resistor or thereabouts. It was very clear what was happening with a scope. The Blum sends a single serial byte at about 60 Hz, and then sends a byte whenever the probe status changes. One bit flips to indicate the probe deflection.
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Most of the IR receivers are set for 38 KHz, but the QSE159 does not have a bandpass filter, and has very fast response. I do see some variation in the width of the bits as distance is varied, but it works fine over the range I expect to be using. Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
