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Multitouch Table FH Ingolstadt: Unterschied zwischen den Versionen
Multitouch Table FH Ingolstadt (Quelltext anzeigen)
Version vom 31. Juli 2011, 14:52 Uhr
, 31. Juli 2011→Suggestions for improvement
Cfr34x (Diskussion | Beiträge) (→Multitouch Poker: Text aus dem git eingefügt) |
Cfr34x (Diskussion | Beiträge) |
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==== Suggestions for improvement ====
===== A short explanation of how the circuit should work =====
The task of the circuit is changing the state of the output at rising edges of the VSYNC signal.
By doing that, the short pulses will change to a long square wave. So the IR-LEDs will turn on / off
just before the next image is tanken.
This corresponds the behavior of a T-flip-flop. This T-flip-flop was implemented by two JK-flip-flops and some inverters. The inverters were made from NAND-Gates.
===== The Problems =====
As the flashing mode has not yet been implemented in the tracker software, we took only a short test run.
It has been shown that the LEDs are flashing, but the picture sometimes is "cut".
This means that half of the image is illuminated, but not the other half.
It could not be determined whether the basic approach with the T-flip-flop is incorrect,
or the reactions of the circuit are too slow.
Furthermore:
If the installed NAND-gate is replaced by an identical, newer model, the circuit will not work anymore.
Apparently, the newer NAND-gates do not react quickly enough.
It must be clarified, if the basic procedure is correct. If so, the circuit must be optimized by:
* faster response to rising edges
* faster NAND gates, or changing to pure inverters.
=== LED Driver Board ===
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