SIngle Push Button toggle

Question

On the face of it, when first told it looked a simple requirement : There is a single push - to - on hardware switch which is read by a DAQMX read function as a digital input inside of a 50ms timed loop.  Every time the user pushes the switch momentarily ( momentary can be anything from 100 to 500ms depending on the user's mood), I should toggle the state of a lamp - If its ON it must go OFF and if OFF must come ON.
Enclosing a small code ( in LV8.0) that attempts doing this and  is reasonably successful when the Timed Loop is set for a timing of 1000ms. But do it with 50ms timing ( which is what I want ) and you find getting the required state of the lamp is a challenge of reflexes !!
Yes I can solve the problem easily with a Event structure but the input comes from a field element - hardware switch. And the machine uses code written in LV7.1.
Any suggestions ? 
Raghunathan
LV2012 to Automate Hydraulic Test rigs.
Attachments:
PB_toogle.vi ‏84 KB

Answer 1

Sippy wrote:
Can we do the same thing using hex values. I mean
when 00011110 received I should get 11111110 ( if 7 Led are present in the front panel)
when I  send 00011110 again I should get 11111111 (Last bit toggled)
similarly , when i send 00011101  ---------->  11111101
               when I send 00011101 again -----> 11111101
               when i send 00011011  ---------->  11111011
               when I send 00011011 again -----> 11111011
               when i send 0001011  ---------->  11110111
               when I send 0001011 again -----> 11110111
               when i send 00001111 ---------->  11101111
               when I send 00001111 again -----> 11101111
And any of the bits should not change until I receive the same value again.  And I can send Randamly any of the bit low and corresponding to that my led in front panel should vary.
Plz help me in this.
Your description is ambiguous.  After thte word "similarly", The binary values on the right side do not change.  But in your first statement, the value changes.  It looks like you are wanting a 0 in any bit position meaning to toggle a certain LED.  Yet, your first three binary digits are always 0's and the right side shows no toggling.   You stated you had seven LEDs, but you are showing eight bits.  This is very confusing.  Assuming you had seven LEDs, is this what you want:
               Normal output  1111111
Send 1111110    Output  1111110  (toggles bit 0)
Send 1111111    Output  1111110  (stays the same)
Send 1111110    Output  1111111  (toggles bit 0)
Send 1111101    Output  1111101  (toggles bit 1)
Send 1111101    Output  1111111  (toggles bit 1)
Send 1111010   Outptut  1111010  (toggles bits 0 and 2)
Send 1111101   Outptut  1111000  (toggles bit 1 but leaves 0 and 2 alone)
Send 1111000   Output   1111111  (toggles bits 0,1,2)
In other words, a 0 in any position will toggle the corresponding LED.  Is  this what you want?
- tbob
Inventor of the WORM Global