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Recent content by Eshal

  1. E

    Shift Invariant and Shift Variant DTS

    :-? sorry.
  2. E

    Shift Invariant and Shift Variant DTS

    Hello to all experts. I understand how to check the DTS for shift variant and shift invariant. But I am confused with this example: Check for shift invariance for the below system. y(n) = x(-n) Attempted solution: shift the input by k samples gives y(n,k) = x(-n-k) now shifting the output...
  3. E

    Downsapling and Upsampling of the DTS

    Hello experts! I was studying Digital Signal Processing and got confused how the x(n) was downsampled to x(2n) i.e. by factor of 2. Here is the image of the original and downsampled signal. Kindly tell me how does x(2n) created from x(n) Also kindly tell me how to get the upsampled signal as...
  4. E

    Enabling or Disabling the pin in AT89C51 in C

    @pradhan.rachit heheheheheh.... I have also tried it already :) You know, in this case LED at P1.0 is always on. No matter what other conditions are. It will not go off in any condition.
  5. E

    Enabling or Disabling the pin in AT89C51 in C

    Ohh I see. And I have already tried with if((P2^1 == 0)&&(P2^0 == 0)) But yet result was same as I described above. When LDR is dark and button is pressed then the LED at P1.0 should glow. It means its cathode which is connected at pin P1.0 should at low when LDR is dark and button is pressed.
  6. E

    Enabling or Disabling the pin in AT89C51 in C

    @Pradhan.rachit Ohh yes, my bad. I could not figured out right syntax. :) Thanks. First of all, I am not a boy. I am a girl. So it should be like "Just polling for comparator outputs at the port. The button depicts the state of an IR LED as per her diagram." OK? And finally, I would like to...
  7. E

    Enabling or Disabling the pin in AT89C51 in C

    Yeah... I have already corrected it. But When I tried the code then I received two error. One was the closing bracket of main function. And other was about P2_1. Look at the picture. Can you rectify the mistake pradhan for me? First tell me this then I will ask further about the circuit. I...
  8. E

    Enabling or Disabling the pin in AT89C51 in C

    Sorry but I don't see any code. It is totally blank. I am online using mobile phone. On other threads I can see codes. But here I can't see any code. :-/ - - - Updated - - - @pradhan.rachit I am very much obliged to you for your kindness. I will first how did you do this. If I stuck then I...
  9. E

    Enabling or Disabling the pin in AT89C51 in C

    @ThirunavukkarasuThoondi I am using comparator so its mean my output of LDR is digital. @FvM and @pradhan.rachit Now you listen what is I want to do with my circuit. Here is the diagram below of my circuit. The output of comparator U2:A is the output of LDR. And the output of comparator U2:B...
  10. E

    Enabling or Disabling the pin in AT89C51 in C

    This is not the answer to my question. First read my post then reply. I am not asking for circuit designing. I am asking how to disable all other pins of 8051 until I get P2.0 to be equal 5V. I have connected 10K pull up resistor.
  11. E

    Enabling or Disabling the pin in AT89C51 in C

    Using comparator LM339. Well it doesn't matter which comparator I use. Just using comparator.
  12. E

    Enabling or Disabling the pin in AT89C51 in C

    Hello experts, My situation is, I have connected an LDR to the pin P2.0. And I want to disable all other pins of the controller until P2.0 gets equal to the 5V. Where, 5V=Vcc. How to do this using C language? Thank you very much.
  13. E

    Fundamental Period of the Signals

    Hi, I have two questions. 1) See the picture Here, in order to find fundamental period we divide the argument of the function by 2π. Like in (a)cos(0.01nπ) so the answer is f=0.01π/2π= then T=1/f=200. But in (c) cos(3πn) the answer is T=2. Why? because according to me it is should be T=3π/2π...
  14. E

    Op amps with feedback on both input terminal

    Positive feedback the biggest problem as all discussion says. However, I understand @Audioguru @FvM says.
  15. E

    Op amps with feedback on both input terminal

    I want to be the part of this discussion. As you all said, the schematic is drawn wrong. But I want to ask why? In post#5 of @AMS012, he has given link in which opamp has positive and negative feedback simultaneously. And @dann11's circuit has also both feedbacks simultaneously. The one which...
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