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Recent content by maniac84

  1. M

    About PIC18F25K22 CCP function.

    Thanks for the opinion sir. Yup. I have configure my device timer so that it can work for the CCP. But when I compare with the actual interval time I get from my stop watch, seems like the interval time I get from the PIC will be around 0.8 sec slower. How do we make the time from the PIC accurate?
  2. M

    About PIC18F25K22 CCP function.

    Hi guys, From the datasheet of the PIC18F25K22, we know that this mcu have the CCP function which we can capture and record the interval time between two signal from the same input. I want to use the CCPR4 to record the time. May I know what is the maximum time interval I can get using this CCP...
  3. M

    Multiple voltage to microcontroller design.

    Instead of 3 opto-isolator circuits, is there a possibilities that we can build one opto-isolator circuit to be able to accept a wide range of input voltage like for my case say from 5V to 24V? Like this I can save more space.
  4. M

    Multiple voltage to microcontroller design.

    So, what you mean is we cannot straightaway connect the PLD signal (for my case: 24Vdc, 12Vdc or 5Vdc) to the opto-isolator? Is it that we have to scale the PLD signal to 1.8Vdc before inputting to the opto-isolator? Is it by using resistors to scale it like we talk before at the beginning of...
  5. M

    Multiple voltage to microcontroller design.

    Thanks for the comment. Back to the DC type of voltage from the PLC. Assume the PLC produce 0V as low voltage. May I ask, can we straightaway use a opto-coupler or opto-isolator? Opto-coupler or opto-isolator can also accept input of higher voltage (for my case 24V and 12V) and output with lower...
  6. M

    Multiple voltage to microcontroller design.

    Ok thanks. Let's talk about AC signal. If the PLC is coming out with an AC 100v signal, how do we convert to 5vDC so that my pic can detect it?
  7. M

    Multiple voltage to microcontroller design.

    From u guys opinions, is it that I have to build 3 circuits to detect the signal for different PLC? One circuit for PLC with 5v signal,one circuit for PLC with 12v signal and one for PLC with 24v dignal.
  8. M

    Multiple voltage to microcontroller design.

    I see. Thanks! Then do we need to scale down again to 5v using divider after the comparator? Or the comparator Wil straightaway produce a 5v for high to my pic?
  9. M

    Multiple voltage to microcontroller design.

    Great example! Now I understand.. thanks! - - - Updated - - - U mentioned comparator can be programmed? Programmed by what? The PLC or my pic? Can explain more? How do we build a comparator? Is it by external components? Or we programmed it?
  10. M

    Multiple voltage to microcontroller design.

    What do u mean by Low voltage? Can explain more?
  11. M

    Multiple voltage to microcontroller design.

    Hi guys, I want to build a circuit of production counter display where when there is an output from a machine, it Wil produce a count signal n my display Wil start increment one. The machines are using PLC and different machine will produce different voltage of count signal. Some are 5vdc...
  12. M

    Question on logical equation on my C programming.

    My ADC only support up to 3 decimal point... So, I'll get lots of 9 behind.. =(
  13. M

    Question on logical equation on my C programming.

    I see. But is it the most suitable solution? My display value will get lots of 9.
  14. M

    Question on logical equation on my C programming.

    Nope. If input is 10V, the display will be showing 999999 which is the max value of the particle count. All round number. No decimal point.
  15. M

    Question on logical equation on my C programming.

    Hi guys, I have a situation on my C programming here and just wondering whether my solution is the correct way: I have a LED display with particle count sensor and will show 6 digit of seven segment numbers as the count value. The sensor will give voltage input value. The input is from 0V to...

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