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  1. S

    USB (HID) communication problem b/w pic18f4550 and PC

    what is the HID device you want to get detected as?? did u load all the necessary files? Or may be to check the communication first, you should try mounting the HID codes from microchip applications library.
  2. S

    smps gives no output

    Its difficult to measure using a multimeter, since transformer will be operating at very high frequency, and I'm not sure if multimeter can read at that high frequency. A better way to read will be on an oscilloscope.
  3. S

    Currenr Sensor Help for energy metering.

    For that 1800 turns you can choose the finest available copper wire, since your current will be very less. You can maybe go for 42-43 AWG. And yeah FvM's suggestion is much better
  4. S

    mini project using PLC

    It will be better if you put your targets as well, that will give a better insight into the project
  5. S

    indoor navigation system for blind person

    you can use a sensor network including distance sensor, IR sensors, etc to come up with a solution, otherwise you can use a kinect and develop your environment around it. For a better performance, you can create a 3d visualisation and accordingly feed commands to the user to take directions...
  6. S

    Any ways to shorten simulation time

    Which software are you using for simulation?
  7. S

    Currenr Sensor Help for energy metering.

    you can just wind copper wire around a core, you'll need to do some trials but its pretty easy to accomplish.
  8. S

    Device to act as 0 - 9V source

    Hi barry!! sorry to misread you, I was thinking something else. BTW for Pot based circuit, I think your device will turn up more into a device dependent voltage as well, since your device impedance will matter a lot when you are setting a voltage. I would still go on with a buck converter...
  9. S

    serial transmission from several digital sensors

    I just read a lot of quite complex ideas. I think I can suggest a simple one. why dont you use a 16:1 mux?? you will surely need 4 control lines, but that can be on board. You just need to create some gap at the beginning and ending to signify the start and end of the reading. Apart from that...
  10. S

    Device to act as 0 - 9V source

    I agree with barry!! If not a good idea to use potential divider. But I'll correct him here, this potential divider will work if your load is having low impedance than the potentiometer, otherwise most of the energy will flow through the potentiometer resistor and that would be waste of energy...
  11. S

    Current sense coil number 2...

    Yup it will. But it depends on coupling factor as well. Generally for current sense, primary conductor is also wound for a single turn over the coil to give a better coupling factor.
  12. S

    Need help with PIC16F877A Interrupt Code

    I would say you need to rethink your logic. A few suggestions : use switch statement outside your if(count_in ==1) and use this block only to update the value of count.
  13. S

    Need help with PIC16F877A Interrupt Code

    check jayanth's 2nd post again, your answer lies there
  14. S

    [SOLVED] Split 2 Difference Voltage

    with proper placement of diodes it should work, basically thats what is done in UPS and other power backup systems
  15. S

    Need help with PIC16F877A Interrupt Code

    you are getting an auto increment B'coz once you get into the while loop (first while after checking the button ==1), you never go back to check it again, and you are stuck in infinite loop. Count++ does its work at every cycle and you find that system is auto incrementing. Moreover to check...
  16. S

    reading ac voltage through microcontroller pic16f887 for stabilizer

    you can use a sine wave mapping for your case, but I feel like thats going to take more number of instruction cycles on your controller. I think you should check how these SMPS controller ICs work. That will give you a very good idea about the implementation. They use a threshold voltage and a...
  17. S

    How can I set AM PM on DS1307 ?

    https://forums.adafruit.com/viewtopic.php?f=41&t=18784
  18. S

    to decide fuse rating of a device????please guide

    I've not known any hard and fast rule for deciding the fuse rating, generally I do it with experience. So for maximum current of 2A, I would have used a fuse of 2.5 to 3 A rating. I generally take it as 1.5 to 2 times of the maximum current, but at times people use even 4-5 times of maximum rating.
  19. S

    eagle replace object help

    Standard practice will be just to change the package, But to answer your question, you can open the library from where you picked your part ad select which pins to hide and which to show
  20. S

    Boost converter VOltage out dropping slowly

    Circuit diagram of your converter will be required to debug the issue

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