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  • Users: bubulindo
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  1. bubulindo

    Timer2 in SAB80C535

    Hello, I would like to know if anyone has worked with the timer2 of the SAB80C535. I want it to work as a simple timer. But i can't seem to find the control bit to start counting or even the interrupt flag. Best regards, Carlos Cardoso
  2. bubulindo

    GCC compiler for 51 microcontrollers

    Hello, i would like to know if any of you know of any GCC compiler for 51 family of microcontrollers??' Best regards, Carlos Cardoso
  3. bubulindo

    .jed viewer for XP

    Hello, I would like to know if there is any program to view a file with a .jed extension. This type of files is used in programs for PAL's. Best regards, Carlos Cardoso
  4. bubulindo

    Analog to digital conversion with multiple channels

    Hello, Upfront i would like to tell that the Subject hasn't got much to do with my doubt. I'm using the SAB80C515 and i would like to know if it is possible to connect all the analog inputs of the A/D to the same point? Will it affect the accuracy of the readings?? Best regards, Carlos...
  5. bubulindo

    MsgBox in VB6

    Hello, I would like to know if it's possible to take off the alert sound that a msgbox makes in VB??? Best regards, Carlos Cardoso
  6. bubulindo

    reflective component

    I'm looking for a coating or a plastic tape that changes it's reflective properties if there is water behind her or not. The purpose is to detect the level of water in a glass container via a reflective infrared sensor. Can someone help me??? Best regards, Carlos Cardoso
  7. bubulindo

    Flow meter....

    Hello, I would like to know where can i find some information on flow meters for liquids's. Best regards, Carlos Cardoso
  8. bubulindo

    GigaOhm measurement

    Hello, i'm building a GigaOhm measuring device. I'm making a voltage divider with the GigaOhm resistance and a 68MOhm resistance and i apply that signal to a non-inverting amplifier with a gain of 40. My problem is that my signal takes too long to settle. How can i make it faster?? Best...
  9. bubulindo

    battery and wall cube adaptor device

    I'm planning on building a portable device powered by a battery, but i also want it to be possible to connect a wall cube adaptor to power my device. How can i do it without the need for a mechanical switch? Best regards, Carlos Cardoso Best regards, Carlos Cardoso
  10. bubulindo

    PDA programming...

    Hello, i'm new to pocket pc's and i would like to know how to develop software for these devices? I use VBasic in my pc applications and therefore, if this language could be supported in PDA devices it would be great. I would like to know any sites where i can gather moere info about this...
  11. bubulindo

    Battery charging IC's???

    Hello, I'm looking for an IC that can charge 4 AA batteries and also provide power for the circuit connected to those batteries. Can someone help me??? Best regards, Carlos Cardoso
  12. bubulindo

    How can i make an amp op response faster??

    How can i make an amp op response faster?? Hi, i'm using an amp-op to measure a resistance of 120GOhm, yes that's correct, and my amp-op takes about 2,5 seconds to settle the signal. How can i make it faster? best regards, Carlos Best regards, Carlos Cardoso
  13. bubulindo

    system identification

    Hello, I would like to know where can i find information on dinamical systems identification, like websites or books. Best regards, Carlos Cardoso Best regards, Carlos Cardoso
  14. bubulindo

    FIR filter

    Hello, i need to design a filter to "clean" the signal i'm feeding to my A/D converter from 50Hz noise. I would like to know how can i calculate the coefficients to do this. Best regards, Carlos Cardoso Best regards, Carlos Cardoso
  15. bubulindo

    water level...

    Hello, I need a cheap way to measure the water level in a glass container without inserting any type of component's or metal in the water. Can someone help me??? Best regards, Carlos Cardoso
  16. bubulindo

    230Vac to 12 Vdc???

    I need to convert 230Vac to 12 Vdc using the minimum material possible, which means no transformer. The rectification of the 230V wave doesn't have to be perfect because i will need the 12V to connect a relay and a CD4013 flip flop. Best regards, Carlos Cardoso
  17. bubulindo

    mathematical model for a PID controller

    Hello, I'm building a temperature control for a coffee machine and i would like to know if it is possible to make a digital PID or PI controller for it without having the mathematical model of the water boiler. And if it's not possible, how to get the transfer function of the water boiler.
  18. bubulindo

    one pulse switch...

    I need to build a one pulse switch, that is, i need to turn on and off relay with a pulse button. Basically it's this that i need. _ _ Button ___| |_________| |__ _____________ relay ___| |___ reply to ee01013@fe.up.pt
  19. bubulindo

    I want to make a 9 Volt NiMH battery charger, can someone help me

    Hello, I want to make a portable battery charger for 9Volt NiMH batteries, but i don't know where to start or even what chip to use. Thanks for any help

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