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Recent content by raf23

  1. R

    Converting an ADC value to Equivalent Process value?

    I'm working on a humidity controller which also controls the temperature inside a chamber.I'm done with the hardware (though i'm not the one behind the design)and which was originally designed with a 12 bit external ADC and an 89s52 uc and I replaced both with PIC 16F877A uc and I use the 10 bit...
  2. R

    TRIAC switching problem

    I have a speed control circuit for a 230v ac motor. It has got BTA 16 Triac for pahse control and it is driven by an optocoupler moc3021 and the trigger signal is coming from a pic16f676 mc. Trigger signal is given according to an input event to the micro controller. The problem is Traic is...
  3. R

    AC motor Low RPM problem

    I'm working on a controller for ac induction motor and it's spec is given below. I could control the speed without any trouble at higher speeds like 2000 rpm and above. I'm using TRIAC phase angle control topology in the controller. But at lower RPM like below 1000 RPM but motor takes so much...
  4. R

    Need help with a schematic

    Thanks for your concern Brian..But I never thought of giving 230v where 16-0-16 is using. what I meant is that 16-0-16 is derived from the 230v line and 230v is going to the triac part . Please have a look at the image attached
  5. R

    Need help with a schematic

    Thanks Brian.. I'm using it for controlling triac... actually this hardware works fine in the existing i just want to experiment with the software where pic micro controller is used to fire the triac...AC that comes to traic portion is not 16-0-16 its 230v/50Hz. so would this be a problem ?
  6. R

    Need help with a schematic

    Thanks ..how much error will come into it if i take any edge for zero crossing>
  7. R

    Need help with a schematic

    Hi I have a circuit diagram which i believe is for a zero crossing detection. if it is of zero cross detection ,can any one tell whether it is VZC or CZC ? Also it would be helpful if someone can tell the waveform at the collector pin of transistor with respect to ac waveform. ckt diagram is...
  8. R

    timer 1 usage in pic16f877a

    Hello I have got a situation where I'm forced to use timer 1 to generate interrupt at lower time limits like 256 us. Being a 16 bit timer ,Is there anyway that i could use it as 8 bit timer or more specifically to generate interrupt after 256 Instruction cycles ? Any help would be...
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