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Recent content by Vaughn

  1. V

    Rewinding permanent start capacitor motor

    I have a core/stamp from one of my cooler fan that is a permanent start capacitor single phase motor, I want to rewind it to get the maximum torque. I have winding wires with SWG #28 for main winding and #31 for aux winding, I am able choose any value of capacitor I don't find any formula to get...
  2. V

    How this SMPS works?

    And how the base of this NPN receives pulse and how the frequency or duty cycle of this MOSFET gets affected?
  3. V

    How this SMPS works?

    I tried to get the schematic from this SMPS Board and got this But I didn't understand the working of this schematic, I don't want to go too much deep.. (But It is also welcome) How these NPN and PNP transistors are configured to drive the Mosfet? How can one increase the power output...
  4. V

    [SOLVED] Generating compile time error in C

    I am using AVR Studio 5, don't exactly know which compiler is used in it.Actually I am passing a value to a function which I want to put it in a header file later. So for the reliability, I just wanted to put some error message there so that I could get any error or warning during compile time...
  5. V

    [SOLVED] Generating compile time error in C

    How can I evaluate any expression during compile time and generate compile time error in C? Say I have a function void foo(int number){ if(number < 10){ //Do this; } else #error "Number is greater than 9 and this is compiler generated error"; }
  6. V

    How to trim the tokens in Preprocessor directive in C?

    Normally we use "##" (token pasting operator) to concatenate the tokens in preprocessor directives like: #define SET_LOW(BIT) PORT(BIT ## _PORT) &= ~(1<<BIT) #define LED PC0 #define LED_PORT PORTC So my question is: Are there any method in C (especially in preprocessor directives) to...
  7. V

    Smashing/customizing footprint of a component in Eagle Layout

    Is it possible to smash down the footprint of any given component while working in the Eagle layout editor? I want to increase or decrease the distance between two footprint of a Resistor, can it be done without going through component library and by creating another package? Any trick are ULP...
  8. V

    [SOLVED] Increasing required current from MC34063

    This circuit is working fine, there is nothing wrong with the buck converter but the problem was with the way I was driving the LED and was assuming that it should draw 350mA @ 3V3 from this converter and this is where I was wrong. I reached to this conclusion by testing some other loads to it...
  9. V

    [SOLVED] Increasing required current from MC34063

    Suppose I don't add any resistor with LED in series then I should not worry about the voltage across it, if the current is 350mA in my case..?
  10. V

    [SOLVED] Increasing required current from MC34063

    Here I've attached the schematic and yhre board of my buck converter, which is using MC34063 Regulator IC to supply a 1W LED. I successfully managed to get the required voltage 3.3v but it is not sourcing the required current 350mA giving only 40mA, I am not able to figure this. Calculation for...
  11. V

    Turning off the signal to MCU at desired voltage level

    how can I implement this device when the MCU is already drawing 8uA in sleep mode and datasheet says LM809/10 sinks 15uA I can't provide it VCC from the battery because don't want the power consumption become more than it. and reset voltage is ~3.9V
  12. V

    Can Carbon Monoxide Sensor be used to measure CO's ppm in the Air

    **broken link removed** Your answer is very informative, I searched for Sensor and got two results. Both consists MQ7 and both have an analog output, one of them is only Sensor without any additional PCB and one have some circuit board along. Now my situation is I want to read the concentration...
  13. V

    Can Carbon Monoxide Sensor be used to measure CO's ppm in the Air

    I've never used any gas sensor before but I would like to try some experiment with Carbon Monoxide sensor and my doubt is, Can we used CO sensor to measure the quantity of CO in the free air in PPM or this sensor is only useful for checking the presence of CO in the air?
  14. V

    Understanding Key Debounce

    You are a genius the way you catch the zero and non-zero issue was superb. It was exactly why I was not putting the keyPressed() function inside the interrupt but your suggestion to use the ternary operator solved my this issue too. Now I am using this code inside ISR and all are working fine...
  15. V

    Understanding Key Debounce

    Thank you so much, Aussie Susan and AAP. Dear, Susan you explained very nicely, you solved all my problem. The code I wrote before had one more bug in it, I was needed to utilise that keyState before the 2ms else the keyState would be lost in next interrupt but keeping a flag can be used anytime...
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