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Recent content by madhuvariar

  1. M

    [SOLVED] PIC16F887 TQFP, ADC_Read() makes 5V spike on i/p (same code works fine on DIP Packag)

    Hi, Thank you very much for the suggestions. The problem was exactly as what you told. One of the ADC pin( assigned as digital i/p,, not as adc ) has 0.7V more than the Vcc. When i removed that connection everything became alright Once again Thank you very much for the much needed Help. madhu
  2. M

    Three Phase BLDC motor H Bridge Circuit using mosfets

    Hi 1. You can select MOSFETs according to the voltage & current ratings, Also consider the Rds(ON) .. use least RDS(on) MOSFET so that heating will be less. 2. You can use N channel mosfets at High side , but to drive high side gate you have to use boot-strapping or separate isolated power...
  3. M

    How to program pic 16f877a microcontroller with c programming using mplab

    How do I create a new project in MPLAB IDE which uses a HI-TECH C compiler? The easiest way to create a new project in MPLAB IDE is to use the Project Wizard selectable from the Project menu. HI-TECH Software Frequently Asked Questions Make sure you select the HI-TECH Universal toolsuite...
  4. M

    Beginner Microcontrollers

    You can use PIC microcontroller and easy to use compiler from Mikroe PIC Compilers - mikroElektronika The book you can refer is Chapter 1: World of Microcontrollers - Book: PIC Microcontrollers - Programming in C Really good book with a lot of graphic representations
  5. M

    [SOLVED] PIC16F887 TQFP, ADC_Read() makes 5V spike on i/p (same code works fine on DIP Packag)

    PIC 16F887 TQFP 44-pin package ADC problem. As i have been working with the PIC 16F887 TQFP package we encountered the following problem with ADC and concluded the following results: 1. We infer that the ADC channel assigned while reading goes high (@5V) and remains high until the ADC channel...
  6. M

    inverter circuit diagram

    circuit diagram for inverter visit microchip "reference design 2" on www.microchip.com its a valuable one. itis giving the circuit diagram and full code
  7. M

    Display line voltage on 7-segment display

    voltage for 7 segment display
  8. M

    help me to solve restaring of system

    u are using the differance of timer1 values between two consecutive interrupts.. what will happen if ac has failed (no interrupt has come) for next 10 or 20ms.. u have to add a timer here and do the change over from ac mains mode to inverter mode if the interrupt has not come for the specified...
  9. M

    i need help in doing UPS project

    Hello please , produce a 100Hz square wave from ac mains supply( after full wave rectifiaction of 50Hz sine wave) . and feed to PIC. if it is absent u can sense that the ac mains is failed
  10. M

    cadsoft eagle PCB How to assign a pad size

    i need a drill size of 1mm and , the board is single sided, then what should be the minimum pad

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