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Recent content by eiphan

  1. E

    [SOLVED] switching regulator in battery applications

    there are some low voltage MCU you can consider from TI or renesas so that you won't need regulator.
  2. E

    TRIAC Based Light Dimmer

    Yeah I think most likely temperature.
  3. E

    optocoupler for h-bridge

    You can use HCPL-3120. It is gate drive opto-coupler.
  4. E

    FPGA recommendation for small projects use

    You can you altera DE0 Nano FPGA board.
  5. E

    Protect Mosfet in inverter circuit

    Perhaps considering zener for simple. But yes, if you have shown circuit, it would be better.
  6. E

    Power Supply for 50volt and 3Amps

    Do you want DC or AC quantity from 230V? Another question is what do you want to regulate? Obviously, you can not regulate voltage and current at the same time. I assume you want to output 50V DC output with 3A current rating. Then how about using simple rectifier with transformer? Isn't it helpful?
  7. E

    Problems with DC/DC converters in isolated H-Bridge design

    Yes this device is fragile. Sometimes, you can't see output if you do not connect to the load.
  8. E

    PIC18F4520 LCD problem

    Thank you jaya. But it does not work either.
  9. E

    PIC18F4520 LCD problem

    Thank you for your suggestion. but I can see display when PICkit2 is just flashed and connected. But if I take out PICkit2 and reconnect again. LED blinking is working but not LCD. My suspect is config or PORTD.
  10. E

    PIC18F4520 LCD problem

    Hi the code is still messy as follow: #include<P18F4520.h> #pragma config OSC = HS #pragma config WDT=OFF, LVP=OFF, MCLRE = OFF #define RS PORTDbits.RD4 #define E PORTDbits.RD5 #define LCDdata PORTD char msg[] = "Hello"; void DelayFor18TCY( void ) { Delay10TCYx(2); // 5us delay...
  11. E

    PIC18F4520 LCD problem

    Hi I have problem in PIC18F4520 lcd DISPLAY. (1) The physical set up with PCI18F4520 and LCD is using PORTDbits.RD4 and RD5 as RS and Enable. RW pin is connected to ground. (2) I use MPLAB V8.9 and C18 compiler. 4-bit mode LCD data using PORTD. (3) The problem is I use PICkit2 to program and...
  12. E

    how to initialize PORT A of 18F4520 as input

    what I mean is (0&&0&&0 => 0) , (0||0||0 => 0)...
  13. E

    how to initialize PORT A of 18F4520 as input

    AND and OR are of course different. But they have same output when both inputs are zero.
  14. E

    how to initialize PORT A of 18F4520 as input

    Why dont you use portD then. It is purely digital. So it is easier.
  15. E

    Alcohol Detector using MQ2 and PIC 18f452 or PIC18f4620

    I do not see gas sensor in your circuit. As I mentioned, gas sensor output should be connected to pin 2 (which is PORTA RA0). In software, you should declare RA0 as analog using ADCON. As a first step, you should make sure your gas sensor interface is working.
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