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Recent content by karthi_keyan

  1. karthi_keyan

    3 V DC regulator for microcontroller power supply

    hai, better u design with adjustable voltage regulators like LM317.vary the values of resistors and get the voltage whatever u want! NOTE:VIN>(1.5 + Vout). regards karthikeyan
  2. karthi_keyan

    what FET is suitable for LED matrix display?

    hai all , presently am design led matrix display system.i tried with 16*16 with ULN .its look brighter when a single row is powered while powering the 16 rows the current is not enough and LED lost its brightness .so i referred some topics they suggest to put a FET . i need a part number which...
  3. karthi_keyan

    suggestion need REG:RMS-DC-converter

    hai all, i referred some site to use RMS-Dc converter at the end of current sensor output. is it necessary to add RMS-DC-converters? Analog:AD736,AD737 from analog devices LTC1966 from linear is anyone tried that type of converters.how was the accuracy(linearity)? regards, karthikeyan
  4. karthi_keyan

    interfacing ACS756(HALL Current sensor)+(ADC-PIC)

    hai ALL, presently am designing power monitoring system project. In that am using ACS756 IC(hall effect current sensor IC). it gives sinusoidal output corresponding to the load(normal -1.6 DC in multimeter) when i trying to interface it with ADC of my controller, i try to catch...
  5. karthi_keyan

    Sourcing ACS758 hall effect current sensor

    hai, presently am designing power monitoring system project in that am using ACS 756 IC. it gives sinusoidal output corresponding to the load . when i trying to interface it with ADC of my controller, i try to catch the peak voltage of ADC for corresponding loads. but the out put is not stable...
  6. karthi_keyan

    shunt transformer(zero cross) current measuring with PIC

    hai every one, i need a suggestion reg: how to measure line current values from shunt transformer circuit which having zero cross detect output,am interfacing the shunt transformer output with PIC controller. regards karthikeyan
  7. karthi_keyan

    programming pic16f877a - problem

    hai kee, this is your main it called all ur functions one time.it run one time only void main() { TRISB=0; Keypad_Init(); Lcd_Init(); Lcd_Cmd(_LCD_CLEAR); Lcd_Cmd(_LCD_CURSOR_OFF); UART1_Init(9600); Delay_ms(100); start(); } do like this void main() { TRISB=0; Keypad_Init(); Lcd_Init()...
  8. karthi_keyan

    programming pic16f877a - problem

    sorry now only am seeing your main, write all ur function in this manner main() { initlcd(); initkeypad();//dont init ur peripherals in side while (1) while(1) { watch keypad()//whatever u have to do then if its goto that thanks function call ur...
  9. karthi_keyan

    urgent! Help Check if My Circuit is Correct!

    hai samuel, nice design ya,here some correction 1. Put 0.1 uf capacitor near by controller between vcc and vss. 2. key bounce capacitor in MCLR and switches will help u to get correct pulse form status. 3.see the current rate of stepper motor and selected driver. if...
  10. karthi_keyan

    programming pic16f877a - problem

    hai kee, call ur main function like this main(); after displaying 'thanks',and avoid while(1); in your code,in some other cases it ll bug ur software. regards karthikeyan
  11. karthi_keyan

    EEPROM Initialization with MPLab

    try this void write_eeprom(unsigned char x,unsigned char y) { EEADR=x; EEDATA=y; EECON1bits.EEPGD=0; EECON1bits.CFGS=0; EECON1bits.WREN=1; INTCON=0x00; EECON2=0x55; EECON2=0xaa; EECON1bits.WR=1; while(EECON1bits.WR==1); while(!PIR2bits.EEIF); INTCON=0xc0...
  12. karthi_keyan

    ATmega32 interfacing with sim300z GSM modem

    hey it ll surely reply 1.check ur PC comport first,set ur controller baudrate with modems default firmware baud rate. 2.if it is a evaluation board it will work with straight cable RS232(DB9). 3.if it is ur own design check status pin whether its turned on or not because if u type anything when...
  13. karthi_keyan

    GSM modem with PIC 16F877A

    hai, first check which mode ur phone is in default.with this following AT coomand AT+CMGF? if its 0 -->PDU mode 1--->text mode ya it can be modified via like AT+CMGF=1 text mode is the best method. regards, karthikeyan
  14. karthi_keyan

    Detecting if subject is asleep without contact

    Re: planning a project! its a big R&D .but nice one
  15. karthi_keyan

    line current value calculation with ADC of PIC

    hai cam, ya i tried with 10uf capacitor at the end of the opamp IC of power measuring unit .but still its not stabilized its still wobbling. i think some other method is there to measure from shunt transformer output. can anyone suggest me a better solution in this? regards...

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