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Recent content by tomas

  1. T

    N4148 diode's purpose

    Hi, can anyone tell me, what is the purpose of 1N4148 diode on page 7? **broken link removed** Thanks for answer :)
  2. T

    rx tx switching PIC16F877

    there are transmitter and receiver programs (rfsim.mcppi and rfsim_rx.mcppi) - - - Updated - - - using these for transmitting/receiving http://www.abacom-tech.com/assets/data_sheets/RTF_L-DATA-SAWuser.pdf and PIC16F877 - - - Updated - - - everything connected ok ;) checked with oscillograph...
  3. T

    rx tx switching PIC16F877

    I need to turn on only receiver, transmitter should be off, ten receiver off, transmitter on. How can I do this switching? :( - - - Updated - - - What is these "syntax tags"?
  4. T

    rx tx switching PIC16F877

    Receiver (car): char receive; double volt = 0; unsigned char svolt[23]; void main() { TRISA = 0xFF; PORTA = 0x00; ADCON0 = 0b01000000; ADCON1 = 0b10001110; TRISC.RC6 = 1; TRISC.RC7 = 1; TRISB = 0x00; PORTB.RB0 = 1; TRISD = 0x00...
  5. T

    rx tx switching PIC16F877

    I tried TRISC = 0x80; also TXSTA=0b00000100; but PORTC TX pin always is +5V... :| how should I make it 0 V?
  6. T

    rx tx switching PIC16F877

    in which place i should use it? :) - - - Updated - - - and how this will turn off transmitter? :?
  7. T

    rx tx switching PIC16F877

    no, it is 2 PIC's and 2 transmitters/receivers (like a toy car and remote control) :) - - - Updated - - - problem is, that on the receiver part, transmitter pin is always high, so receiver cannot get the signal correctly... - - - Updated - - - if I cut the transmitter wire, receiver works...
  8. T

    rx tx switching PIC16F877

    Hi, Im using PIC16F877 and transmitter/receiver. but I cant receive signal correctly until my tx level is high. How can I make it low? (In mikroC language) Receiver Code: char receive; void main() { TRISD = 0x00; PORTD = 0x00; UART1_Init(2400); Delay_ms(100)...
  9. T

    circuit elements purpose

    Thank you, you helped me so much :) (y)
  10. T

    circuit elements purpose

    Hi, maybe anyone can answer me what's the purpose of these elements in circuit on page 7: 3 transistors 2 capacitors zener diode and 1N418 diode **broken link removed** I would be glad if anyone can help me :) (sorry for such a lame questions, Im just a beginner in electronics)
  11. T

    Antenna problem (RTF-DATA-SAW)

    Why? How you calculated it?
  12. T

    Antenna problem (RTF-DATA-SAW)

    I don't know, but i guess it should. Why do you think that it cannot transmit/receive long distances?
  13. T

    Antenna problem (RTF-DATA-SAW)

    I already bought RTF-DATA-SAW transceiver, so I need to solve issue with it ;/
  14. T

    Antenna problem (RTF-DATA-SAW)

    Hi I have done PCB and soldered all components. PCB: All things working fine, signal is transmitting, and receiver part receives signal correctly. But the problem is DISTANCE... It works only in 10 cm range.. I need 10 meters minimum.. Transmitter and receiver I use...
  15. T

    Filtering noises (PIC16F877 and L293D)

    My power source for L293D is 6x AA batteries x 1,5 V. For microcontroller its 9V battery. I use ceramic capacitors of 0.1 uF and electrolytic capacitors of 100uF/16V - - - Updated - - - now I find out that with ceramic capacitors circuit works fine, but when I add electrolytic capacitors...
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