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Recent content by koky

  1. K

    Trying to read a PIC16F57 with ICD2...

    have you put a 10k resistor from pin 2 to pin 28 ?
  2. K

    [SOLVED] Communication Problem:: RS-485 (MASTER) and RS-485(SLAVES)

    Re: Communication Problem:: RS-485 (MASTER) and RS-485(SLAVE have you put a pullup resitor on rc7?, why in the photo of scope rc5 is high during rx signal testing?
  3. K

    Problems with PORTE in the PIC16F877A

    have you set adcon1?? movlw b'10000110' ; Set all digital movwf ADCON1 ;
  4. K

    Looking for an equivalent of PIC16C73A which is a flash chip

    16f73 microchip project example in my project i have replaced 16C73 and 16F73 with 16F737, has more option and its more cheap
  5. K

    why RS485 needs isolated device??

    see pag 25
  6. K

    why RS485 needs isolated device??

    usually for rs485 is not need isolated device, only in particular case, for prevent ground loop voltage differential, you can connect by resistor of 100 ohm all gnd circuit using shield line of rs 485 cable. Isolated is need only in very noise industrial application
  7. K

    what (1<<LCRW) mean ?

    is : movlw (1<<LCRW) and the software work, but i don't like use sw with strange assembler, i prefer rewrite it in more readable system
  8. K

    what (1<<LCRW) mean ?

    I have found this source, but i don't understand why is used movlw (1<<LCRW) what is the result ? why is not used a real value? LCEN equ 1 ;rb1 LCRW equ 2; rb2 LCRS equ 3;rb3 tst_lcd_busy movlw (1<<LCRW) movwf PORTB waitbusy bsf PORTB,LCEN ; get hi-Nibble rlf PORTB,w ; Busy-flag to...
  9. K

    PIC and wdtcon problem

    pic wdtcon i have notice with pic16f737 and 12f683 that when i set wdtcon timer0 not work right. also if in the option register i set PSA=0 (prescaler assignet to Tmr0), the interrupt for tmr0 non work tipical setting of wtdcon that i have used was: Bank1 bcf OPTION_REG,PSA ...
  10. K

    RS232 MsComm Handshaking

    rs232 handshaking with the pic you can simply use the cts for permit at the pc to send the rs232 string is not need timer, you use cts as a switch. The only, but not little problem (that i haven't solve), is that when you want stopped the data from PC, and for this you change cts level, the pc...
  11. K

    Need a shematic of FSK Modem!

    you can use also CML fx604 or fx614
  12. K

    interface ST7537 with pic

    st7537 try to read **broken link removed** https://xoomer.virgilio.it/lorix/pdf/05.003.001.pdf https://xoomer.virgilio.it/lorix/pdf/st7537%20app%20note.pdf
  13. K

    Packet or 8/n/1 ?? what is the best for radio ?

    I'm curiose becouse in ham radio is used complicated AX25 streaming and not simple and standart serial treaming 8n1. There are some valid motive ?
  14. K

    Road Traffic Signals LEDS

    is better more little led (8000 mcd each), than few power led, with more led you have diffused light and you can put them instead of normal lamp, with power led (usually 6 led) you must have special lens.
  15. K

    4x7 font code for MAX6953

    control max6953 in similar situation i have used this font:
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