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Recent content by mentoz

  1. M

    Keypad and LCD interfacing for 8051

    I just compare two input (pir1 & pir2) to get output=1. and if the output=1, then activate EA(enable interrupt)
  2. M

    Chip Enable Program Error

    my AT89S52 also face the same problem. "chip enable program error" anybody can help? - - - Updated - - - well, I just fixed it. it caused by my microcontroller pin is connected directly to ground. so I just disconnect it and finish..
  3. M

    microcontroller latch up problems

    Actually I don't know how to identify it is open colector or not.. but I already use 10k pull up resistor for my sensor but it's still the same problem occurs.. is the floating only happen to input??
  4. M

    microcontroller latch up problems

    hi there, I get weird problem with my AT89S52, I use PIR sensor, for first detection it is good enough, but after that it detect every three second (triggeer repeatedly) even ther is no movement in front of. is it kind of latch up?? thanks
  5. M

    microcontroller code error in C

    i little bit confuse with my problem, because the microcontroller is went wrong but in proteus everything is alright. is there someone check for this C code? especially inside main body and while 1, because the time cannot be decrease less than three seconds. let me know if ther is something I...
  6. M

    interfacing of PIR sensor.

    high is 3.2V and low is around o.3mV. when I install PIR sensor without microcontroller it detects very well only when I move in front. but when I connect with microcontroller it goes low and high changing periodically every three second. I already use the transistor BC547 connect to out signal...
  7. M

    interfacing of PIR sensor.

    i also meet the same problem with my PIR sensor. actually the output of the sensor is already correct, but when I connect to microcontroller, it goes high and low frequently even there is no movement.. is anyone can help? thanks.
  8. M

    Keypad and LCD interfacing for 8051

    #pragma SMALL DB OE #include<stdio.h> #include<reg52.h> //#include"stdlib2.h" #define port P3 #define dataport P2 #define key P1 sbit rs=port^7; sbit rw=port^5; sbit en=port^6; sbit col1=key^4; sbit col2=key^5; sbit col3=key^6; sbit row1=key^0; sbit row2=key^1; sbit row3=key^2; sbit...
  9. M

    3X4 keypad + LCD display

    As I mention above, I use atmel 89s52 and also keil compiler.. is it possible?? thanks.. :)
  10. M

    3X4 keypad + LCD display

    here is the code #pragma SMALL DB OE #include<stdio.h> #include<reg52.h> //#include"stdlib2.h" #define port P3 #define dataport P2 #define key P1 sbit rs=port^7; sbit rw=port^5; sbit en=port^6; sbit col1=key^4; sbit col2=key^5; sbit col3=key^6; sbit row1=key^0; sbit row2=key^1; sbit...
  11. M

    Keypad and LCD interfacing for 8051

    Hello there, i have problem with my keypad and LCD.. I use 89s52 and already build my own code using keil. the LCD should display 3 digit that pressed on keypad, unfortunately the lCD only show the first number that I pushed until three times.. can anybody help me? thanks..
  12. M

    3X4 keypad + LCD display

    Hi there, I think I have the same problem with isabella, but I'm using AT89S52.. I already build my own project, but it read my first push and display it again and again.. could you help me please.. thanks..
  13. M

    8051 real Time Clock

    just consider how to buil real time clock using my 8051 without RTC device such as DS1307, etc.. Is it possible? Thank you.. mentoz
  14. M

    89S52 countdown timer

    How about the main body? I already built something like this TMOD=0x01; EA=0; TH0=50621/256;TL0=50621%256; ET0=1; EX0=1; IT0=1; PX0=1; TF0=0; EA=1; //TR0=1; countvalue=300; //initial count value int input,hours,minutes,seconds; col1=col2=col3=1; out=0; lcd_cmd(0x38); lcd_cmd(0x0e)...
  15. M

    89S52 countdown timer

    I want to build a countdown timer using 89s52 set by 3x4 keypad and display it in LCD, but I don't have idea how to build so that the timer will decrement every 1second.. I already can anyone help me in to program in C code especially with Keil.. thanks..
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