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Recent content by aj9999

  1. A

    Displaying characters on second line of 16x2 LCD JHD162A

    I have not used that LCD but usually there is simply a command to set the line such as 0x80 for the first and 0xC0 for the second. make sure that when you are writing that you arent accidently calling the home command which would put it back to the first line
  2. A

    help with SPI temp sensor PIC18f4520 in c

    What sensor are you using? and please post your code.
  3. A

    16F877A with 7segment sourse code

    16F877A with 7segment When you run any of these programs what does the display do? Does anything turn on? can you turn on and off the segments just by detaching them from the microcontroller and applying power to them?
  4. A

    HIGH CIRRENT H-BRIDGE TO DRIVE DC MOTOR !

    There should be plenty of schematics on the web , what you are trying to do isnt that complex. You will need a FET drives 4 FETs, 4 diodes, an inductor and other parts. Do you understand how an H bridge works? do need part choices?
  5. A

    new to robotics . .. please guide

    I am also a EE student I did a couple of projects with 8051 in Assembly. I was looking for other alternatives and I found there to me alot more printed material on the PICs than the 8051 (maybe it was just where was looking). So I bought various dev boards and started building a robot. 8bit...
  6. A

    Which Pcb Software to use for PCB designing?????

    I started with Eagle CAD from cadsoft(free) and then moved up to Altium which as others have said is a lot more complex.
  7. A

    16F877A with 7segment sourse code

    Re: 16F877A with 7segment SHow me our code so far, are you writing in Asm or C?
  8. A

    how to interface a PIR sensor to a micro

    Are you aware that you can get a PIR as a complete unit for~$10?. You just give it power and watch the output go low when something moves.
  9. A

    16F877A with 7segment sourse code

    Re: 16F877A with 7segment Could you be a little more specific. What are you able to do so far? Why are you concerned with PORTA are you able to get it working on PORTB?
  10. A

    16F877A with 7segment sourse code

    Re: 16F877A with 7segment Im sorry I dotn understand what you are asking. Are you saying that you know how to use PORT B and D but not A?
  11. A

    DC Current measurement

    Try MPJA.com have used their shunt resistors before and they are alot cheaper
  12. A

    problem in PIC16f877a (hardware)

    After you make the changes betwixt suggested , check that you have the WDT,BOREN both turned off. Maybe even make sure that SSPCON1 is set to zero to disable the SPI port, although it should start up with it disabled. Have you checked the Vss and Vdd pins at the uC with a multimeter or oscope...
  13. A

    problem in PIC16f877a (hardware)

    Add a 10uF and a 0.1uF cap , place them betweeen Vdd and Vss. Place it physically close to the PIC. You can tie the 2 pwrs and 2 grounds together. You might want to increase the xTal caps from 10pf to the standard 22pf. Make sure it is very close to the PIC and that the wires/traces are as...
  14. A

    problem in PIC16f877a (hardware)

    It is best to show those pins, if you choose not to show Vss and Vdd on the part you should at least show the capacitors that you have between pwr and gnd close to the part so that people know you have them. If you dont have those capacitors you need to add them. Also did you add the while()...
  15. A

    problem in PIC16f877a (hardware)

    You dont show pins 11,12,31 and 32 are they connected?
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