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Type: Posts; User: buiducthang

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  1. Replies
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    Closed: Re: gsm modem sim900 problem

    i have same problem. Plz help me.
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    1,086

    Closed: Problem with AT24C512

    Hi all,
    Im working with AC24C512 using ATMEGA64. I have code work fine with ATMEGA32 but when i use that code for my ATMEGA64, it did not work. I dont know why. After that, when writing to EEPROM, i...
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    4,046

    Closed: Re: MultiLayer PCB Designing Help!

    Thanks for replying. I refer in Altium Wiki and download some manuals. I also discovered Layer Stack Manager guide. But the information is not enough. I need some documentations with more details...
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    Closed: MultiLayer PCB Designing Help!

    Im designing in Altium Designer enviroment. Now, i want to design an mulitilayer PCB. How can i start? Does anyone have manuals for designing multilayer PCB?
    Thanks and regards,
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    1,443

    Closed: Help me with ENC28J60!!!

    Hi all. Im in designing with Ethernet project using ATMEGA64 and ENC28J60. However, im in trouble with the connection. In ENC28J60 datasheet, i see that it only support Ethernet (10Mbps), not Fast...
  6. Closed: Help about loadcell in Belt Scale pleaase!!!

    Im going to design a belt weighing. i have to chose a type of Loadcell. Who can tell me which type of Loadcell is most suitable for Belt Weighing? Thanks a lot.
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    Closed: Belt weighing device help!!!

    Im going to work in project related to Belt Weighing. My work is researching and finding the scale device in the market. But, this is the first time i work about Belt Weighing. So, i dont know who is...
  8. Closed: Re: Updating only one sheet from Schematic to PCB In Altium

    Well. If u want to implement if from the schematic itself, it is impossible. I think Altium's function : import changes from... can satisfy your requirements. For example, we have 2 sheets: Sheet A &...
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    Closed: Re: sim 300_v7.03 RoHS type 2 B datasheet

    do u mean this:
  10. Replies
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    Closed: Re: help in Avr program!!

    It is wrong. Becuase in PonyProg, let u see the notice below: Check items means programmed (bit=0). So if u want the chip work with external crystal, u have to config with all CKSEL uncheck. By...
  11. Re: Best Antivirus

    with me, it is Kaspersky Internet Security. Its light, effective and sensitive.
  12. Closed: Re: Updating only one sheet from Schematic to PCB In Altium

    Of course u can. U can import changes from one or more sections of Schematic providing that u creat a project correctly. When u change anything in your sheets, u need only choose Designe --> Import...
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    Closed: Re: SIM548 / SIM508 charging battery

    I think SIM548 have inside regulator. When we use 5V or 3.7V Battery, it convert into lower reference voltage (ie 3.3V). When have no 5V Power, it works with 3.7V Battery, when have 5V power, its...
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    Closed: Re: RealTimeOS Requirement

    Thanks. But im using AVR. Who knows what is the most suitable kernel?
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    Closed: Re: ac relay drive problem .Help needed

    I thinks u have to 2 things to correct:
    1) With DC 12V Relay, u needn't use RC snubber. U only need a Diot in parrarllel with DC Relay Coil.
    2) Your problem is in AC Relay. If u want to solve it,...
  16. Re: what software should I use for PCB design?

    i have been used Altium Designer for many years. I think its great. It is smart, having many functions. Moreover, u can simulate circuits. Vote for Altium Designer.
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    Closed: Re: AVR development board

    U can try some links:
    1)Kanda - AVR Universal PIC Programmer ICE ISP Training Embedded Modules
    2)Embedded System Design, Microcontroller Development Tools, Management & Marketing, Training,...
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    Closed: Re: help in Avr program!!

    If u used PonyProg to programme your chip, the first important thing u have to think about is the Fuse bit. U need to know your fuse bit configuration. For example CKSEL0 bit, CKSEL1 bit...It decide...
  19. Closed: Re: conevrting the physical quantity value into digital data

    Firstly, to read any physical value, u need convert it into digital. This is implemented through A/D converter. U can A/D converter outside your MCU or u can A/D intergrated in your MCU. (Now, there...
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    Closed: Re: difference 2g 3g

    U can find out more details about difference between 2G & 3G at: 3G - Wikipedia, the free encyclopedia.
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    Closed: RealTimeOS Requirement

    i have been working about MCU. Before, i often used structure:
    while(1)
    {
    ....
    }
    But now, with larger programme. I want to used Real Time OS. But i dont know which kernel i should use. I think i...
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    Closed: Re: Plzz Help! B688 become hot!!!

    Yes, Maybe we can avoid the physical law. This is linear supply voltage. So the heat either disspate in Regulator or in Q1. I think i have to use Switching Power supply.
    Thanks Bro!
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    Closed: Re: Plzz Help! B688 become hot!!!

    Yes, u are right. We can't change the fact that: the heat is (Input voltage-Output voltage). Input Current. But Q1 is power component. Its can work with large current throught it. My problem is when...
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    Closed: Plzz Help! B688 become hot!!!

    Hi everyone. I have designed a power supply with high current. I used 7805 with B688 follow this diagram:
    http://images.elektroda.net/76_1285916925.jpg
    But in this diagram, when current is about...
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    Closed: Re: rs232 protocol analyzer

    I used 232Analyzer. It is very impressive.
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