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Recent content by ecnbom

  1. E

    Why this buzzer is not working?

    The LED is put in paralle with buzzer and without current-limiting resistor, then the voltage on the buzzer + is always voltage-drop of LED, 1.8V more or less. that why no beeps.
  2. E

    Connecting 240V live mains to PIC microcontroller safely

    Hi, connect IO through 1M resistor to 240VAC directly, it is OK for MCU since there are 2 diodes built inside, which can limit the voltage at IO from -0.7 to VDD+0.7, however, the system is hot, and can not touch directly. it is a wide use solution, let me know any doubts.
  3. E

    Help me !! Relay's Problem ( SMS Based Device Control )

    Help me !! Relay's Problem ( SMS Based Device Control ) I am attaching the circuit diagram of my project Serial Communication (MAX232) and LCD are working perfectly i have so many doubts regarding my circuit 1) is 12v 1 amp transformer is sufficient to drive 3 relays using uln 2003 It is OK...
  4. E

    [SOLVED] 1.5v power for a microcontroller

    You have so many solutions. You can check SH66L06A(sinowealth), Winbond or Tenx. and the cost I mentioned is around USD0.1. The only doubt is how to drive LED with single 1.5V battery.
  5. E

    89s52 program using serial port

    atmel isp at89isp cable You can do this project use the printer port of you pc directly. there are so much circuit on the web site!
  6. E

    Universal Microchip PIC Programmer

    You can seach "K149C"OR"K150" in google, it really a nice one.
  7. E

    visual simulation software for 8051, virtual trainer kit

    virtual kit Proteus and multimcu.
  8. E

    help on avr programming - problem with C syntax

    help on avr programming Hi mehipour: I think the whole word is " if (PINB &(1<<PB2)) == 0) " it means if PB2 is equal to 0(PB2 is low). In ICCAVR, to get a status of a IO(eg.PB2), you can read register PINX(eg.PINB), but the value consist of all PINX(8 bits), so you must...
  9. E

    where can I but development kit for STM32

    STM32 Hi northmoonwalker: I bought a nice one ($55)from here: **broken link removed** The website is in Chinese, and if you are not convenient to buy it, you can contact me. My email is ecnbom@126.com Bill
  10. E

    Buying components from China? Not a chance

    China? Not a chance Could you tell us which country you come from.
  11. E

    We are all from China

    From China Hello all: I am Chinese.work in ShenZhen now. It really a nice thing to make friends to everybody here. regards to all .
  12. E

    A question on Atmega8

    using ponyprog to download.
  13. E

    5v output of pic18f to 12vdc

    Attached picture is just a switch circuit. Pls refer to MC34063 to get information of step-up circuit.
  14. E

    How to use a MOSFET transistor as a switch to drive a motor?

    oscillate when mosfet turn on Hi Gameelgamal: Choose IRFZ44N to control a 10A load may cause it too hot. I think you'd better to choose a new model. A pull-down resistor(10K 1/4W) is necessary.
  15. E

    How to use a MOSFET transistor as a switch to drive a motor?

    irfz44n inductive load Cheers is right. Aslo,a pull-down resistor which can reduce the input resistance of the MOSFET to avoid static.
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