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Recent content by alireza11361156

  1. A

    Lack of serial data transmission by GSM sim300z

    I do not know what pump pins. Voltage on VCC pin is 4.4V and Voltage on SIM_VDD is 2.9V. Voltage module is the problem?
  2. A

    Lack of serial data transmission by GSM sim300z

    When I sent "at" command through the COM port, TXD pin module pulses in the range of less than 0.5 V
  3. A

    Lack of serial data transmission by GSM sim300z

    My circuit has met the same problem. It is possible the problems of poor nutrition module. Does anyone have a solution?
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