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Recent content by oufuqiang

  1. O

    [SOLVED] SIM908 GPS: how to extract the Longitude,Latitude

    unsigned char get_str_by_start_length(unsigned char * get_to,unsigned char start,length,wait_time) { uchar count,cpy_count; count=0;cpy_count=0; ten_ms_count=0; length=start+length; do { RI=0; while(RI==0 &&...
  2. O

    How to: LED strip 12V ON = fade in, OFF = fade out

    try this......
  3. O

    gsm based rolling display

    read message from GSM module. such as SIM300，SIM900。then display on LED matrix.
  4. O

    Microcontroller 8051

    DTMF decoder MT8870.
  5. O

    Generatng random number in Keil C51 Compiler

    srand(Read a value from the ADC).
  6. O

    555 timer frequency problem

    ne555 maximum operating frequency is only 100KHz. Why not use a crystal oscillator?
  7. O

    SIM900A network registration problem

    1. use mobile phone to test your SIM card. 2. use scope to monitor VBAT wavefrom.
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