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Recent content by AKENAFAB

  1. A

    Does anyone know SIM908 test circuit schematic ?

    Download the PDF called "sim908 hardware design v2.0"
  2. A

    Correct Sim908 GPS Antenna

    Hi I have bought this antenna If your design will be at open air you should try passive antenna otherwise active. I'm workin on Sim908 too , take a look regards!
  3. A

    Project Help Required: Car Security System

    Yes , parallel capacitors but closely to VCC pins of mcu. This is to avoid or reduce perturbance. 1000uF for low frecuency ,it makes the VCC source smooth but it can't smooth high frecuencies that's why you add 0.1uF and 0.01uF . There is no problem with Vref. LP filter means Low Pass filter ...
  4. A

    problem in BT136 and MOC3021

    My circuit has been working for a while. Just change resistor values for zerocross LED,triac resistors/moc3020(400v peak ) There are calculated for 127VAC. regards!
  5. A

    problem in BT136 and MOC3021

    I made this and works great. **it was for 127v not for 220v **broken link removed** regards!
  6. A

    Project Help Required: Car Security System

    Try to keep away the relay from the mcu lines. Add some bypass capacitors to mcu psu,let me explain ,connect the 0.1uF and 0.01uF capacitors as close you can to VCC pins of mcu. This should help. Regards! The Bypass capacitors are a rule. THen Check LP filters.
  7. A

    small devices for power line communication

    AVR zigbee silicon labs NRF24L01 Maybe the nordic modules could be good for you https://www.nordicsemi.com
  8. A

    [PIC] i want to interfacep18f4520 with MMC(sdcard)

    Download the microchip stack memory disc drive. **broken link removed** It's all that you need.
  9. A

    my sim900D keep on restarting itself, will installing customer flash loader solvethis

    You should check your power supply first,then try to update the firmware.
  10. A

    Best GPRS module for internet connection.

    It's a good module , you could use sim908 , it also includes a GPS almost at the same price. The sim modules has a lot of info.
  11. A

    Is there any alternative capacitor instead of 0.1uf ?

    Use 22pf for xtal oscillator and the 0.1uf and .01uf for DC decpoupling.
  12. A

    How to send 24 bit data using UART in PIC18F4520

    As ligo says. Divide your data in 3 parts then use the USART todo send 8 bit packets(data low, mid and high). That`s the best way or you could use software USART and send the complete 24bit data at once.
  13. A

    Power supply for servo

    Yes,You can connect it directly ,there's no problem.
  14. A

    [SOLVED] Problem with HO of IR2110

    You have to connect the high side mosfet to work properly and you will see the change between states. Regards!
  15. A

    Help for chosing Pic!

    Hi check microchip page Microchip Technology Inc. | Motor Control and Drive - Overview Try to use a pic18F wich has better hardware and performance than a pic16 but if you need more math pic24 could be the best, there is a long bridge between pic16/18 to pic24/dspic. regards!
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