Rustic Engineering

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This blog claims to be a place where you can find some electronics stuff made by me, and other things…

Written by forrequi

November 13, 2007 at 11:55

7 Responses

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  1. Hello,

    I’ve made up a board with the PIC18F14K50 also using a 12Mhz crystal. Can you tell me the configuration bits you used to get your pic going? I am developing in mikroBasic, but the config settings i’m not sure of are:

    CPU System clock divide (choices are : no divide, /2 , /3, /4)

    USB Clock Selection bit (direct or /2)

    Oscillator (I believe it should be HS)

    4 X PLL enable bit (direct, or * 4)

    Primary Clock enable bit (enabled or disabled)

    thanks for your help!

    J

    J Weinmann

    June 13, 2010 at 13:18

    • There’s the correct configuration:

      CPU System Clock Divide: No Divide (no CPU clock divide)

      USB Clock Selection bit: OFF (or direct, so USB Clock comes directly from the OSC1/OSC2 oscillator block; no divide)

      Oscillator: HS Oscillator

      4 X PLL Enable bit: ON (Oscillator multiplied by 4, so you get 48MHz for USB full-speed)

      Primary Clock Enable bit: ON (Enabled)

      Good luck!

      Rodrigo Forrequi

      June 13, 2010 at 14:46

  2. Hi a want to know everything about your board with the
    PIC18F14K50.
    I’m planing to make 4 relay output and 4 optoisolated inputs board for science projects using MSWlogo with my kids.
    Do you sell the boards and help with the code?
    regards,
    Vicente

    Vicente González

    December 3, 2010 at 16:47

    • Hi Vicente,

      Email me about your project. I have more boards too. Thank’s

      forrequi

      December 4, 2010 at 00:16

  3. My idea is to use the OLIMEX board: PIC-IO as a reference.
    After make some code refinamments and added some commands, I’m using the board connected through a USB-RS232 adapter and using Transformer for the power supply.
    The idea:
    -To have a control board directly connected to the USB port.
    -All the power will come fron the USB port also.(100mA max).
    -Using 4 relays 842A-5 :
    35mA to connect and 13mA for holding the connected state.
    Using an algorithm to delay simultaneous connections the max.
    current will be limited to 74mA (36 mA left for the PIC and LEDs). 10 milliseconds need this relay to reach the holding state.
    In 30 milliseconds (worst-case) all the relays reach the desired state, enough for the application.

    -With such a control board, and using a Logo environment for
    programming, is possible to control motors lights etc..
    and reading switches.

    -Each Science Project (elevator, crane, semaphor, parking barrier…)
    will have a controller board atached.
    Each Science Project will have his power source (battery pack) and the control board is isolated (using optocouplers and relays).
    -The board will be as tiny as possible with screw terminal blocks for inputs and ouputs (like the OLIMEX PIC-IO).

    Vicente Gonzalez

    December 6, 2010 at 05:42

    • Ok, it’s very realizable. I think this board can help you.

      forrequi

      December 6, 2010 at 07:52

  4. Hi Rodrigo,
    I’ll need a couple of your boards, working with the OLIMEX’s code responding to serial commands from a text terminal.
    And the documented source in C (Hi-TECH PIC18 compiler prefered).
    I just want to skip dealing with the USB stack configuration as a serial port …
    I have a DHL account if needed.
    Vicente

    Vicente González

    December 6, 2010 at 13:44


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