RFEFX boards Detailed


+ Reply to Thread
Results 1 to 2 of 2
  1. #1
    Join Date
    Nov 2006
    Location
    Murrieta, CA
    Posts
    62

    Default RFEFX boards Detailed

    ok, so here are the detailed features of my board.
    - The board is based off the PIC16F877A microcontroller, since I came across a bulk purchase of these processors. The board features a 20MHz crystal.
    - voltage (6-12v) is applied to the Surface mounted DC Barrel Jack and fed through a resettable fuse and into a 5Vdc LDO.
    - Unlike some Arduino boards i made it a point to have 5V available at every header. so for each header you will find 5vdc and ground encasing each header.
    - 5v is fed to an onboard 3.3v regulator for the 433MHz Linx Technologies Reciever/Decoder. sorry i did not bring 3.3v out to a header. The Receiver also has 5 dedicated input Ports [A4:A0] to the pic.
    - I am not a fan of parallel so Ports [D7;D0] are fed to an 8-bit Darlington Array which drives 8 Blue LEDs and the entire header on the far right hand side of the board. the LEDs can be disabled via Mosfet setting PortB.1 Low .
    - Ports A5, and [E2:E0] are standard I/O's, However, the 4 pin surface mounted dip switch dertermines wether these I/O's are pulled up through a 10k resistor or not. Useful if you need some buttons for your project.
    - I made ports [C2:C0] independent headers for the sole purpose of serial devices. i use the RFID module from parallax as well as the uOLED-128-G1 display on these headers. power,ground,signal... simple and Perfect !
    - Up on top is a dedicated SPI bus for parts that require some major bit banging. the Winbond ISD series voice chips come to mind. RC5/SDO,RC4/SDI,RC3/SCK,and RB3/SS are available on this bus.
    - Last but not least is the communications bus. Here you will find RC7/RX, RC6/TX, RB5, and RB4. This bus is used by the XBEE AEGIS Daughter board shown below.

    I have modified my Melabs USB U2 Programmer for ICSP programming through the Mini-USB-B connector. Although not shown I have designed adapter boards that will connect to the Mini-USB and the U2 programmer via the 10 pin ISCP header.

    And there you have it.

    Name:  IMG_3395.jpg
Views: 299
Size:  186.0 KB Name:  IMG_3393.jpg
Views: 292
Size:  191.2 KB Name:  IMG_3396.jpg
Views: 300
Size:  184.7 KB Name:  IMG_3402.jpg
Views: 306
Size:  176.7 KB Name:  RFEFX_board.jpg
Views: 291
Size:  95.0 KB

  2. #2
    Join Date
    Aug 2010
    Location
    Maryland, USA
    Posts
    869

    Default Very Nice!!

    I like it, seems well thought out and nice clean execution!!
    -Bert

    The glass is not half full or half empty, Its twice as big as needed for the job!

    http://foamcasualty.com/ - Warbird R/C scratch building with foam!

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts