12f675_fuse_about_to_blow!


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  1. #1
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    Hi mackrackit

    This might be a place to start
    http://www.farnell.com/datasheets/309975.pdf
    Absolutely, I tracked down the Microchip.pdf (same one I think) anyway my PICkit1 does have header J3 on it, so that's a help.

    I spent ages last night mulling over how all this might work and it seemed to me that I either:

    1/ I need two PICkit1 boards one for the TX and one for the RX.

    2/ The TX is 'stand_alone' with a battery fitted - However, the TX has a socket for a 12F675 (you have to break some tracks for this to work I think) So I'm not sure if the TX will work without the 12F675 and tracks broken in some kind of test mode (if that makes sense). Or will only work as 'stand_alone' with a program loaded into the 12F675 and tracks broken.

    Dave
    Last edited by LEDave; - 26th June 2010 at 10:47.

  2. #2
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    Both modules are stand alone. The 8 pin socket on the transmitter is optional. I would not cut anything at the moment.

    It is my understanding that the rfPIC12F675 is just a 12F675 with RF on board, plugging the modules into the PICKIT1 is just a way to program them.

    I bet the software for the PICKIT1 sees the modules as is. Have you plugged either one into the PICKIT1 yet?

    One the modules are programed you should be able to power them with out the programmer attached.

    Maybe...
    Dave
    Always wear safety glasses while programming.

  3. #3
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    Both modules are stand alone. The 8 pin socket on the transmitter is optional. I would not cut anything at the moment.
    Really pleased to not have to cut the tracks, I was dreading that job!

    I bet the software for the PICKIT1 sees the modules as is. Have you plugged either one into the PICKIT1 yet?
    No I haven't plugged either into the PICkit1 as yet. The TX has a battery holder for a round CR2032 battery (which I don't have), I'm thinking if I got one of these (tomorrow) for the TX and plugged the RX into the PICkit1 we have two fully powered TX_RX circuits. How does that sound?

    Dave

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    That should work.
    It also looks like it you leave the program power jumper on you should be able to power the transmitter while in a breadbord from any 2 to 5 volt source.
    Not sure how long the coin battery will last.
    Dave
    Always wear safety glasses while programming.

  5. #5
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    It also looks like it you leave the program power jumper on you should be able to power the transmitter while in a breadbord from any 2 to 5 volt source.
    I saw that, very handy. It would be good to buy a few expansion headers (J3) as well if I can source them, rather than solder the actual modules onto a vero board.The TX module won't push into my breadboard either (a real shame that) as the pins lie flat against the circuit board, again a J2 header would have solved that, never mind.

    I'm so keen to try these modules out that I've been seriously thinking of soldering the TX module to a vero board and running a power supply to it but after a rush of blood I've decided to get the battery tomorrow and have TX stand alone using the battery and RX in the PITkit1.

    Roll on tomorrow.

    Dave

    PS: The Badger hasn't made an appearance for three nights in a row now, we're a little worried for him....
    Last edited by LEDave; - 26th June 2010 at 21:26.

  6. #6
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    I've bought a 3v battery for the TX and fitted it, a red LED blinks when either push button switch 1 or 2 is pressed, so seems to be working.

    As for the the RX module (I haven't inserted this yet), the evaluation socket is empty and the PIC16C745 Firmware chip is still in place. I'm tempted to insert the RX module into the J3 Header but haven't.

    Not sure what to do next.

    Dave

  7. #7
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    This is what microchip has to say:

    http://ww1.microchip.com/downloads/e...Doc/70092a.pdf


    1.3 GETTING STARTED WITH THE rfPIC DEVELOPMENT KIT 1
    The transmitter modules come pre-programmed with a transmitter demonstration. The
    enclosed PIC16F676 is programmed with a receiver demonstration program. Together
    they demonstrate an on-off command and control application.
    The PICkit 1 FLASH Starter Kit serves as a low-cost development and demonstration
    platform for the transmitter and receiver modules.
    To see your rfPIC Development Kit 1 in action, perform the following steps:
    1.3.1 Preparing the Receiver Module for Operation
    Step 1:
    Familiarize yourself with the PICkit 1 FLASH Starter Kit operation by reading the
    PICkit™ 1 FLASH Starter Kit User’s Guide (DS40051) and performing some of the
    tutorials. Familiarity with the PICkit Starter Kit will be assumed throughout this user’s
    guide.
    Step 2:
    Remove power from the PICkit Starter Kit by disconnecting the USB cable.
    Step 3:
    Remove the PIC12F675 from the PICkit Starter Kit evaluation socket.
    Step 4:
    Insert the PIC16F676 into the PICkit Starter Kit evaluation socket. See Figure 1-1.
    Step 5:
    Insert a receiver module (315 or 433.92 MHz) into the PICkit Starter Kit expansion
    header J3. Make certain that the receiver module is oriented correctly. See Figure 1-1.
    So it looks to me that if I'd have bought a complete rfpic development kit it would have come with a PIC16F676 programmed with a receiver demonstration program. So the TX has a demo program installed but I haven't got a PIC16F676 for the RX with a demo program.

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