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Basic Stamp OEM Minimums — Parallax Forums

Basic Stamp OEM Minimums

JomsJoms Posts: 279
edited 2007-09-09 11:39 in BASIC Stamp
I am fairly new to the Basic Stamp but fairly familiar with electronis.· I have been playing with the basic stamp and its programming for a circuit that I am building.· I am looking to install the OEM style of the Stamp with only the minimums because I will not need to hook a computer to it once the chip is installed.· Could someone please look at the attached file and tell me if they think it will work.· I can build this circuit for almost $14 a piece vs $49 a piece for the whole stamp package.

Also, I have ordered a serial LCD display to add to his project.· Does that just connect to one of the Data pins such as "P15" or does that connect to the Serial Out pin.· If it does connect to the serial out pin what other components if any would I need between the PIC chip and the LCD display.

Attached is a drawing of what I intend to build.· It was modeled off of the one available from Parallax which can be seen at http://www.parallax.com/dl/docs/prod/schem/bs2oem.pdf·.

Please give me your input as to if this circuit will work or not.· Thanks!· James
BasicStampOEM.JPG
843 x 705 - 48K
BasicStampOEM.JPG
843 x 705 - 48K

Comments

  • RDL2004RDL2004 Posts: 2,554
    edited 2007-09-08 11:44
    You do have to buy the PIC pre-programmed from Parallax. If it isn't pre-programmed with their PBasic interpreter it won't work as a Basic Stamp. I would be sure to socket the chips. I would also at least bring out the programming connections to a pin header just in case reprogramming does become necessary - it will add very little to the cost (though since the program itself resides only in the eeprom, you could just pull it out and put it in an actual BS2 OEM and load a new program that way).

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    - Rick
  • Steve JoblinSteve Joblin Posts: 784
    edited 2007-09-08 14:06
    I too had the same idea... please refer to post http://forums.parallax.com/showthread.php?p=567989·for details.

    A Stamp is essentially the pre-programmed PIC chip, an EEPROM, a resonator and a few resistors.· All the other components are for the Reset circuit, the Voltage Regulator Circuit, and the Programming Interface Circuit.
  • RDL2004RDL2004 Posts: 2,554
    edited 2007-09-08 15:13
    I had forgotten about that thread. I used the info there to build my own BS2 on a breadboard. It definitely will work. I thought I would also point out that for only $1 more you can get a blazing fast BASIC Stamp 2SX interpreter chip.

    Starting with either of these pre-programmed chips and assembling your own Stamp is one of the easiest and more economical ways to get involved in micro-controller programming you will find.

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    - Rick
  • JomsJoms Posts: 279
    edited 2007-09-09 00:13
    THANKS! for all the help! I did not relize that there is preprogramming in the chip. I was placing a larger order from DigiKey for the rest of the components on my board, so I was just going to get the PIC chip from them. I did not relize that I need to buy the ones from Parallax because they have some type of preprogramming on them. That is the way I understood what was said anyways, but correct me if I am wrong.

    Also, please do not think that I am getting information and drawings from Parallax and buying my parts elsewhere for cheaper. I do buy a fair ammount of compents from Parallax. Acturally for this project I am intending to buy a few homework OEM boards to use as the programmer and several serial LCD displays directly from Parallax.
  • JomsJoms Posts: 279
    edited 2007-09-09 01:16
    Does anyone know if I can get the EEProm from DigiKey Vs. Parallax? Basically is their programming that parallax puts in these chips before they send them out? I am going to be getting the PIC chip from Parallax but there is a $4.50 price different per chip on the EEProm. It is the small 8 pin din packaged chip. Thanks! James
  • allanlane5allanlane5 Posts: 3,815
    edited 2007-09-09 01:41
    As long as the eeprom chip is EXACTLY the same part number (except for packaging, that can vary) then it should work. But don't get a 'bigger' eeprom in hopes that you can use the extra space -- that's not going to work. The PIC16C57 is programmed with the PBasic run-time environment, which expects a particular eeprom.
  • JomsJoms Posts: 279
    edited 2007-09-09 02:56
    Allanlane5, Thanks! The one I am looking at looks exaclty the same. There is one of the last letters in the number that is different but I dont think that it matters in this application. All of the specs seem to look exactly the same...
  • RDL2004RDL2004 Posts: 2,554
    edited 2007-09-09 11:39
    Sorry if I wasn't real clear on this. It's your program that goes in the eeprom. When you buy the eeprom it's empty. The Parallax PBasic interpreter is only in the PIC.

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    - Rick
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