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My Peopeller won't SPIN — Parallax Forums

My Peopeller won't SPIN

NewzedNewzed Posts: 2,503
edited 2006-06-18 05:17 in Propeller 1
Finished assembling my board, checked all DC voltages, plugged in the Propeller and the other two chips.· Tried both USB2SER and my serial cable· but my PC can not find the Propeller,· The board is laid out exactly like the PropStick -· I think.· The only difference is· I am using a 2N2222A instead of a 2N3904.· I have attched the Express layout of the board.· Just remember you are looking at the botton of the board·- Pin 1 of all chips has a square pad.

I hope someone can help.· I would really like to get my Propeller SPINning.

Sid

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Sid Weaver
Do you have a Stamp Tester yet?
http://hometown.aol.com/newzed/index.html

pcb
pcb
Propeller Express Rev A.pcb
23K

Comments

  • cgraceycgracey Posts: 14,133
    edited 2006-06-16 19:22
    Sometimes RX and TX get switched around because of their mirror-like naming conventions. Try switching them and see what happens.

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    Chip Gracey
    Parallax, Inc.
  • NewzedNewzed Posts: 2,503
    edited 2006-06-16 19:56
    Chip, my board is laid out just like the PropStick:

    DB9.2 to 3232.7
    DB9.3 to 3232.8
    DB9.4 to 3232.13
    3232.9 to Prop.A31
    3232.10 to Prop.A30 - pulled high

    Could using the 2N2222A instead of the 2N3904 cause a problem?

    I'll try anything you suggest.· Remember I'm using a built up PC board.

    Sid

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    Sid Weaver
    Do you have a Stamp Tester yet?
    http://hometown.aol.com/newzed/index.html

    ·
  • cgraceycgracey Posts: 14,133
    edited 2006-06-16 20:53
    Well, as long as·a 3904 and 2222 have the same BCE pins, it should be fine.
    Newzed said...

    Chip, my board is laid out just like the PropStick:

    DB9.2 to 3232.7
    DB9.3 to 3232.8
    DB9.4 to 3232.13
    3232.9 to Prop.A31
    3232.10 to Prop.A30 - pulled high

    Could using the 2N2222A instead of the 2N3904 cause a problem?

    I'll try anything you suggest.· Remember I'm using a built up PC board.

    Sid

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    Chip Gracey
    Parallax, Inc.
  • cgraceycgracey Posts: 14,133
    edited 2006-06-16 20:59
    I just checked and the pinouts of the 2N2222 and 2N3904 are 180 degrees different. You need to plug those 2N2222's in backwards!

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    Chip Gracey
    Parallax, Inc.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2006-06-16 22:13
    Hey Chip,

    This could be a little confusing. If he's using a true 2N2222 (in the metal can), you're right: the pinout is reversed. But if what he's actually using is a PN2222 (TO-92), it has the same pinout as the 2N3904 (i.e. EBC, flat side up, pins down).

    -Phil
  • NewzedNewzed Posts: 2,503
    edited 2006-06-16 22:27
    Thanks, Chip.· Problem solved.· I installed a 2N2222A - in a metal can,
    TO-18, I think.· Couldn't find a data sheet for a TO-92.

    Sid

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    Sid Weaver
    Do you have a Stamp Tester yet?
    http://hometown.aol.com/newzed/index.html

    ·
  • NewzedNewzed Posts: 2,503
    edited 2006-06-16 23:12
    Finally found a data sheet for the 2N2222A in a TO-92 -· I had it installed correctly.· Must have been a bad transistor.

    Sid

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Sid Weaver
    Do you have a Stamp Tester yet?
    http://hometown.aol.com/newzed/index.html

    ·
  • RinksCustomsRinksCustoms Posts: 531
    edited 2006-06-18 05:17
    yeah, bad transistor stuff happens in EE (Electronics Engineering)
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