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3 questions — Parallax Forums

3 questions

ArchiverArchiver Posts: 46,084
edited 2002-03-15 02:23 in General Discussion
Hello all,
I am currently working on a stamp driven project that
has backed me into corner a bit:
1)
I need some liquid solenoid valves for a gravity fed
system, problem is I can't find the little buggers
anywhere for less than around $35-50+ per (grainger,
mcmaster-carr, jameco, american sci & surplus, etc.)
and I need 12-16 of them. Way too pricey. I am at
the point where I am just gonna build my own(I've got
a semi working prototype done at about $10), unless
someone knows of some surplus website I have not found
yet? Gotta be cheap ones somewhere!!!! I hope [noparse]:)[/noparse]
2)
I've never used a RAM chip yet, but I know I have read
people talking about RAM chips before, anyone have any
preferences to a certain chip, or code fragments they
would like to share??
3)
Is anyone familiar with measureing volumes of a fluid
via its capacitance? I believe some rain guages work
that way???

Thanks in advance,
Ross Cooper

__________________________________________________
Do You Yahoo!?
Yahoo! Sports - live college hoops coverage
http://sports.yahoo.com/

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-03-14 18:31
    Hello all,
    I am currently working on a stamp driven project that
    has backed me into corner a bit:
    1)
    I need some liquid solenoid valves for a gravity fed
    system, problem is I can't find the little buggers
    anywhere for less than around $35-50+ per (grainger,
    mcmaster-carr, jameco, american sci & surplus, etc.)
    and I need 12-16 of them. Way too pricey. I am at
    the point where I am just gonna build my own(I've got
    a semi working prototype done at about $10), unless
    someone knows of some surplus website I have not found
    yet? Gotta be cheap ones somewhere!!!! I hope [noparse]:)[/noparse]
    2)
    I've never used a RAM chip yet, but I know I have read
    people talking about RAM chips before, anyone have any
    preferences to a certain chip, or code fragments they
    would like to share??
    3)
    Is anyone familiar with measureing volumes of a fluid
    via its capacitance? I believe some rain guages work
    that way???

    Thanks in advance,
    Ross Cooper

    __________________________________________________
    Do You Yahoo!?
    Yahoo! Sports - live college hoops coverage
    http://sports.yahoo.com/
  • ArchiverArchiver Posts: 46,084
    edited 2002-03-14 18:53
    FOR KLUTCH

    Try your local lawn irrigation company. Their solenoids to control water are
    pretty cheap.

    Sid




    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2002-03-15 02:23
    A simple method is to use a regular solenoid and have it press against or
    unpress against a piece of surgical tubing. It pinches the tubing to cut off
    the flow.
    Not a lot of maching to do for that.
    You can also use a inexpensive gear crank motor (like the one Tamiya makes
    or better), and have it pinch off a piece of rubber tubing as well.
    A RC model airplane servo would also work too.


    Original Message
    From: Klutch [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=xxd6yzq9WP-lSiCUnms_AI2kTV0wTW8qG_m6a6GhfZNSsfWHTOfoOR1wlkQjRMu0ykSfFm7ko1ZrKw]klutch66@y...[/url
    Sent: Thursday, March 14, 2002 12:31 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] 3 questions


    Hello all,
    I am currently working on a stamp driven project that
    has backed me into corner a bit:
    1)
    I need some liquid solenoid valves for a gravity fed
    system, problem is I can't find the little buggers
    anywhere for less than around $35-50+ per (grainger,
    mcmaster-carr, jameco, american sci & surplus, etc.)
    and I need 12-16 of them. Way too pricey. I am at
    the point where I am just gonna build my own(I've got
    a semi working prototype done at about $10), unless
    someone knows of some surplus website I have not found
    yet? Gotta be cheap ones somewhere!!!! I hope [noparse]:)[/noparse]
    2)
    I've never used a RAM chip yet, but I know I have read
    people talking about RAM chips before, anyone have any
    preferences to a certain chip, or code fragments they
    would like to share??
    3)
    Is anyone familiar with measureing volumes of a fluid
    via its capacitance? I believe some rain guages work
    that way???

    Thanks in advance,
    Ross Cooper

    __________________________________________________
    Do You Yahoo!?
    Yahoo! Sports - live college hoops coverage
    http://sports.yahoo.com/

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