Shop OBEX P1 Docs P2 Docs Learn Events
Centigrade to F conversion — Parallax Forums

Centigrade to F conversion

ArchiverArchiver Posts: 46,084
edited 2003-04-01 00:31 in General Discussion
Hi All,

I am making a device for a friend using a SHT11 sensor. He can't deal with
centigrade, so I have to convert it into degrees F. Tracy's site has a F to
C conversion, but no C to F. I know I should be able to switch it, but I am
simply too dim to do it. .1of a degree C would be fine resolution.

Thanks for any and all help!

Jonathan

www.madlabs.info

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-03-30 21:45
    ( C x 9 / 5 ) + 32


    --- In basicstamps@yahoogroups.com, "Jonathan Peakall"
    <jpeakall@m...> wrote:
    > Hi All,
    >
    > I am making a device for a friend using a SHT11 sensor. He can't
    deal with
    > centigrade, so I have to convert it into degrees F. Tracy's site
    has a F to
    > C conversion, but no C to F. I know I should be able to switch it,
    but I am
    > simply too dim to do it. .1of a degree C would be fine resolution.
    >
    > Thanks for any and all help!
    >
    > Jonathan
    >
    > www.madlabs.info
  • ArchiverArchiver Posts: 46,084
    edited 2003-03-31 04:15
    Jonathan,

    Here are the formulas:

    °C =(°F - 32) / 1.8

    and

    °F = (°C x 1.8) + 32

    Have fun,

    Aaron

    Original Message
    From: Jonathan Peakall [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=_gO_LPv-B5QSshGsGcxbK0Lw_K-O3XmrCWscSyDsnJHN8nNPepOdEH1uTFOyIu0LxfPrNJWqv6r20tTk]jpeakall@m...[/url
    Sent: Sunday, March 30, 2003 10:47 AM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Centigrade to F conversion


    Hi All,

    I am making a device for a friend using a SHT11 sensor. He can't deal
    with centigrade, so I have to convert it into degrees F. Tracy's site
    has a F to C conversion, but no C to F. I know I should be able to
    switch it, but I am simply too dim to do it. .1of a degree C would be
    fine resolution.

    Thanks for any and all help!

    Jonathan

    www.madlabs.info



    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
    from the same email address that you subscribed. Text in the Subject
    and Body of the message will be ignored.


    Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2003-03-31 22:01
    >Hi All,
    >
    >I am making a device for a friend using a SHT11 sensor. He can't deal
    >with centigrade, so I have to convert it into degrees F. Tracy's site
    >has a F to C conversion, but no C to F. I know I should be able to
    >switch it, but I am simply too dim to do it. .1of a degree C would be
    >fine resolution.
    >Thanks for any and all help!
    >Jonathan
    >www.madlabs.info


    Hi Jonathan,

    If you are using the programs I posted for the SHTxx, then
    temperature will come out in tenths of a degree Celsius. E.g., 205
    for 20.5 degrees C.

    You can use the formula F= C *9/5+32, adjusted for tenths:

    degC=205 ' example 20.5 degrees C input
    degF=degC*9/5+320 ' degF and degC in tenths of degrees
    debug dec degF/10,".",dec1 degF ' displays 68.9 degrees F output

    Caveat, the programs have to be modified if you expect Celsius
    temperatures less than zero....

    ' if temperatures can be less than zero...
    degC=-205 ' example -20.5 degrees C input (word)
    sign=degC.bit15 ' bit variable
    degF=-sign^(abs degC*9/5)+320 ' degF and degC in tenths of degrees
    sign=degF.bit15
    debug rep "-"\sign,dec abs degF/10,".",dec1 abs degF
    ' displays -4.9 degrees F output


    -- Tracy
    electronically monitored ecosystems
    http://www.emesystems.com
    mailto:tracy@e...
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-01 00:31
    F = C * (9/5) + 32
    C = (F-32)*5/9


    On Sun, 30 Mar 2003, Jonathan Peakall wrote:

    > Hi All,
    >
    > I am making a device for a friend using a SHT11 sensor. He can't deal with
    > centigrade, so I have to convert it into degrees F. Tracy's site has a F to
    > C conversion, but no C to F. I know I should be able to switch it, but I am
    > simply too dim to do it. .1of a degree C would be fine resolution.
    >
    > Thanks for any and all help!
    >
    > Jonathan
    >
    > www.madlabs.info
    >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and Body
    of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
    >

    Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
    Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
    email: lamont@a... WWW: http://www.serv.net
    "Do not fear mistakes, There Are None" - Miles Davis
Sign In or Register to comment.