Thanks for your help, my point of confusion was the changing around of
the ratio which
was not intuitive to me.
In case anyone else (like me) needs a more explicit explanation, the
equation is simply
a ratio (using S1087):
Isc = Short Circuit Current
1 lx / I = 100 / Isc
1 lx = 1 / Isc * I * 100
= 1 / (.16 * 10e-6) * I * 100
= (1 / .16 ) * (1 / 10e-6) * I * 100
= .625 * 10e6 * I * 100
= .625 * 10 * 1e6 * I * 100
= .625 * 1e6 * I * 1000
Thanks again Rob,
Frank
Robert Szewczyk wrote:
The values from the S1087 and S1087-1 datasheets: The constants come
from the table on the first page of the datasheet, where the
manufacturer lists the current output at 100 lux.
Best regards,
Rob
On 9/11/07, Frank Maker <[EMAIL PROTECTED]> wrote:
Hello,
I'm working with a set of MoteIV Tmote Sky motes and I'm wondering if
anyone can explain how
the light sensor conversions are derived from the datasheet for the
light sensor
(S1087 & S1087-01)on their website:
S1087 lx = 0.625 * 1e6 * I * 1000
S1087-01 lx = 0.769 * 1e5 * I * 1000
From: http://www.moteiv.com/community/Getting_Data_from_Tmote_Sky's_Sensors
I've looked over the datasheet many times and I'm confused about where
the first scaling factors
(i.e. 0.625 & 0.769) come from?
Thanks,
Frank Maker
[EMAIL PROTECTED]
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