Re: night sky meter project needs SX programmer

From: Steve Taylor (steve_at_thetaylorfamily.org.uk)
Date: 08/16/04 

Date: Mon, 16 Aug 2004 18:11:17 +0100

Dan McKenna wrote:

>
> So far tests of the TSL237 show a wide variation in performance as far as
> noise, dark offset, and dark frequency temperature coefficient.
> Some device have a stable enough dark temp coeff that compensation is not
> needed.
> So far that 2 devices out of 20.
>
> A temperature calibration feature will be used if needed

I'm afraid its looking pretty mandatory. The CPU I was looking at didn't
have a suitable on-board DAC unfortunately. The new (si-labs) one does.
A thermistor bead can be built in the sensing head easily enough.

The whole unit is only a bit bigger than a credit card ! There is an
RS232 connection for extracting data and ugrading the firmware.

The CPU has enough horsepower that it COULD have its own TCP/IP
stack......MkII

Steve

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