Unihedron SQM-LU, Руководство пользователя

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Unihedron SQM-LU Users manual
1 Theory of operation
The SQM-LU measures the darkness of the night sky to provide readings of magnitudes per square arc
second through a USB connection.
A light sensor (TSL237) provides the microcontroller with a light level, and readings from the
temperature sensor are used to compensate the light sensor readings for various operating temperatures.
Commands sent from a PC through the USB cable to the USB interface are relayed to the
microcontroller.
The microcontroller responds to commands by sending data strings to the USB interface which are then
relayed to the PC.
1.1 Quick start
1.
Your computer must have the FTDI VCP driver installed. You can get the most updated driver
for your operating system from here:
http://ftdichip.com/Drivers/VCP.htm
2.
If you are using Windows, then download and install the latest Knightware SQM-Reader from
www.knightware.biz/sqm . Follow the instructions for installing and using that software.
3.
If you are using Windows, Linux, or Mac, you can use the Perl scripts supplied on the CD.
Revision 1.1 Page 3 Last modified: Jun 18, 2011
Illustration 1: SQM-LU block diagram