Project:LHS Graphs and Visualizations: Difference between revisions
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Project:LHS Graphs and Visualizations (view source)
Revision as of 16:17, 6 February 2011
, 6 February 2011→Location
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=====Location===== | =====Location===== | ||
The current mounting location has the lasers In close proximity in the middle of the entrance way. To avoid issues with occlusion of beams by coats etc, the coat hooks have been moved to the next wall along, with the lab coats. This arrangement greatly simplifies the detection of the true direction of someone entering/leaving the space. | |||
Detection works reasonably well but there is currently a reset delay of 1 second meaning that a person following another at an interval at less than one second will not be detected. It turns out that this is quite common and leads to 'under-counting'. | |||
The occupancy level is currently [http://hack.rs/cacti/graph.php?action=view&local_graph_id=35&rra_id=all charted on cacti]. The [https://github.com/londonhackspace/spacensus python script] that provides the data to cacti implements only the 'pool for status' command, but will later allow more control and configuration of the counting sensors. | |||
=====Hardware===== | |||
These sensors appear to be in working order. They'd should be safe to use below child-head height. They were manufactured in 1996 and use a [http://en.wikipedia.org/wiki/Laser_safety#Class_II Class II] laser rated at 3mW with a wavelength of 655-670nm ([[Media:Banner-q45bb6ll.pdf|datasheet]]). The model number is: Q45BB6LL | These sensors appear to be in working order. They'd should be safe to use below child-head height. They were manufactured in 1996 and use a [http://en.wikipedia.org/wiki/Laser_safety#Class_II Class II] laser rated at 3mW with a wavelength of 655-670nm ([[Media:Banner-q45bb6ll.pdf|datasheet]]). The model number is: Q45BB6LL | ||
