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A school in Samambaia, a city next to Brasília, is testing a controversial sensor in the uniform to control the student attendance.
Pedro V
Pedro V May 08, 2013
A school in Samambaia, a city next to Brasília, is testing a controversial sensor in the uniform to control the student attendance.

I've seen these sensors...

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Similar Photos: With the increased bicycle ridership in Columbus, they are implementing sensors for traffic lights (similar to those for cars) Sensors for Smart Cities - nice inspiration<br/><br/>some more : http://www.libelium.<wbr/><span class="wbr"></span>com/top_50_iot_senso<wbr/><span class="wbr"></span>r_applications_ranki<wbr/><span class="wbr"></span>ng#show_infographic Sensors for traffic conditions, highway and lane closures to send to people about their daily commutes.  I see them used for tracking speed.

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