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NginX redirect to Facebook

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This is my live example of permanent (301) redirection to external URL with Nginx, all incoming requests will be redirected to a Facebook group.

cat /etc/nginx/sites-enabled/domain.de

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server {
        server_name  domain.de www.domain.de;
	listen   [::]:80;
	server_tokens off;
 
location / {
	rewrite ^ http://www.facebook.com/groups/399191/ permanent;
}
 
}

Arduino SRF08

by 4 Comments

The speed of the sound in the dry air (20° C) is around 343 m/s. Send a short ultrasonic pulse at Frequency of 40Khz in the air, and try to listen to the echo. Of course you won’t hear anything (only a little click noise), but with an ultrasonic sensor the back pulse can be detected. If you know the time of the forth & back travel of the ultrasonic wave, you know the distance, divide the distance by two and you know the range from the ultrasonic sensor to the first obstacle in front of it.
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