Wiring, Javascript, and ROS

The previous screencast (giving more background on the rosbridge protocol), can be viewed here:

http://www.youtube.com/watch?v=kaiwwaqH9jA

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More information on the Ping sensor (including the timing diagram shown in the video) is available on Parallax's product page for the Ping here:

http://www.parallax.com/tabid/768/ProductID/92/Default.aspx

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To wire the Ping as in the video, the connections are:

Ping  Arduino
GND<--->GND (either will do)
5V <--->5V
SIG<--->12

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The code for the Wiring sketch written in the video can be found here:

http://pastebin.com/BDHVEPbw

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The HTML page written in the video can be found here:

http://pastebin.com/V1fEemg4

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Assuming your Arduino is connected to /dev/ttyACM0, you can run the project featured in the video by:

1) connecting the Ping sensor to your Arduino as described
2) uploading the supplied sketch to the Arduino board
3) starting a roscore
4) starting rosbridge
5) running the command:

socat /dev/ttyACM0,ignoreeof - | sed -u -e '1,1 s/^.*/raw\r\n\r\n/' -e '1! s/\([0-9]*\)/\x00{"receiver":"\/echoTime","msg":{"data":\1},"type":"std_msgs\/Int64"}\xff/' | nc localhost 9090

either in the background (via &) or in a dedicated terminal

6) opening the supplied web page in a web-socket enabled browser

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As always, you can always check out the latest rosbridge related tutorials and info at:

http://www.ros.org/wiki/rosbridge

or you can ask for help on IRC. #rosbridge is on the Freenode network.