https://learn.adafruit.com/quadcopter-spray-can-mod/sonar-sensor-cables
Sonar sensor cables | Quadcopter Spray Can Mod | Adafruit Learning System
Use some electronics and either parts from your local hardware store or 3D printer to make your quadcopter paint with a spray can!
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https://lists.ros.org/pipermail/ros-users/2010-October/058790.html
[ros-users] Ranger (Sonar/IR) message added to sensor_msgs?
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