Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: Yr0gErG on September 30, 2010, 02:28:43 AM
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Hi I would like to know certain applications for this particular sensor. I'm currently thinking of using this sensor in conjunction with a p18f4520 PIC microcontroller to detect a white block of dimensions 100mmX100mmX40mm at distances of 150mm, 350mm and 550mm. Will this sensor be able to perform such a task and to what accuracy? Is there anything to take note of when installing/mounting this sensor? Can i put this sensor close to a surface, like placing it a few cm over a robot base?
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Sounds like it should work, atleast up to the 350mm. The 550 mm you may experience a bit of jitter though. I just mocked up that setup with my ultrasonic sensor (and AVR micro) and a chunk of wood approx 100mm cubed at home. It was good for the 150mm distance, the 350mm distance and the 550mm distance it started some jitter.
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Can i put this sensor close to a surface, like placing it a few cm over a robot base?
Remember the signal spreads out in a cone shape (like this < ). If you are too close to a surface you can get inaccurate readings. A simple solution is to tilt the sensor upwards so that the bottom of the cone is approx parrallel to the surface. (Like this /_ ). You shouldn't have to tilt it much ( No more than about 1/2 the beamwidth).
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Just make sure its on the front of your robot, and facing perfectly parallel to the object. Perhaps an IR rangefinder would be better for your needs.
p.s: don't try to make your own ultrasonic sensor. I tried it, and utterly failed.