DrBunsen Posted September 30, 2007 Report Share Posted September 30, 2007 PING)))$29.95 in the US. From Parallax (makers of the Basic STAMP and Propeller mCUs) Sensors page.just one I/O pin./ measures distance using sonar / Output / is a variable-width pulse that corresponds to the distance to the target./ a single (shared) I/O pin is use to trigger the Ping sensor and "listen" for the echo return pulse. /(edited) List of technical specifications:Range - 2cm to 3m (~.75" to 10')Supply Voltage: 5V +/-10%Supply Current: 25 mA typ; 30 mA maxNarrow acceptance angleInput Trigger - positive TTL pulse, 2 uS min, 5 uS typ. Echo Pulse - positive TTL pulse, 115 uS to 18.5 mSSize - 22 mm H x 46 mm W x 16 mm D (0.85 in x 1.8 in x 0.6 in)Might be an alternative option to the Sharp IR sensors, with less chance of false triggering (maybe) Quote Link to comment Share on other sites More sharing options...
audiocommander Posted October 1, 2007 Report Share Posted October 1, 2007 Hello Doctor,interesting topic, this one :)I experimented once with ultrasonic sensors and found them relatively complicated:- they have to be fixed very caryfully and embedded somewhere where no possible vibrations may occur, else there are wrong readings- dunno if the TTL-communication is really "a snap" ??? - to create pulses to trigger the signal and read back those pulses seems quite complicated to me (in terms of digitizing this signal ... but I have no experience in that). IIRC I have seen an ultrasonic I2C device somewhere lately - can't remember where - this would be a bit nicer, I guess...All in all, I found the longest range (1.5 m; effective range ~1m) IR-Distance sensor a bit easier to deal with (so far) - but it's just my 2c, I'd be interested to hear other experiences...Best,Michael Quote Link to comment Share on other sites More sharing options...
cimo Posted October 1, 2007 Report Share Posted October 1, 2007 heywhat about interferences with the audio signal ? These devices can sometime produce frequencies on the audible range.. do you own one? could you check that out ? thanksi remember we had a tv remote control ultrasonic device at home during the 80s and my mother could change the tv program by washing metallic pots :) and you could clearly hear some very high frequencies while pushing the buttonssimone Quote Link to comment Share on other sites More sharing options...
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