Revision as of 04:40, 26 August 2016

Requirements

1mm accuracy optimal, 3 mm is absolute max
Open source version of http://www.cnccontrols.com/thcontrol.asp - 20-250 mm range for pointing to metal, with no obstructions

Maxbotics - 1 mm resolution options, not water protected - 12" minimum distance - $40 - [3]. Adafruit has it.
Microptik - 3 mm resolution - http://www.micropik.com/PDF/HCSR04.pdf - 2-400 cm range - services@elecfreaks.com. Sample Arduino sketch - [4]
HC-SR04 - appears to get 3 mm accuracy - [5]. Sparkfun has the sensor + code - [6]

Video shows 15 cm measurement, with oscillation +- 1mm - and text says well within 2% accuracy. 2% of 15 cm is 3 mm - so this would do for measurements of torch height for 1/2" steel easily (12 mm thickness).

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 *Microptik - 3 mm resolution - http://www.micropik.com/PDF/HCSR04.pdf - 2-400 cm range - services@elecfreaks.com. Sample Arduino sketch - [http://www.elecfreaks.com/244.html]
 *HC-SR04 - appears to get 3 mm accuracy - [https://www.youtube.com/watch?v=-1SDVVepaP8]. Sparkfun has the sensor + code - [https://codebender.cc/sketch:356078#HC-SR04%20Ultrasonic%20Sensor%20Example.ino]
+:*Video shows 15 cm measurement, with oscillation +- 1mm - and text says well within 2% accuracy. 2% of 15 cm is 3 mm - so this would do for measurements of torch height for 1/2" steel  easily (12 mm thickness).
 =Comparisons=