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hi, i need advices on how to make a low cost distance measurement sensor. the measurement range will be from 3 cm to 20cm. it will be best if the sensor is robust and almost immune to the external noise of the environment. thanks in advance
You better use ultrasonic ranging module HCSR04
Use the following link for datasheet
http://jaktek.com/wp-content/uploads/2011/12/HC-SR04.pdf
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