3
$\begingroup$

I have an RSL Line Sensor which is designed to distinguish black and white lines. It detects white surface and gives me digital 1 as output, with 0 in case of black, but the surface needs to be close to it.

As it uses infra-red-sensors, I wanted to use this sensor as a proximity sensor, to tell me if there is a white surface near it. Is it possible to do this?

I think the only problem here is that we need to increase it's range of giving 1. Currently, it gives 1 only when white surface is too close to the sensors. I want 1 even if the white surface is there at a bit more distance.

Also there is an adjustable screw there to adjust something, under which POT is written. I am working with an Arduino.

$\endgroup$
  • $\begingroup$ Just out of interest, why do you particularly want to use this sensor as a proximity sensor? You can buy sensors which do what you want, like the Sharp GP2Y0A21YK (and its cheaper). $\endgroup$ – Rocketmagnet Sep 11 '14 at 20:05
  • $\begingroup$ i had a competetion and we were given this particular sensor. i was just wondering if i can use this sensor to detect walls at a distance. it's over now!! $\endgroup$ – nishantbhardwaj2002 Sep 12 '14 at 15:16
  • $\begingroup$ Anyway it's too late: you CAN'T use it in other way that line sensor (it just won't be reliable). $\endgroup$ – Marian Paździoch Sep 15 '14 at 11:57
  • $\begingroup$ Does the sensor produce something other than 0 or 1 if the surface is not close enough? $\endgroup$ – Ian Sep 16 '14 at 18:19
  • $\begingroup$ This is not very good answer. "reliable" needs to be qualified. I don't see any reason why a 0/1 sensor can't be used this way, assuming sensitivity can be increased as stated. A technical rebuttal or some insights would be a much better way to answer. $\endgroup$ – Josh Vander Hook Oct 6 '14 at 20:14
2
$\begingroup$

This would not be a good idea. As you can see in the specs of your sensor, it has a maximum range of 50mm. It's going to give you lots of faulty outputs if you try to use it for larger distances. My suggestion is to use a line sensor as a line sensor.

Three types of sensors are widely used as proximity sensors:

  1. IR sensors: Omits IR pulses and receives the reflection. The distance is calculated based on triangulation.

    • Pros:

      • Very Affordable.
    • Cons:

      • Not a good option for outdoors, because of high IR level in sunlight.
      • It has a noticeable lower range. For example, GP2Y0D21YK does not see obstacles closer than 10 cm.
  2. Sonar(ultrasonic) sensors: Sends sound pulses and receives the echo. The distance is calculated based on time of travel.

    • Pros:

      • Affordable.
      • Can be used in outdoor environment.
      • More accurate than IR sensor with less noise.
    • Cons:

      • Does not work very well with sound absorbing objects.
      • Might see ghost objects, because of receiving response after multiple reflections of the sound wave.
  3. LiDAR (laser range finder): Sends near IR, visible, or UV light pulses and measures the time of travel. The sensors come in one, two, and three dimensional.

    • Pros:

      • Very Accurate.
      • Works with a wide range of surfaces, outdoor or indoor.
    • Cons:

      • Not as affordable as the other two.
$\endgroup$
0
$\begingroup$

The sensors which you using as got just an comparator with a variable resistor to adjust the threshold to differentiate black and white line... Sensors with filters can you configured to find the distance from an obstacle which can be used as a proximity sensors .. Anyways proximity sensors are IR based sensors (you can verify using phones camera)...

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.