user19320: I would like to measure water turbidity in the sea. The sensor does not need to measure it in an accurate way, I just need to know if water is clear or very turbided. I know that there could be used a light scatter but I do not know what kind of sensor should I use. Could anyone help how to measure turbidity?

user43550: I used an array of cheap light dependent resistors hermetically sealed and used a torch. For dark water, it clearly shows a lower value than for cristal water. It is kind of a binary sensor, but I was proud of my basic invention!

user10394: http://uk.farnell.com/ams/tsl257-lf/sensor-light-voltage-converter/dp/1226886
is a good one according to http://forum.arduino.cc/index.php?topic=299993.0
But it might be easier to buy a COTS sensor, its a bit more expensive but much easier.  http://www.aliexpress.com/item/Turbidity-Testing-Sensor-Module-Suite/1903197650.html?spm=2114.01010208.3.17.OSVwdj&ws_ab_test=searchweb201556_9,searchweb201602_2_10017_9868_10005_10006_10034_10021_507_10022_10020_1000020_10018_10019,searchweb201603_8&btsid=6dbcca61-3e0a-4e34-9359-a6c26b268509
BTW for everyone else Turbidity is the amount of muck in the water, so it would be no good looking at the crystal clear waters off the UK coast :)

19320: <p>I would like to measure water turbidity in the sea. The sensor does not need to measure it in an accurate way, I just need to know if water is clear or very turbided. I know that there could be used a light scatter but I do not know what kind of sensor should I use. Could anyone help how to measure turbidity?</p>
 43550: <p>I used an array of cheap light dependent resistors hermetically sealed and used a torch. For dark water, it clearly shows a lower value than for cristal water. It is kind of a binary sensor, but I was proud of my basic invention!</p>
 10394: <p><a href="http://uk.farnell.com/ams/tsl257-lf/sensor-light-voltage-converter/dp/1226886" rel="nofollow">http://uk.farnell.com/ams/tsl257-lf/sensor-light-voltage-converter/dp/1226886</a>
is a good one according to <a href="http://forum.arduino.cc/index.php?topic=299993.0" rel="nofollow">http://forum.arduino.cc/index.php?topic=299993.0</a></p>

<p>But it might be easier to buy a COTS sensor, its a bit more expensive but much easier.  <a href="http://www.aliexpress.com/item/Turbidity-Testing-Sensor-Module-Suite/1903197650.html?spm=2114.01010208.3.17.OSVwdj&amp;ws_ab_test=searchweb201556_9,searchweb201602_2_10017_9868_10005_10006_10034_10021_507_10022_10020_1000020_10018_10019,searchweb201603_8&amp;btsid=6dbcca61-3e0a-4e34-9359-a6c26b268509" rel="nofollow">http://www.aliexpress.com/item/Turbidity-Testing-Sensor-Module-Suite/1903197650.html?spm=2114.01010208.3.17.OSVwdj&amp;ws_ab_test=searchweb201556_9,searchweb201602_2_10017_9868_10005_10006_10034_10021_507_10022_10020_1000020_10018_10019,searchweb201603_8&amp;btsid=6dbcca61-3e0a-4e34-9359-a6c26b268509</a></p>

<p>BTW for everyone else Turbidity is the amount of muck in the water, so it would be no good looking at the crystal clear waters off the UK coast :)</p>
