Design a low cost water sensor unit to measure •Water clarity (Turbidity between 5 NTU and 250 NTU)

Objective; Design a low cost water sensor unit to measure; • Water clarity (Turbidity between 5 NTU and 250 NTU) This sensor / unit is to be deployed long term in a river. To provide a spot turbidity reading every 15 Minutes. Be connected to an Arduino / raspberry Pi and a 3G GPRS to upload data to a web domain What I Require; Require circuit diagram and unit schematic so as I can use to contact manufacturers to develop prototype. What I Suggest; Refer to “Sketch 01” on following page which uses; • TSL267 HIGH-SENSITIVITY IR LIGHT-TO-VOLTAGE CONVERTER • IR Laser Diode • Voltage reader • Arduino • Raspbery Pi • 3G GPRS • Solar panel powered battery Require your input for types of cables / battery voltage AC/DC Note: Open to your expertise on the issue / design. Please feel free to recommend other diodes / methods etc which you think would suit my needs better. Again this is for long term deployment so needs to be a robust and reliable unit. Have been informed that infrared laser emitting and detecting diodes will be less affected by ambient light. Open to your expertise to advise different if applicable