Open Turbidimeter Project

Dual Sensor Layout

Registered by Alex Krolick on 2012-09-23

Add another sensor at 180 degrees to the light source, so that 90 degree refraction can be compared to the pass-through intensity. Software needs to be updated to derive NTU as a function of the percent-refraction rather than absolute refraction.

Blueprint information

Status:: Complete

Approver:: None

Priority:: Medium

Drafter:: Alex Krolick

Direction:: Approved

Assignee:: None

Definition:: Discussion

Series goal:: Accepted for hardware

Implementation:: Implemented

Milestone target:: 0.2

Started by: Alex Krolick on 2012-09-23

Completed by: Alex Krolick on 2012-11-06

Related branches

lp:open-turbidimeter-project/hardware

Related bugs

Sprints

Whiteboard

The current sensor setup calls for 2 perpendicular TSL2561's [http://www.adafruit.com/products/439]. The second sensor arrived but didn't work; a replacement is coming but reliability is questionable. We'll have to evaluate some alternatives.

Also, the 90_reading/180_reading measurement might be the wrong thing to look at; perhaps the results should be subtracted or something. Hardware testing will help.

(?)

Work Items

Work items:
Code: DONE
Test Hardware: POSTPONED

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