Process: Build Moisture Sensor Proto-FD for John and Optical soil moisture sensor prototype starting 2015-09-24 ending 2015-11-10

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Outputs

Scheduled:

Optical soil moisture sensor prototype 1.00 Each due Nov. 10, 2015

Proto-FD

Completed: produces 1.00 Each Oct. 13, 2015
  Resource: Optical soil moisture sensor prototype: Prototype documentation 1.00 Each

Work

Planned Work: (Requirements are ordered by due date)

Technician experimental work: 2.00 Time - Hours due Sept. 24, 2015

Build and test second moisture sensor prototype Proto-FD for John.

Taken by Frederic
Work events:
Nov. 10, 2015 1.00 Time - Hours Done by Frederic

Documenting results of 2-week long test.

Nov. 8, 2015 3.00 Time - Hours Done by Frederic

Assembly of QTY=2 prototypes.

Oct. 26, 2015 2.00 Time - Hours Done by Frederic

Documenting initial test results.

Oct. 23, 2015 2.00 Time - Hours Done by Frederic

initial testing of FD-prototype.

Oct. 18, 2015 1.00 Time - Hours Done by Frederic

Documentation, published status on Sensorica web site.

Oct. 14, 2015 1.50 Time - Hours Done by Frederic

Initial testing.
Signal output measured with DVM. Depending on facing material, signal measured between 1.2V and 0.400V.
With probe in air, signal is 400mV with LED current set at 100mA. Signal decreases in proportion of LED current. Signal is very stable, +/-1mV over ~5 minutes.

Oct. 13, 2015 1.00 Time - Hours Done by Frederic

Documenting prototype

Sept. 25, 2015 1.00 Time - Hours Done by Frederic

Gathering components: LED driver, PD circuit, bifurcated Y fiber bundle.

Citations

Optical soil moisture sensor prototype

Process context:

Pattern: Generic R&D
Context: soilsensor
Order: Work order 178 due: 2015-11-10

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