Rain Gauge Retrofit

Current rain gauges store data in physical form, requiring an individual to laboriously convert data to electronic form so that it can be stored and analyzed by a computer. The rain gauge retrofit entails modifying current rain gauges throughout the northwest to store data in electronic form from the start, saving time and money for the US forest service.

Background
Why make a conversion for rain gauges?
 * Currently, each rain gauge requires an individual to laboriously convert data on a piece of paper to data in programs such as excel. There are many of these gauges throughout the world, and most still rely on the older designs utilizing paper rolls. Converting the initial data collection to electronic form could save on quite a bit of man-hours, allowing the forest service to use those man-hours elsewhere.

Current methods
 * There are many small variations in design, but they all work on one basic premise: physical movement of an actuator arm, combined with an internal tension spring. Calibration is relatively simple: the recording paper is marked to give reference numbers regarding rainfall in fractions of an inch, and the system is balanced using various sets of weights until the actuator arm accurately reflects real rainfall amount.

Specifications
Team Rainmen Specifications

Deliverables
Working Retrofitted Rain Gauge

Development to date:


 * Transferring Displacement to Potentiometer
 * We have located where to attach our system to the existing rain gauge, ordered all the   gears we need, and created a working mock-up of the transfer system. The final prototype will be completed before the end of 2014.


 * Potentiometer
 * We have bought, tested, and verified that our current potentiometer meets all specifications required by our project. Details can be found in Project Learning.


 * Data Logger
 * We have a datalogger that meets all our specifications, and is already configured with arduino software to give us real-time data on voltage and rainfall levels


 * Energy Storage
 * Preliminary analysis on energy needs has already been performed; details can be found in the Project Learning section.


 * Electrical Component Housing Unit
 * Final decisions on the housing unit have been made, with products arriving in mid December. Waterproof ABS plastic project boxes fit our specifications while also allowing for easy modification to give more freedom with where we mount our components.

3D modeled rain gauge with retrofit
 * In Project Learning we have the results of our 3D modeling, which clearly shows that plenty of room exists within current rain gauges for our retrofit design.

Data & control flow diagrams
 * Both of these diagrams are finished and can be seen in Project Learning.

Potentiometer & data logger calibrations
 * Final calibration will be performed when we have the components needed to assemble our final prototype. Spring 2015 will primarily consist of gathering calibration data in a variety of weather conditions.

User Manual
 * The user manual is currently composed of electrical and mechanical portions.
 * [[Media:manual.pdf|Electrical Engineering Manual]]

Project Learning
Electrical Engineering

Noise Analysis
 * Noise analysis was performed on multiple potentiometers to determine viability.
 * [[Media:noise_analysis.pdf|Analysis and Report]]

Validating Rotary Potentiometer
 * Having selected the rotary potentiometer to move forward with design we needed to validate its range of operation and maximize the useable range.
 * [[Media:Validating_Potentiometer.pdf|Analysis and Report]]

Power Analysis
 * In order to select a usable power system the current of the system must be measured and minimized. Experiments were performed and future experiments are planned.
 * [[Media:current_draw.pdf|Analysis and Report]]

Operation/Control Diagrams
 * [[Media:diagrams.pdf|Diagrams]]

Mechanical Engineering Design Possibilities

Document Archive
Team Rainmen Contract

Team Rainmen Calendar

Availability Chart

Rainmen Roadmap