OPEnSampler
Hardware: Hadi Al-agele and Bao Nguyen
Software: Kawin Pechetratanapanit
Email: OPEnSampler@lists.oregonstate.edu
The OPEnSampler is an openly published water sampler capable of sampling from various sources into either mylar bags or hard plastic bottles. Printed circuit boards interface with an Feather M0 microcontroller to control an array of 24 solenoid valves, allowing the sampling containers to be sealed from the environment when they are done filling. The frame is assembled with Misumi's 15mm aluminum extrusion, cut to length by the manufacturer. The universal mounting system of aluminum extrusion allows users to add their own modifications to the sampler, such as sensors or additional mechanical components. The entire device fits in Pelican's 80QT Wheeled Cooler which retains ice for up to 10 days.
The first concept focused on including as many sample containers as possible in a given space. Bottles were arranged in a foam grid, a cheap peristaltic dosing pump was used to move water, and solenoid valves were controlled by an Arduino to direct the flow. The second design, use a bigger pump, 24 foil-lined bags, and smaller overall footprint.
The current design uses a rigid frame made with aluminum extrusion cut to length by an online supplier. Custom PCBs were designed and soldered using reflow oven. The code is redesigned by Kawin with local host web application, where user can access wirelessly with any decide. Operator can configure the machine via wifi without touching the code. Hardware interface is simplified down just to one switch to toggle between automation/manual operation.
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- Max pump rate: 0.6 L/min
- Microcontroller: Feather M0 Wifi
- 24 foil-lined bags, store up to 250mL - 5.80L total
- Mechanical support + Lock for bag
- Push-to-connect action for bags and other hydraulic
- Access Point - Web Server interface with any device (PC, MAC, Android, iOS) without extra App
| Brand New Browser Application |
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Note: This is the interface of eDNA Sampler. The OpenSampler interface will be modified for less sensor and steps
- The OPEnSampler was designed to allow direct customization by the user when choosing different sensor for data logging purpose.
- Preserve the low cost of DIY samplers in addition to the wide range of applications of many commercial samplers.
The goal of this project is to have it grow on its own; we want you to help develop it. By publishing the design, code, and instructions, we will enable others to add their own modifications to fit their applications with minimal effort. We will serve as the hub of activity, sharing new developments publicly so that a database of ways to use the OPEnSampler and how to modify it to fit specific needs can be viewed by anyone working on similar projects around the world.
The current update include:
- Adafruit M0 Feather Wi-Fi board
- Modular PCB design for easier troubleshoot and replacement
- Ability to communicate/set up/modify task wirelessly
- Implement OPEnSPower 7.3 – Low power sleep mode
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No external sensors are currently used
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No data currently available.
- No tutorials currently available.
OPEnSampler. Water Sampler. 3D Printing. Customizable Instrument. Arduino. eDNA. Power module. Logic Module
The studies linked below, conducted by the EPA in the 70's and 80's, form the basis of the decisions behind qualities of many commercial samplers. We also based many of our design criteria on the discussion of ideal water sampler characteristics. The EPA's studies are also great references for how to collect and store samples in the field to achieve the best results.
[1] United States Environmental Protection Agency, (1982). Handbook for Sampling and Sample Preservation of Water and Wastewater. Cincinnati, OH, EPA. [Accessed Nov 20, 2017].
[2] Harris and Keffer, United States Environmental Protection Agency, (1974). Wastewater Sampling Methodologies and Flow Measurement Techniques [Accessed Nov 20, 2017].
[3] United States Environmental Protection Agency, (1977). Sampling of Water and Wastewater. Cincinnati, OH, EPA. [Accessed Nov 20, 2017].