Engineering
General Multiport Unit - mini (GMU-mini)
November 24, 2018
This minimal valve sequencer is equipped with a serial connection and can switch up to 8 valves.
The system is driven by a raspberry Pi zero. CAD drawings, switchboard plans and python code is available.
Its an open source solution for research purposes, cheap reliable and open source!
The casing can be printed with a 3D-printer.
A publication is in preparation. However if you are interested dont hesitate to contact me.
General Multiport Unit - 16 ports (GMU-16)
August 09, 2017
This minimal valve sequencer is equipped with a serial connection and can switch up to 16 valves.
The system is driven by a raspberry Pi B+. Digital outputs can be extended because of I2C connections. Bürkert valves with a minimum of volume ensure fast response during vapor sampling. This reduces memory effects for stable isotopic analysis.
Field deployable isotope sampler
September 03, 2016
The control unit of this autosampler is a RaspberryPi (model B+). The graphical user interface and the control sequences are written with Pyhton. The serial interface allows communication with the LGR DLT-100. Full automation of the vapor sampling in the field with minimum maintainance.
The python code is open source and will be ready for download soon.
The plant test stand
March 31, 2018
This experimental setup is unique, in that the design allows complete control of the isotopic composition of all the water and water vapour inputs into the experimental enclosures and the isotopic composition of any outputs are measured in real-time using an on-line laser spectrometer. The soils are monitored for tension, moisture and temperature and the team can monitor what the tree is up to by measuring sap flux and changes in stem diameter. The team anticipates that this level of monitoring and control will provide new insight into fractionation mechanisms at the root-soil interface