odour-stimulator

A fast, time precise open source system to deliver odours.

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References	Qty	Description	Manufacturer	MPN	Digikey
C1, C2	2	C Small 680pF Unpolarized capacitor, small symbol Disc D5.1mm W3.2mm P5.00mm	Vishay	K681K10X7RF5UH5	BC2690CT-ND
C3, C4	2	C Small 10nF Unpolarized capacitor, small symbol Disc D5.1mm W3.2mm P5.00mm	TDK corporation	FA18C0G2A103JRU06	445-175393-1-ND
C5, C6	2	C Small 10µF Unpolarized capacitor, small symbol Disc D5.1mm W3.2mm P5.00mm	AVX	TAP106M035SCS	478-6062-ND
C11	1	CP Small 680µF Polarized capacitor, small symbol Radial D10.0mm P5.00mm	Rubycon	35PX680MEFC10X16	1189-1282-ND
C15	1	CP Small 220µF Polarized capacitor, small symbol Radial D10.0mm P5.00mm	Panasonic	EEU-FM1V221	P12411-ND
D1, D5, D3, D2, D6, D4	6	1N4005 50V 1A General Purpose Rectifier Diode, DO-41 D SOD81 P10.16mm Horizontal	micro commercial	1N4005-TP	1N4005-TPMSCT-ND
D7, D8	2	1N47xxA 1300mW Zener Diode, DO-41 D SOD81 P10.16mm Horizontal	Vishay	1N4757A-TR	1N4757AVSCT-ND

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Odour stimulator - A fast, time precise open source system to deliver odours.

This open source stimulator is based on previous work by a different group. Their work is published here, here and here

developed as part of the work of the Nowotny lab and it is being setup initially for experiments with flies.
The reason we are publicly documenting things is that since the original papers describing the stimulator came out, some enabling technology has become widely available, which makes setting this up simpler and less expensive. This write up is our attempt to document this.
Some documentation of the orignal stimulator is already publicly available on github already, unfortunately some of the schematics are only in PDF format (which prevents fast conversion to PCBs) and some of the CAD files are in a proprietary format, that officially can only be read with "Autodesk Inventor". Luckily there is a plugin for FreeCad that allows the conversion to a more open format. This derivative will share orignal files that can be modified using open source sofware.

Since it would be quite expensive to reproduce the PEEK machined part they describe on the paper, we bought polypropylene filament and we printing the part. There are a couple of differences in between the two processes, and the derivatitve designs we made are optimised for printing.
Several online resources show tips and guides on how to print with this material:
https://www.lpfrg.com/guides/3d-printing-polypropylene/
https://all3dp.com/2/3d-printing-polypropylene-how-to-3d-print-with-pp/
https://www.simplify3d.com/support/materials-guide/polypropylene/
https://www.youtube.com/watch?v=yRw2mC_6A00
The electronics in this project but emphasis on using a microncontroller for timing control and connectivity with other devices. More specifically we are using an ESP32 and micropython to integrate the system with other devices/computers.