Could you please put me in touch with the hardware designer of the OSTC4 as I have an idea I'd like to discuss. Also could you please let me know the part number / model number of the pressure sensor used in the OSTC4.
Please email me at info@heinrichsweikamp.com - I designed most of the OSTC 4 hardware. You can find many details about the hardware in the code: [bitbucket.org]