A printed circuit board is available for adapting 0-5V control signals to drive 12V or 24V solenoid valves in olfactometers. The details on the most recent version (4.1) of Joe’s olfactometer can be found at https://github.com/joebell/valveDriver. The components for assembling the driver boards are kept in a box labeled “olfactometer driver parts” in the back of the lab.