This is the repository for an open source mechanical testing machine with environmental control. A double glazed enclosure is built using OpenBeam extrusion and clear plastic panels as outlined here. Humidity control is achieved with a reservoir/chamber, ultrasonic mister, fan driven air flow and a servo controlled flap/valve. This is discussed further here. Temperature control is achieved using the same fan driven air flow system, resistive heating and multiple DS18B20 digital temperature sensors. This approach and alternatives to it are discussed here.
Documentation for the instrument, including assembly instructions and discussion are here.
This instrument was created by @rob-eager in 2014-15 as an MEng final year project and is currently being documented. It also has a Github Pages page under development.