Open-Source Microcontrollers for Science - Open-Source Lab: How to Build Your Own Hardware and Reduce Research Costs - page 74

FIGURE 4.16 Detail of mounting of the power resistor on the metal plate.
Then run the wires for the thermistors into the chamber and place the thermistors in difer-
ent, but relevant areas such as near (but not on) a power resistor, top back, top front and bot-
tom again roughly following Figure 4.15 . These can be held in place with duct tape (as shown,
with the advantage of offering quick alterations) or can be bolted, fastened, or glued in place.
Next, place the humidity sensor somewhere in the back of the chamber far from power resist-
ors. Finally, place the dehumidifiers underneath the base sheet in their mini-chamber as seen
in Figure 4.15 . The chamber is now ready to control the temperature and extract humidity.
The last step involves finishing the ability to add humidity. Drill a second hole near the bot-
tom of the chamber in your “work zone” for the humidifier entry port. The hole must have
the diameter large enough to fit the hose. Insert the hose and seal with the silicone adhesive;
also seal the other end of the hose on the humidifier with the silicone as shown in Figure 4.17 .
Your Bear Chamber is now ready for software and operation. Congratulations you just made
a >$6000 environmental chamber for less than $400! Make sure everything is plugged in and
you are ready to go.