Open-Source Microcontrollers for Science - Open-Source Lab: How to Build Your Own Hardware and Reduce Research Costs - page 78

The available command on this screen is “ ∗ ”, which will step you to the next information
screen and show you the relative humidity set point. Finally, in the relative humidity set point
screen, press “ ∗ ” to go back to the main screen ( Figure 4.21 ).
Once you are back in the main screen ( Figure 4.21 ) , if # is pressed, the controller menu
will be shown. The available commands are “1”—Set Controller Status; “2”—Set Temperature;
“3”—Set Relative Humidity; or “ ∗ ” to go back to main screen. In Controller Status screen, press
“1” to activate controller and “2” to deactivate controller or “ ∗ ” to go back to the main screen.
On the temperature screen, press “1” to set temperature or “ ∗ ” to exit to the main screen. When
“1” is pressed, the user will be prompted to enter a desired temperature as shown in Figure
4.23 .
FIGURE 4.23 Control screen to input the temperature set point in degrees celsius into the
Bear Chamber.
After you have entered your desired temperature, a check screen will be shown ( Figure
4.24 ) .
FIGURE 4.24 Control screen showing target temperature confirmation.
If the temperature entered is correct, press “#” to accept or “ ∗ ” to edit. Once the temperature
is accepted, the system will show the main screen ( Figure 4.21 ). If the controller is already ON,
the system will automatically start; otherwise, set the controller to ON in order to have the
system operating. The menu controls for the relative humidity information, input, and con-
irmation screens and set point process are identical to the temperature. After seting up the
temperature once, this should be intuitive.
4.5.8 Troubleshooting
Similar to experiments, rarely does scientific hardware builds work perfectly the very irst
time. Anticipate that your lab will need to spend some time on troubleshooting—particularlyif
if you are trying new tools or microcontrollers, your group has not built up a specialty in yet.
Hopefully, however, the troubleshooting will be fast and easy. If your project is having gener-
al problems with the Arduino (e.g. you get errors when launching the Arduino software, you
cannot upload a sketch, or you are having problems geting your sketch to run), see the Ar-