Another Raspberry Pi-based project, I created this sensor suite
at the end of my junior year. Several of my Independent Science Reasearch
classmates had just created several hydroponics tanks to try growing plants in, but
they had to go out and measure the temperature, electrical conductivity,
and other vital statistics in the tanks every single day. I thought
it would be a good idea to take on a side project and automate that for them.
I hooked up a pH meter, a temperature guage, and a homemade electrical
conductivity meter to a Raspberry Pi, submerged the sensors, and
had it report to a MySQL database. Every ten minutes, it polled the sensors,
recorded the values, and if any were too high or too low, it emailed an
alert to our teacher (as the only person with 24/7 access to the building).
This functioned perfectly, saving my classmates time and allowing me
to check up on the plants every once in a while without actually
having to record values myself. The project caused an unfortunate
spam issue when a plant died over the summer vacation, but functioned
soundly until then. When the hydroponics program at HPA is somewhat
more developed, it is my hope to expand this project to include
an automatic system for introducing new water, nutrient solution,
or pH buffers to the plants when they need attention.