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MATLAB-temp-sensor

A student project for ENGR114 at Portland Community College. Uses MATLAB to read a temperature sensor connected to an Arudino over serial.

Problem Statement

For our final lab, our group was tasked with setting up a temperature sensor for the hydroponic fish tank-garden shown to the right. This sensor will be used to monitor the water supply for the garden. Using an Arduino and MATLAB, the water temperature will be recorded over a set amount of time with the temperature displayed at regular intervals. A plot of the temperature as a function of time will also be generated for a visual representation of the temperature vs. time. The temperature measurement setup will be used to monitor the temperature of the water in the hydroponic fish tank-garden.

Hardware Setup

Bill of Materials

Fritzing Diagram

Connected Hardware

Arduino is connected to the computer via a mini-USB (connector shown at right of photo). The temperature sensor is connected to the Arduino through a breadboard that incorporates a pull-up resistor to keep input voltage up. Connections as follows: red wire of sensor is input, green is signal, black is ground, these are connected to three different rows on the breadboard. The red, white and black jumpers connect the breadboard to the Arduino with the following ports, 3.3V, Digital-7 and GND (respectively). The resistor is placed between the signal wire and input for the Arduino.

Arduino Code

The temp_sensor.ino sketch was uploaded on the Arduino using the Arduino IDE.

MATLAB Code

The temp_sensor.m script was run in MATLAB.

Results

The plot above is a sample output of our code using the temperature sensor and Arduino board. Time is on the x-axis while temperature in degrees Fahrenheit is on the y-axis.

Future Work

This is a great starting point for future work with the hydroponic fish-garden. The MATLAB program could be used to get baseline values for the temperature and use those values for further changes to the conditions. If the temperature is too low, a program could be written to turn on a heater until the water reaches a certain temperature. If the temperature is too high, the same program could be used to turn off the heater. Long term monitoring could be used to find trends that correlated to any number of factors, plant cycle, fish health, plant health, etc. Inconjunction with software from other groups. this garden could be almost fully automated and controlled remotely via a wi-fi connection.

License

GNU General Public License v3.0