We learn how to construct a data collection system of sensors by using SD card with an Arduino.
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Through of circuit presented in the Figure 1, is possible see all equipments used to construct the project.
Figure 1 - Circuit of Data Acquisition System
Each LED represent a specific state of the system.
Hereafter will be present each function according to each LED:
• Red LED: Used to signal a problem with memory SD Card and its connections;
• Green LED: Used to signal the finish of the process of data collection;
• Yellow LED: Used to signal the process of data collection.
Before in the void setup, the system will initialize the SD Card and case it is not connected, the system will activate the Red LED to signal fault of
The user needs connect the SD Card and reset the system.
The Red LED is presented in the Figure 2.
Red LED to signal when the card not is connected.
After the verification of the SD Card, the system will initialize and always that the button is pressed the system will collect 10 values of the analog A0 pin and
In this moment, the yellow LED will signal for inform at the user that the system is collecting the datas, as is presented in the Figure 3.
Green LED to signal the begin of the collection data process.
After the data collect, the yellow LED will be deactivated and the green LED will activate to signal the finish of the process, as is presented in the Figure 4.
Green LED to signal the end of the collection data process.
In this moment, the system wait to be off or if the user presses the button again, more ten values will be stored.