Wasserpumpe

An Embedded Systems application powered by an Arduino Due Board, which uses an ARM Cortex M3 Architecture.

Usage

This project implements a water dispenser system commanded by certain keys on your keyboard.

Technologies

The whole project is controlled by an Arduino Due Board, having an ARM Cortex M3 Architecture.

The processor (Cortex M3) a frequency of 84MHz.

Most of the capabilities of the board are used:

• Interrupt Handling
• Timer Component -> Wave and Capture modes were used to generate a Clock signal for the pump, and measure certain frequencies respectively
• Serial Comunication -> Minicom was used to display real-time messages regarding the water filling process and also to send an Input from Keyboard to control the pump.

Setup:

Scale

The scale system implies two strings: one stretched and one compressed. By using them in combination with Timer Component - Capture Mode, and a simple formula:
,
(where c1 = 17942, c2 = 40 are the system constants and the f's are the two strings' frequencies), we were able to find out the mass in real time.

Keyboard vs Numeric Pad

An elegant solution in our system is the use of Keyboard for twe two possible commands:

• key C - for calibrating (measuring the mass of the empty cup);
• key P - for pumping (starting the system); by default, the system pumps 25 grams (hardcoded value).

The user interface waits for our key, so it takes advantage of Serial Comunication. If we had chosen to use the Numeric Pad (indicated in the picture) and implicitly make use of Interrupt Handling, the physical action of pushing a button would send a wave in the system and influence the strings, hence influencing the mass.

Modules

• ARM_Cortex_M3_Doku: contains an extensive documentation on the processor specs
• Implementation: it has the source code in src/main.c and the necessary Makefile for Make OpenOCD to build the executable for the board
• Include: necessary includes and constants regarding the processor
• Linker
• Media: pictures and videos of the setup
• Source: also important source code for the processor

Documentation

The present Dokumentation_DE.pdf is a developer-guide on how to use the project.

Note: you need to work in Visual Studio Code

Special Thanks

The project was done under the coordination of Prof. Thomas Horsch and Laboratory Engineer Manfred Pester, both of Hochschule Darmstadt of Applied Sciences, Germany.