This paper describes a novel electronic nose (enose) aimed at applications that require knowing not only the gas composition and concentration, but also its temporal and spatial evolution. This is done by capturing additional information related to the chemical substance such as the timestamp and geo-location of the measurements, as well as other physical magnitudes of the environment like temperature and humidity for correcting and interpreting the data. The device has been conceived following a modular architecture as a set of independent smart modules, which are interconnected and controlled through an I 2 C interface by a central processing unit. Each smart module can identify itself, store settings for autoconfiguration and perform signal pre-processing of the measured variables. Smart module types include: chemical sensors, communication interfaces, batteries, data storage, GPS, temperature and humidity.

This paper presents an experimental study of the suitability of a mobile e-nose (carried on a bike) for the monitoring of unpleasant and potentially harmful odors in urban areas, likely coming from residential waste containers. The objective is to obtain a spatial and temporal representation of such odors by means of a gas distribution map, from which valuable information such as the location, or the time-intervals of maximum strength of the nuisance odors can be inferred. As a case of study, the results of a monitoring campaign carried out in a town in southern Spain are presented. The campaign comprises nine measurement runs distributed along three consecutive days, with a total path of more than 90Km. Upon the results, it is concluded the feasibility and potential of the approach, but also the need for a precise sensor characterization and for gas classification.

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This paper describes the design, implementation and evaluation of a novel circuitry that extends the popular Arduino UNO microcontroller board to facilitate multiple educational activities in engineering courses. In particular, the aim of this board, the UMA-AEB, is to minimize the overhead that is usually imposed on the students before they can conduct the actual exercises, yet retain the valuable experiences that could otherwise not be acquired with simulated experiments or inflexible electronic training-benches. The UMA-AEB is also meant to bring analog and digital electronics closer to other common disciplines in engineering, such as high-level programming languages (e.g. MATLAB) or Real-Time Operating Systems (e.g. FreeRTOS), by easing its connection to a personal computer for control and debugging. The features on the UMA-AEB range from simple input-output devices like a potentiometer, several buttons, eight individually addressable LEDs and a seven-segment display, to more advanced components like an SPI memory module for data-logging, a configurable resistiveinductive-capacitive (RLC) first and second order resonator, and a bidirectional analog-digital interface supporting -10 to +10 V, a common range for most college-level laboratory classes. The resulting design can be manufactured at a significantly lower cost than other similar devices (around 50€ not considering labor costs such as component-soldering and basic diagnoses), and both simulation and real tests have demonstrated that the obtained functionality agrees accurately enough with our design requirements after suitable calibration methods. We intend to use the board in very diverse subjects in the next years; up to date, we have already included it in a control systems course (graduate) and in embedded realtime courses (undergraduate and master), as well as student dissertation projects and a web-accessible electronics-laboratory. Hence, we present the possibilities of our shield for these and other courses and also some educational results obtained in the past academic years.