Now showing items 1-20 of 21

    • A new MPPT method for low-power solar energy harvesting 

      López Lapeña, Oscar; Penella López, María Teresa; Gasulla Forner, Manuel (2010-09)
      Article
      Open Access
      This paper describes a new maximum-power-pointtracking (MPPT) method focused on low-power (< 1 W) photovoltaic (PV) panels. The static and dynamic performance is theoretically analyzed, and design criteria are provided. ...
    • Alimentación de sistemas 

      López Lapeña, Oscar (Universitat Politècnica de Catalunya, 2007)
      Lecture notes
      Open Access
    • Calibration-less direct capacitor-to-microcontroller interface 

      López Lapeña, Oscar; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar (Institution of Electrical Engineers, 2016-02-18)
      Article
      Open Access
      A new technique to measure a capacitor or a capacitive sensor by means of a direct sensor-to-microcontroller interface circuit that does not need a calibration capacitor is proposed. Basically, the measurement process ...
    • CIRCUITS ELECTRONICS I (Examen 1r quadrimestre) 

      López Lapeña, Oscar (Universitat Politècnica de Catalunya, 2004-01-30)
      Exam
      Restricted access to the UPC academic community
    • Cost-effective autonomous sensor for the long-term monitoring of water electrical conductivity of crop fields 

      Serrano Finetti, Roberto Ernesto; Aliau Bonet, Carles; López Lapeña, Oscar; Pallàs-Areny, Ramon (2019-10-01)
      Article
      Open Access
      Salinity is a key parameter determining water quality. In agriculture, irrigation water with high salinity levels impacts plant growth and yield negatively hence there is a need to monitor it and irrigate with fresh water ...
    • Diseño de un circuito de control 

      López Lapeña, Oscar (2021-06-30)
      Research report
      Restricted access - confidentiality agreement
    • ELECTRÒNICA DE POTENCIA (Examen 1r quadrimestre) 

      López Lapeña, Oscar (Universitat Politècnica de Catalunya, 2004-01-31)
      Exam
      Restricted access to the UPC academic community
    • Examen final 

      López Lapeña, Oscar; Polo Cantero, José (Universitat Politècnica de Catalunya, 2018-06-11)
      Exam
      Restricted access to the UPC academic community
    • Examen final 

      López Lapeña, Oscar (Universitat Politècnica de Catalunya, 2018-10-31)
      Exam
      Restricted access to the UPC academic community
    • Examen final 

      Polo Cantero, José; López Lapeña, Oscar (Universitat Politècnica de Catalunya, 2019-01-08)
      Exam
      Restricted access to the UPC academic community
    • Examen final. Test 

      López Lapeña, Oscar (Universitat Politècnica de Catalunya, 2018-10-31)
      Exam
      Restricted access to the UPC academic community
    • Examen MQ 

      López Lapeña, Oscar; Polo Cantero, José (Universitat Politècnica de Catalunya, 2018-11-07)
      Exam
      Restricted access to the UPC academic community
    • Examen MQ 

      López Lapeña, Oscar; Polo Cantero, José (Universitat Politècnica de Catalunya, 2018-04-11)
      Exam
      Restricted access to the UPC academic community
    • Exercicis de sistemes electrònics 

      López Lapeña, Oscar (Universitat Politècnica de Catalunya, 2011)
      Problem statement, exercise
      Open Access
    • Low-power direct resistive sensor-to-microcontroller interfaces 

      López Lapeña, Oscar; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar (2016-01-01)
      Article
      Open Access
      This paper analyzes the energy consumption of direct interface circuits where the data conversion of a resistive sensor is performed by a direct connection to a set of digital ports of a microcontroller (µC). The causes ...
    • Pràctiques de sistemes electrònics 

      López Lapeña, Oscar (Universitat Politècnica de Catalunya, 2006)
      Practice
      Open Access
    • Report on RICE-GUARD Market Requirements and Preliminary System Specifications 

      KATSANTONIS, Dimitris; DRAMALIS, Christos; Pallàs-Areny, Ramon; Casas Piedrafita, Óscar; López Lapeña, Oscar; PUIGDOLLERS, Pau; PEREIRAS, Jaime (2013-12-20)
      Research report
      Open Access
      This report outlines the work carried out as part of the EC-funded project called RICE-GUARD. The project concerns the development of a novel in-field system which is going to be capable of continuously monitoring weather ...
    • Software y hardware del C8XC251 : problemas 

      Ramos Lara, Rafael Ramón; López Lapeña, Oscar; Matas Alcalá, José (Edicions UPC, 2001)
      Book
      Restricted access to the UPC academic community
      El objetivo fundamental de esta obra es facilitar el aprendizaje a los estudiantes que realicen un curso de sistemas basados en microcontroladores, en particular los de la familia MCS-251 de Intel Corporation. Con esta ...
    • Solar energy radiation measurement with a low–power solar energy harvester 

      López Lapeña, Oscar; Pallàs-Areny, Ramon (2018-08-01)
      Article
      Open Access
      Solar energy radiation measurements are essential in precision agriculture and forest monitoring and can be readily performed by attaching commercial pyranometers to autonomous sensor nodes. However this solution significantly ...
    • Technical specifications and system architecture of a compact weather station for rice blast field study 

      Pallàs-Areny, Ramon; Casas Piedrafita, Óscar; López Lapeña, Oscar; Hornero Ocaña, Gemma; Serrano Finetti, Roberto Ernesto; Quílez Figuerola, Marcos; Polo Cantero, José; Cuadras Tomàs, Àngel; PEREIRAS, Jaime; PUIGDOLLERS, Pau (2014-03-17)
      Research report
      Restricted access - confidentiality agreement
      This report describes the work carried out as part of an EC-funded project called RICE-GUARD, which is developing a novel rice blast prediction tool based on an in-field wireless sensor network. Existing systems for ...