Ongoing Reseach Projects

    We are currently working on the following projects. We are always looking for talented hard-working
    students. If you are interested in joining our group please send your resume to wleonsal@purdue.edu

    Optical Frequency Identification (OFID)

    OFID is the name we have given to a new technology that uses high-efficiency solar cells to transmit and receive
    information wirelessly while harvesting radiant energy from the envrionment. Transmission of information with a solar
    cell is possible by modulating the luminescent radiation of the solar cell. We use GaAs solar cell because they
    exhibit high electro-luminescent and photo-luminescent radiation. This type of devices can be used for Internet
    of Things (IoT) applications for monitoring home, industrial and office environments.

    Wireless Soil Health Monitoring

    In this project we are developing a wireless network of sensors to monitor soil health parameters such as
    soil temperature, soil moisture, soil conductivity and CO2. This network has been designed and built from the
    ground up by Dr. Jino Ramson, post-doctoral researcher in the Arequipa NEXUS Institute.

    Solar Radiation Sensors

    In this project we are sensors to measure solar radiation. In particular, we are interested in measuring
    photosynthetic active radiation (PAR). This is the portion of the solar spectrum (from 400 nm to 700 nm)
    that drives photosynthesis. Develping affordable and accurate PAR sensors will benefit farmers and crop
    growers around the world. The design of this sensor is being led by Dr. Jegan Rajendran, post-doctoral
    researcher in the Arequipa NEXUS Institute.

    Circuit Printing

    Taylor Zigon, an M.Sc. student in the tinyLab has been working on building an open-source extrusion printer for printing
    circuits on a variety of substrates including paper, rubber and 3D printer structures. This printer can print custom circuits
    within minutes on substrates that mainstream PCB fabrication technology would not allow.

    Reconfigurable Energy-Havervesting CMOS Image Sensors

    This project seeks to use the photodiodes present in every pixel of an electronic camera as tiny solar cells that can harvest
    solar and ambient radiant energy when the camera is not being used to capture images.
    We have designed and fabricated a custom microchip containing an array of 64x64 pixels that can be configured to harvest energy
    or to capture images.

    We have also developed a tiny PCB on which we have mounted our microchip. On the other side of the PCB we have placed a
    an ultra-low power microcontroller that reads out images from the microchip and sends them to a computer over an I2C

    RFID-based Corrosion Sensor

    In this project we developed a sensor to measure long-term corrosion in concrete. The sensor uses a three-electrode
    potentiostat and a low-power microcontroller and is fully powered by an RFID reader through concrete.

    Optical Stimulator for Fruit Flies

    In this project we developed an open-source instrument to optically stimulate small insects (Drosophila flies).
    Our instrument uses several blue and red LEDs to illuminate the interior of two chambers where a vial with flies
    is deposited. Light intensity and temperature are controlled with a Raspberry Pi computer.

    Test of LED Lights on Airport Taxiways

    In this project we developed a wireless network of sensors to monitor the performance of an LED lightning system
    installed at the Purdue airport.