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    Item type:Publication,
    Waste Level Detectable Trash Can with ESP32 and Ultrasonic Sensors
    (2025-01-01)
    Soingkittiphong, Anyamanee
    ;
    Nuchairum, Nattakorn
    ;
    Somviphat, Krittaphat
    ;
    Oo, Saung Hnin Pwint
    ;
    Yoshikawa, Yuki
    This paper introduces an IoT-based waste monitoring system that integrates ultrasonic sensors with an ESP32 microcontroller to detect and display waste levels in trash bins. The system is designed to show whether a bin is full or empty, providing real-time waste level updates through an LCD panel on the bin and pop-up notifications via a web application. Our experimental setup uses five ultrasonic sensors, each emitting ultrasonic pulses at 40 kHz, to determine the distance between the trash can lid and the closest rubbish. The sensor also detects the reflected pulse when an object blocks the signal. After getting data from all sensors, the ESP32, programmed in C, processes these data and determines whether the bin is "FULL" or "EMPTY." The system integrates an IEEE1888 gateway for standardized data exchange and a Pocket-WiFi module for simplified network connectivity. This system is invented under the Zero-Piece concept, aiming to eliminate litter on streets and roads. Given the challenges of overflowing trash in Thailand's urban areas, we propose deploying these smart bins along city roads to improve waste management and maintain cleaner public spaces.
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    Item type:Publication,
    Fully Digital Pulse Oximeter Cosine Wave Driven Generate two PPG AMs and AM Synchronous Detector with Single Microcontroller
    (2022-01-01)
    Kainan, Pattana
    ;
    Rungkrae, Manussawee
    ;
    Wiriyatanachit, Supatsara
    ;
    Wardkein, Paramote
    ;
    Lertterada, Krittapas
    In this article, an embedded microcontroller ESP32 implement to be a pulse oximeter is proposed. The almost overall system operates on a microcontroller except for the analog front-end trans-impedance amplifier. The system works by generating two different frequency cosines with cosine function and converting them to be analog cosine signals to drive IR and Red-light sources. The two PPG AM signals are summed in FDM form at the output of the light detector, and it is amplified and converted to be digital signal by the microcontroller after that the digital signal as mentioned above is selected by two digital BPFs with different center frequencies and two PPG AMs are obtained. Two PPG AMs have been demodulated with AM synchronous detector therefore the PPG IR and PPG RED are obtained. They are employed to estimate oxygen saturated and display on OLED along with mobile devices android OS by Bluetooth communication channel. The experiment results show that the proposed system can well operate and have accuracy and precision are 98.1261% and 0.9031, respectively.
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    Item type:Publication,
    Tele-Operation of Robotic Arm
    (2019-11-01)
    Bunkum, Manao
    ;
    Vachirasakulchai, Phakjira
    ;
    Nampeng, Jindapa
    ;
    Tommajaree, Ramita
    ;
    Visitsattapongse, Sarinporn
    This research is for facilitate the healthcare worker to approach patient that located in distant areas via internet. Also, patient need not to get to the city to see a doctor. Hence, this research will reduce time and cost of traveling. This research is to create tele-control robot arm, use in the operating room, which is controlled by joystick from anywhere. It is separated into 2 parts that is hardware part to design and print 3D robot arm and joystick and software part, which is code to control robot arm also send controlling data via internet. Furthermore, this project will send real-time video from robot arm to controller side. The data is sent between robot arm and joystick by nodeMCU or in this project use two ESP32, one will receive data from joystick and send the data to another for control robot arm. In the section of sending real-time video, this project use Raspberry pi as a device for sending.