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All Journal Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science
Roslina Mohamad
Universiti Teknologi MARA
Electrical & Electronics Engineering

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Power Harvesting Using Piezoelectric Shoe For External Power Storage Mohammad Saffri Mazalan; Roslina Mohamad; Murizah Kassim; Shahrani Shahbudin
Indonesian Journal of Electrical Engineering and Computer Science Vol 9, No 3: March 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v9.i3.pp655-659

Abstract

The demands for portable energy source have increased because most portable electronic device needs the extra energy throughout the day due to the user’s increase in power consumption. Hence, a piezoelectric power harvesting shoe circuit with storage mechanism capabilities is designed by using piezoelectric disc material, 1N4007 bridge rectifiers, USB cables, and an external power storage. Piezoelectric disc material of 27mm and 35 mm in size that produces AC voltage when applied pressure is embedded in shoe’ insole and the output AC voltage is converted using a bridge rectifier for each material. The output is connected to a USB cable and can be connected to the external power storage during power harvesting. Different sizes of piezoelectric disc produce different amount of voltage and are also affected by the pressure applied to it. An amount of 5V is the requirements needed to charge an external device. The 27mm disc produces a voltage of 3V to 5V depending on the pressure applied while the 35mm disc produces 4V to 6.2V. Piezoelectric disc material is an alternative way to harvest energy when embedded to a shoe with an added storage capability as it solves the problem of needing the extra energy for electronic devices.
IoT based smart irrigation, control, and monitoring system for chilli plants using NodeMCU-ESP8266 Amirul Amin Abd Halim; Roslina Mohamad; Farah Yasmin Abdul Rahman; Harlisya Harun; Nuzli Mohamad Anas
Bulletin of Electrical Engineering and Informatics Vol 12, No 5: October 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v12i5.5266

Abstract

Traditionally, chilli plant irrigation relies solely on rainwater, which leads to uncontrolled and excessive water consumption and, in turn, unhealthy growth. Furthermore, existing cultivation systems lack systematic control and monitoring to sustain efficient crop growth. Much effort has been put into developing plant irrigation control and monitoring systems in recent decades, resulting in significant technological advancements in the agricultural sector. This paper describes the development of an internet of things-based irrigation control and monitoring system testbed for a chilli plantation. A DHT11 sensor, comprising of moisture, temperature and humidity sensors, were integrated with a node microcontroller NodeMCU ESP8266 unit interacting via wireless fidelity. A controller system that could remotely control the irrigation system was placed in the plantation area. Users interacted with the system through a user interface platform developed using Blynk and Thinger.io. Hence, real-time sensor data were sent to the user interface platform and represented in an easy-to-interpret manner. The results show that the irrigation system testbed can also control the amount of water used, ensuring efficient plant growth.
Co-Authors Adiba Abd Ghafar Afdallyna Fathiyah Harun Afdallyna Harun Ahmad Syahir Arif Mohd Zaid Ahmad Zaki Abu Bakar Amirul Amin Abd Halim Amirun Murtaza Abd Jalil Azlina Idris Cik Ku Haroswati Che Ku Yahaya Farah Yasmin Abdul Rahman Firdaus Hashim Hamizan Suhaimi Harlisya Harun Ismail Musirin Mohamad Yusuf Mat Nasir Mohammad Saffri Mazalan Murizah Kassim Murizah Kassim c Norsuzila Ya’acob Nuzli Mohamad Anas Nuzli Mohamad Anas Ruhani Ab Rahman Saiful Izwan Suliman Shahrani Shahbudin Yuslinda Wati Mohamad Yusof Zaki Firdaus Mohmad