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Puspita, Nabilla Putri
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Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Sistem Monitoring Kualitas Udara Jarak Jauh Berbasis Sensor MQ-2, MQ-6 dan Sensor DHT11 Iqbal, Muhammad; Puspita, Nabilla Putri; Rasyid, Rahmad; Yusfi, Meqorry
Jurnal Fisika Unand Vol 14 No 2 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.2.137-144.2025

Abstract

Air quality is influenced by activities that produce gas from natural and human sources, so monitoring gas levels is important to prevent health threats. The goal is to create a natural gas monitoring tool that is efficient (easy to use) and can be accessed from a smartphone. The tool designed uses MQ-2 and MQ-6 sensors for detecting gas levels and DHT11 sensors for temperature and humidity. Data is sent in real-time on the smartphone via the Blynk application with the nRF24L01+ module. The results showed that the system worked well in monitoring butane, methane, temperature, and humidity. The highest error value on the MQ-2 sensor is 24.375%. Methane gas measurements using the MQ-6 sensor show the highest error value of 11.06%. The nRF24L01+ module successfully sends data to the receiver and activates the Light Emitting Diode (LED) and buzzer when the value exceeds the set limit. This module can send data up to a distance of 1000 meters without Line-of-Sight (LOS) obstructions and has a reduced distance of up to 600 meters in the presence of Non-Line-of-Sight (NLOS) obstructions. The Blynk application successfully displays data measuring gas levels, temperature and humidity.
Desain dan Implementasi Sistem Pendingin Berbasis Peltier TEC 12706 dengan Pemantauan Jarak Jauh Melalui Aplikasi Blynk pada Smartphone Puspita, Nabilla Putri; Yusfi, Meqorry
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.8-14.2025

Abstract

Cooling technology plays an important role in daily life, particularly in refrigerators used for storing fruits, vegetables, and beverages. However, conventional cooling systems still use freon, which can damage the ozone layer. This study utilizes the Peltier Effect on the Peltier TEC 12706 module as an environmentally friendly cooling component. The DHT22 sensor is used to measure temperature and humidity, while the NodeMCU ESP8266 processes sensor data displayed through the Blynk application. Three fans are installed outside the cooling chamber to prevent the Peltier module from overheating, and one fan is placed inside the chamber for air distribution. A heatsink is used to assist in heat dissipation. Testing compared the DHT22 sensor with AZ HT-02 and FY-11, producing regression values of R² = 0.9902 for temeprature and R² = 0.9798 for humidity, indicating high accuracy. Using two Peltier TEC 12706 modules and a 12 V 30 A AC-DC adapter, the temperature in the cooling chamber with dimensions (26x17x10) cm was reduced to 19.6°C, with humidity rising to 90.1% within 2 hours. These results show that the developed cooling system can function effectively.
Co-Authors Meqorry Yusfi Muhammad Iqbal Rasyid, Rahmad