Sensor SHT11 Research Articles

Embedded Fuzzy Logic Control System for Refrigerated Display Cabinets

Having done in this study, embedded fuzzy logic control system (EFLCS) was designed and implemented for closed refrigerated display cabinets (CRDC) to meet the required storage conditions for the pastry productions stored in CRDCs. The system keeps the temperature and relative humidity (RH) of CRDC at approximately $$+\,4\,^{\circ }\hbox {C}$$ and 80% RH, respectively. It has two fuzzy logic controllers. One of them controls the speed levels of the fans, and the other controls the steam level of ultrasonic atomizer. Temperature and RH values are read by sensor SHT11 and transferred to PIC18F4620 microcontroller that is programmed with fuzzy Logic approach. On the other hand, the compressor was controlled with on–off control in the range of 3– $$5\,^{\circ }\hbox {C}$$ . On the condition of starting from $$+\,7\,^{\circ }\hbox {C}$$ temperature, the time to approach to the set values ( $$4\,^{\circ }\hbox {C}$$ and 80% RH) for traditional system and EFLCS is 191.8 and 109.6 s, respectively. Additionally, the ranges of temperature and RH obtained by EFLCS are between 4.44 and $$3.69\,^{\circ }\hbox {C}$$ and between 81.33% RH and 78.57% RH, respectively. The temperature and RH values obtained by traditional system are between 5.56 and $$3.2\,^{\circ }\hbox {C}$$ and between 61.81% RH and 57.45% RH, respectively. Traditional system never reached to desired humidity value (80% RH). It has been seen that developed EFLCS becomes stable in shorter time than traditional system and kept the desired values as almost constants.

RANCANG BANGUN SISTEM KONTROL LEMARI PENGERING PAKAIAN BERBASIS MIKROKONTROLER ATMEGA8535

Design and manufacture of this thesis aims to apply microcontroller-based technology for drying clothes automatically without relying on erratic weather conditions. The closet dryer uses a drying method forced convection, by utilizing the flow of hot fluid to reduce moisture in damp clothing. The closet dryer uses a microcontroller ATMEGA8535 as a controller of heater, fan, and UV lamps based temperature and humidity readings by sensors SHT11. The closet clothes dryer is working until the end of the moisture conditions were legible on the sensor SHT11 is <19% RH. The results of sensor readings and status of clothing displayed on the LCD 16x2. After the clothes was dried then closet dryer will informing status of clothes through a voice module ISD1820. From the results of tests and experiments, closet dryer can dry clothes with a maximum capacity of 3 kg within a period of 1 hour to 3 hours, with the value of the first moisture drying legible and on the sensor SHT11 is 70-80% RH and 17-19% RH in the end. Keywords: Type of clothing,Microcontroller ATMEGA8535,heater, fan, UV lamp, sensor SHT11, LCD16x2, ISD1820.

Monitoring system for agronomic variables based in WSN technology on cassava crops

Agriculture, and natural resources associated to its development like water, soils and forests, have a relevant role in the future of countries and environmental conservation. The optimization of these resources is made with the implementation of technological strategies and tools that make it possible. In this sense, we developed a monitoring prototype for agronomic variables in cassava crops (Manihot Esculenta Crantz) in the Atlántico department (Colombia) based in WSN using Z1 motes as hardware platform and the temperature and soil moisture sensor SHT11. The operating system used was Contiki, and the routing protocol was RPL. The Network Performance Metrics evaluated were packet loss, RSSI (Received Signal Strength Indicator), LQI (Link Quality Indicator) and network convergence time. Then, a deployment model using Schläfli notation to determine the location and number of nodes, also we calculated the coverage range of the nodes to keep network uniformity. With these calculations, we obtained the linkage budgets between specks, and results were validated with RadioMobile software. Then, test fields were made in a cassava crop located in the city of Manati, Atlántico. Finally, with the help of server client architecture XAMPP, all data was stored and visualized through SIMCA (Agricultural Crop Information and Monitoring System), a web application developed by authors.

A GSM-Based Remote Temperature and Humidity Monitoring System for Granary

A remote temperature and humidity monitoring system is designed based on the GSM technology and MSP430. With the digital sensor DSB1820 and SHT11, the temperature and humidity of the granary are detected, and these parameters can be adjusted with the controlling system to adapt various working conditions. Through the GSM system, the detected data could be sent to various monitoring devices, such as cellphones and laptops. These data can be used for data display, inquiry, controlling and storage at the remote terminals. The experimental results show that the system is convenient and concise, which meets the remote monitoring demand for the modern granary.

Humidity and Temperature Wireless Measurement System Based on NRF905 and SHT11 in Coal Mine

In order to measure the humidity and temperature of coal mine accurately, design uses low power microprocessor MSP430F2274 as control chip in this system, data acquisition by digital temperature and humidity sensor SHT11, taking nRF905 as the core of the RF module for wireless transmission, measurement results by LCD display and transfer to PC through CAN bus at the same time. To solve the traditional way of measuring precision is low, cable transmission system needs to be at the measurement site layout of the large number of wires and cables, and the circuit for transmitting signals can be affected by electromagnetic interference problems, ensure the reliability of the measurement results. The design has given the hardware circuit diagram and data flow chart.