Design y development of a graphical user interface in LabVIEW for acquisition and visualization of climatological data (temperature and relative humidity)

Abstract

This paper describes the design and development of a Graphical User Interface through the virtual instrumentation software NI LabVIEW using the VISA function, to graphically visualize and storage the data of the climatological variables of temperature and relative humidity. The graphical interface offers the option to export the date, time and data of the two variables to text documents with extension “.txt”, which acquires the information of the electronic board wireless monitoring and control, which uses a main device PIC16F877A microcontroller. AMT1001 Precision Analog Sensor was used to sense temperature and relative humidity. The PIC16F877A was programmed using a C programming language in the CCS Compiler compiler, to the data acquisition, and send it via RS232 communication to the computer, using the PL2303 module USB to TTL converter. To check the GUI operation, the electronic wireless monitoring and control card was connected to the computer equipment by wire, however, the monitoring of the climate variables can be done wirelessly by XBEE technology. Future work aims to monitor the climate of a horticultural greenhouse with XBBE technology, so that the data is sent wirelessly to a computer that has the GUI, and is also connected to Ethernet or WIFI, which will have the LabVIEW graphical interface explained in this article, and the data will be displayed / analyzed through the internet.

Implementation of a unidirectional wireless communication for monitoring Physical variables

“…Nowadays, the world's leading companies that develop and sell data acquisition and telemetry equipment for precision agriculture use devices from DIGI International (van Bavel, n.d.), which allow the farmer to review and receive alerts based on the data obtained from the sensors, in order to take appropriate action remotely (Locke, 2019). In greenhouse horticultural crops, wireless technology has been implemented in the monitoring of climate variables, because it provides flexibility in the installation of sensors, and cost reduction in infrastructure elements and maintenance complexity (PEREZ-GARCIA et al, 2022). This paper describes the implementation of a one-way wireless point-to-point communication between a transmitter unit and a receiver unit for temperature and RH monitoring inside a 10 m2 gothic type greenhouse with a curved roof located at the Polytechnic University of Juventino Rosas (UPJR).…”

“…This work was based on the methodology of PEREZ-GARCIA et al (2020), in which a SAD was implemented to monitor air temperature and RH using the AMT1001 sensor. An electronic wireless monitoring and control board with XBee technology was used as hardware, and a Graphical User Interface (GUI) designed in NI LabVIEW virtual instrumentation software was used to numerically and graphically visualise the data.…”

“…The data of the climate variables were sent from the electronic card to a personal computer (PC) in a wired way, using the asynchronous serial communication protocol RS232 and in a unidirectional way. Figure 2 shows the SAD system that implemented PEREZ-GARCIA et al (2020). The electronic card for wireless monitoring and control used in the SAD has RX, TX and GND terminals to send and receive wired data, using a USB to TTL converter module between the card and a PC.…”

“…The characters from Byte 1 to Byte 5 is the floating point data of a sensor. According to PEREZ-GARCIA et al (2020), Byte 6 (LF) is the newline character (10 in ASCII code) that is sent at the end of the string. Table 2 shows the value of the character I that was assigned to each sensor.…”

“…Figure 10 Functions used in the CCS Compiler, to send the ASCII characters from the DS18B20 sensor of the PIC16F877A to the XBee S2C configured as the final device Source: Own Elaboration, adapted from PEREZ-GARCIA et al (2020).…”