Non-contact Thermometer for Humans with Internal Data Storage
and Voice Output Features
Hikmatul Amri, Stephan and Jefri Lianda
Electrical Engineering, State Polytechnic of Bengkalis, Bengkalis, Indonesia
Keywords: Coronavirus, Non-contact Measurements, Infrared Wavelengths, MLX90614 Module.
Abstract: Corona virus (COVID-19) is an infectious disease caused by a new type of coronavirus. General symptoms
of COVID-19 are fever, feeling tired and dry cough. A fever with a high body temperature can be achieved
through non-contact measurements using infrared wavelengths. In this research, an infrared thermometer
MLX90614 module will be developed with on-screen output with 2GB internal data storage. From the tests
carried out, the results of the measurement error from distance of 1 cm are 0.62
o
C from range temperature
34 up to 40
o
C and each test takes an average of 1754.8 milliseconds.
1 INTRODUCTION
Corona virus (COVID-19) is an infectious disease
caused by a new type of coronavirus. In Indonesia,
the COVID-19 case first appeared in early March
2020 (BNPB, 2020). Until now, according to data
from the task force to accelerate the handling of
COVID-19, the global distribution of covid-19 cases
has reached 213 countries with 2,475,723 confirmed
cases and 169,151 deaths. whereas in Indonesia there
were 7,418 confirmed positive cases, 913 total
patients recovered and 635 total patients died
(Kompas.com, 2020). General symptoms of COVID-
19 are fever (body temperature above 38 degrees
Celsius), feeling tired and dry cough. Human
temperature measurement non-contact thermometer
by utilizing infrared wavelengths.
Infrared technology for temperature measurement
has been researched a lot, especially in of animal
husbandry sector (Cugmas, Šušterič, Gorenjec, &
Plavec, 2020), the industrial sector (Liu, et al., 2019),
the chemical sector (Alessio, et al., 2020), as well as
the health sector (Marques & Pitarma, 2019) (Ercoli,
Marchionni, Scalise, Tomasini, & Carnielli, 2013)
(Iven, et al., 2014) and the measurement of human
body temperature using infrared cameras
(Sumriddetchkajorn & Chaitavon, 2009). All of these
technologies are still being developed with the
addition of the latest features such as internal loger
data storage (Carre & Williamson, 2018) (Pasquali,
D’Alessandro, Gualtieri, & Leccese, 2017) (Guragai,
Hashimoto, Oguma, & Takizawa, 2018)and external
loger data storage ones equipped with internet of
things (IoT) technology (Marques & Pitarma, 2019).
In this research, a temperature reading device was
developed with the addition of a sound output so that
the readings could be directly heard by humans who
measured the temperature. Besides that, there is also
an additional feature of internal data storage with a
storage memory slot of up to 2 GB, the purpose of this
storage is used in health service places such as health
centers and hospitals. This is intended so that officers
no longer need to collect data manually but
automatically on this tool.
2 HARDWARE AND SOFTWARE
DESIGN
The MLX90614 is an Infra-Red thermometer for non-
contact temperature measurements. Both the IR
sensitive thermopile detector chip and the signal
conditioning ASSP are integrated in the same
temperature object (TO-39) can. Its low noise
amplifier, 17-bit analog to digital converter and
powerful digital signal processing unit, a high
resolution and accuracy of the thermometer is
achieved.
The thermometer comes factory calibrated with a
digital pulse width modulation and SMBus (system
management bus) output. As a standard, the 10-bit
PWM is configured to continuously transmit the
Amri, H., Stephan, . and Lianda, J.
Non-contact Thermometer for Humans with Internal Data Storage and Voice Output Features.
DOI: 10.5220/0010963300003260
In Proceedings of the 4th International Conference on Applied Science and Technology on Engineering Science (iCAST-ES 2021), pages 1255-1259
ISBN: 978-989-758-615-6; ISSN: 2975-8246
Copyright
c
 2023 by SCITEPRESS – Science and Technology Publications, Lda. Under CC license (CC BY-NC-ND 4.0)
1255

measured temperature in range of 20 up to 120˚C, with
an output resolution of 0.14˚C. The factory default
power on reset setting is SMBus. Block diagram
system of MLX90614 can be shown in Figure 1.
Figure 1: Block diagram system of MLX90614 (Melexis,
2019).
The operation of the MLX90614 is controlled by
an internal state machine, which controls the
measurements and calculations of the object and
ambient temperatures and does the post-processing of
the temperatures to output them through the PWM
output or the SMBus compatible interface.
In single PWM output mode the settings for PWM
data only are used. Based on the datasheet, the
MLX90614 has a standard accuracy of + - 0.5
o
C at
temperature measurements between 0 and 60
o
C.
In this paper designed a control system to
checking human temperature by using infrared
wavelength. Infrared waves are emitted and captured
by infrared sensors. to reduce low noise, low offset
amplifier with programmable gain is used for
amplifying the IR sensor voltage. Max offset the input
modulator and balanced input impedance is 0.5μV.
after that, the signal will be changed from analog
singnal to digital signal via analog to digital converter
(ADC). Furthermore, the digital signal will go into
DSP. signal calculations are done by the internal
DSP, which produces digital outputs, linearly
proportional to measured temperatures. From the
DSP the signal goes to the PWM block. In this block
the signal data will be storaged into EEPROM and
converted into 10-bit data and ready to be sent to the
main controller.
Every main controller (Arduino Nano V3)
requests temperature data via i2c communication, the
MLX90614 module sends digital temperature data
and the controller will display the data to the 0.96"
OLED display module and save the data to internal
storage via SD card module and output a sound
according to actual read temperature value via DF
Player Module. The device supplied from power bank
modules and Li-Ion batteries. Every request data
always started with pushed the button. This process
only takes a few seconds. So that this device can be
used easily and quickly. The block diagram system
can be shown in Figure 2.
Figure 2: The block diagram system.
While the wiring diagram system can be shown in
Figure 3.
Figure 3: The wiring diagram system.
According Figure 3, it can be explained that
arduino gets a supply from the Power bank module of
5 volr dirrect current (VDC) and supplies all
components, that is: the MLX90614 module, the
0.96" OLED display module, the SD card module,
and the DF Player module. The 0.96" OLED display
module and the MLX90614 module using inter-
integrated circuit (I2C) communication so that the
SCL/SCK pins can be joined and connected to the A5
pin on the Arduino Nano and SDA pins can also be
joined and connected to the A4 pins on the Arduino
Nano. The difference between this modules is the i2c
address. The SD card module using serial peripheral
interface (SPI) communication, so that more data pins
are used than I2C, that is: MOSI, MISO, SCK, and
CS. The DF Player module using asynchronous serial
communication so that so that there are 2 data lines
used, that is: Transmitter (Tx) and Receiver (Rx).
Arduino Nano programming made with the
Arduino IDE’s Software. In this programming, it is
done through 2 step, that is: the first step is
initialization and the second step is making the main
program. The initialization step by including the
MLX90614 library, OLED display library, SD card
library and DF Player library into the Arduino IDE’s
Software. The main programming step is requesting
temperature data from MLX90614 started with
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pushed the button switch, displaying atctual
temperaure to OLED display, saving temperatur
value to internal SD card and sounding voice via DF
player module. The initialization step can be shown
below this.
#include <Wire.h>
#include <Adafruit_MLX90614.h>
#include <SPI.h>
#include <Adafriut_GFX.h>
#include <Adafriut_SSD1306.h>
#include <SD.h>
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"
File myFile;
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);
#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2
#if (SSD1306_LCDHEIGHT !=32)
#error ("Height incorrect, please fix
Adafruit_SSD1306.h!");
#endif
Adafruit_MLX90614 mlx = Adafruit_MLX90614();
static const uint8_t PIN_MP3_TX = 2; // to
module's RX
static const uint8_t PIN_MP3_RX = 3; // to
module's TX
SoftwareSerial softwareSerial(PIN_MP3_RX,
PIN_MP3_TX);
DFRobotDFPlayerMini player;
int counter=0;
float suhu,suhutotal,rerata_suhu;
void setup() {
Serial.begin(9600);
softwareSerial.begin(9600);
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
mlx.begin();
while (!Serial) {
;
}
Serial.print("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("initialization
failed!");
return;
}
Serial.println("initialization done.");
myFile = SD.open("Suhu.txt", FILE_WRITE);
display.clearDisplay();
}
The main program can be shown below this.
void loop() {
int tombol_on=digitalRead(A3);
if(tombol_on==HIGH){
display.clearDisplay();
ambil_data_suhu();
text_suhu();
tulis_data_suhu();
keluarkan_suara_suhu();
}
else {
tampil_tekan_tombol();
Serial.println("Tekan Tombol Start");
}
}
3 RESULTS OF EXPERIMENT
In this research, will do some testing, that is:
comparison of MLX90614 module with contactless
infrared thermometer testing, internal data storage
time testing, and DF player module timing testing.
(a)
(b)
(c)
(d)
(e)
Figure 4: Graph comparison of the MLX90614 module and
the DN-997 infrared thermometer output.
Non-contact Thermometer for Humans with Internal Data Storage and Voice Output Features
1257

A. Result of MLX90614 Module
In this tests, testing is done by comparing the data
output of the MLX90614 module with the contactless
infrared thermometer Model: DN997. The test is
carried out at a distance of 1 cm up to 5 cm. The
purpose of measuring this distance is to determine the
accuracy of the MLX90614 module at a certain
distance. After a combination of measurement
distances is carried out against the measurement
results, it is known that the ideal distance for
measuring human temperature is known. The test
results of MLX90614 can be seen in Figure 4.
For distance of the sensor from the object (a) 1
cm, (b) 2 cm, (c) 3cm, (d) 4 cm, and (e) 5 cm
Based on Figure 4, it can be concluded that the
most accurate measurement results are obtained at a
measurement distance of 1 cm with an average
measurement difference of 0.62
o
C. Whereas for a
distance of 2 cm the average difference is 1.43
o
C, at
a distance of 3 cm the average difference is 1.88
o
C,
at a distance of 4 cm the average difference is 2.19
o
C,
and at a distance of 5 cm the average difference is
2.47
o
C.
B. Result of SD Card Module
The first step in testing the SD Card module is to
format the memory and ensure that the type is system
fat32. Then the SD Card is inserted into the SD Card
module and readings are carried out from the Arduino
program. if the reading is successful, the SD Card
module is ready for use.
In this tests, time is calculated starting from the
reading of the MLX90614 module sensor up to the
command to write the sensor reading data to the SD
card module. The test was carried out 5 times. The
results of SD Card module can be shown in table 1.
Table 1: Result of SD card module.
No. Data sensor Write
data
Time Captions
1 31.25
o
C 31.25
o
C 155 ms Success
2 31.53
o
C 31.53
o
C 157 ms Success
3 31.13
o
C 31.13
o
C 153 ms Success
4 31.39
o
C 31.39
o
C 154 ms Success
5 31.19
o
C 31.19
o
C 153 ms Success
Average of writing time 154.4 ms
According to table 1, The SD card module has
successfully stored temperature data with an average
time of 154.4 ms.
C. Result of DF Player Module
The first step in testing the DF player module is to
record sounds ranging from "30.00 degrees Celsius"
to "40.00 degrees Celsius" sounds. Then the sound is
stored on a separate memory card with an internal
data storage memory. When the reading is finished,
the recorded voice is called in according to the
temperature measurement value that was read. for
example, if the read temperature is 31.25, the
resulting sound is “Thirty-one point two five”.
In this tests, time is calculated starting from the
reading of the MLX90614 module sensor up to the
command to write the sensor reading data to the SD
card module, and voice output from DF player
module. The test was carried out 5 times. The results
of DF player module can be shown in table 2.
Table 2: Result of DF player module.
No. Value Voice output Tie (ms) Captions
1 31.25
“Tiga puluh satu
koma dua lima”
1754 Success
2 31.53
“Tiga puluh satu
koma lima tiga”
1757 Success
3 31.13
“Tiga puluh satu
koma satu tiga”
1754 Success
4 31.39
“Tiga puluh satu
koma tiga
sembilan”
1755 Success
5 31.19
“Tiga puluh satu
koma satu
sembilan”
1754 Success
Average of voice output time 1754.8
According to table 2, DF player module
successfully emits the same sound as the temperature
sensor reading value with an average time of 1754.8 ms.
4 CONCLUSIONS
The results of testing MLX90614, It known that, the
farther the sensor distance from the object, the greater
the reading error. The smallest error is obtained on
measurements with a distance of 1 cm to the object
with an average error of 0.62 oC for temperature
measurement from 33 oC up to 40 oC. While in the
test module SD Card and the module DF Player did
very well, with an average time of 154.4 ms storage,
and execution time module DF Player of 1754.8 ms.
ACKNOWLEDGEMENTS
This research was carried out thanks to financial
support from the Center for Research and Community
Service (P3M) via applied research to PNBP State
Polytechnic of Bengkalis grants.
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1258

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