Contactless Temperature Sensor

DOI : 10.17577/IJERTCONV10IS11097

Download Full-Text PDF Cite this Publication

Text Only Version

Contactless Temperature Sensor

Preetha P S Department of EEE JIT, Davangere

Vinod Kumar M Department of EEE JIT, Davangere

Tajuddin R Nadaf Department of EEE JIT, Davangere

Sayed Tahir M Kittur Department of EEE JIT, Davangere

Abstract The most essential fact in today's environment is social separation. The fact is that the initial symptom of a COVID-19 patient is a high body temperature. The rationale for this is that while gauging body temperature is critical, it is also necessary to maintain social distance.

While standard thermometers cannot guarantee social distance, our contactless thermometer which uses an Arduino uno as the main control device and an MLX90614 as the infrared (IR) thermometer sensor, can accomplish temperature on display. As a result, as compared to a standard thermometer, it has advantages such as easy reading and precision, as well as the ability to display temperature output digitally. Furthermore, owing of its easy of use, it would be used everywhere.

KeywordsCOVID-19; temperature; Arduino uno; MLX90614; output digitally


    On earth all thing or object has its own temperature. Recent advancements in electronics and microelectronics devices have enabled the creation of new low-cost monitoring systems that can be utilised by people for health prevention. As we see, the technology is increasing day by day in the medical field. As we see nowadays the many deaths due to Coronavirus disease (COVID-19) where its main symptoms can be identified by the temperature of the human body [1-3]. The advanced technology places a role by introducing a contact less temperature sensor. This gadget is being used to measure the body temperatures of employees, students, and customers at building entrances. This system is made out of open-source electronic components that are inexpensive and simple to put together. Because of the close proximity of the afflicted people, a classic thermometer that is now being produced and utilised for detecting body temperature from items poses a severe risk to all. In this instance, contactless thermometers can be utilised in both regular and dangerous environments [4]. For example, in factories and research facilities, to assess the temperature of hot bodies. Furthermore, in the medical area, where measuring the body temperature of a badly infected/burned patient is risky and unsecure. In this place a contactless thermometer is much helpful. It is easy, safe and accurate to measure temperature [5].


    The contactless temperature detector works on the principle of Stefan Boltzmann Theory. According to Stefan Boltzmann Everybody radiates Infra-red (IR) Radiation proportional to

    its temperature. As a result, the optical analysis of the measuring object's IR radiation is used [6]. A lens focuses the radiation onto a detector, which converts it to an electrical signal. This electrical signal is subsequently transformed into an output, such as an electronic display, print, or sound alerts.

    1) Sensing the hot body: Whenever a body is placed in front of a IR TEMPERATURE sensor, the radiations enjoyed by the body (living things, hot objects, hot surfaces) which is nothing but Infrared radiations is first sense by a IR sensor which focused the emitted radiation of object and funnelling that radiation into a detectors. Here we using MLX 90614 IR temperature sensor. [11]

    1. The detector that converts the funnelled radiation into here which turned into measurable quantity such as electricity parameters [7].

    2. Converting of IR radiation to electrical parameters: The electrical parameters read by a microcontroller which read the quantity of electrical parameters which is proportional to the emitted radiation of the body. Here we are using "Arduino Nano" microcontroller for performing this function [8].

    3. Output: The measured electrical parameters then displayed to a visible led display or any other output devices is terms of Fahrenheit or degree Celsius units. Here we are adopting 128*32 12C OLED display.

    Figure 1 : Flow Chart


    Figure 2: Block diagram


    Figure 4 : Connection of motor to Arduino nano


    The model works on the principle of Stefan Boltzmann Theory. It states that Everybody radiates Infra-red (IR) Radiation proportional to its temperature [9][10]. When the object is placed, the Infra-red signals acts on the surface of optical placed in sensor. Then IR radiation is collected and funnel them to optical sensor. Sensor senses the IR waves. The collectors IR radiations converted to electrical parameters such as current/voltage. These parameters are proportional to emitted IR. The output is displayed on led display in Fahrenheit/0C units.


    Temperature is one of the most important parameters and the most monitored one in the industrial process sector. Temperature sensors and transmitters have attained importance due to the high level of safety they provide, accuracy of measurement, and capability to measure from cryogenic to very high temperatures. Temperature sensing is more of a dynamic measurement; therefore, the sensing instrument has to be extremely precise in detecting and interpreting the right signal. Manufacturers of temperature sensors have been improving their product ranges from time to time. Among the existing temperature technologies, noncontact technologies, such as infrared, are being adopted by key companies, such as Honeywell and ABB.

    Figure 3 : circuit diagram

    As shown in fig:3 the batter is connected toTP4056 battery charging module in loop with on/off switch and Arduino nano. The buzzer is connected between charging model and Arduino nano. The MLX90614 IR Temperature Sensor, APDS-9960 Proximity Sensor and 128×32 I2C OLED Display connected in parallel to Arduino nano. the switch is connected to the temperature sensor.

    Recent Research and Development :

    The field is being propelled ahead through innovation. Flexible temperature sensors have recently been explored and optimised, including flexible thermocouples, flexible thermistors, and flexible thermochromic kinds; active-matrix flexible temperature sensors and self-powered flexible temperature sensors are examples [13] [14].

    Patients temperatures have been monitored using printable, high-sensitivity flexible sensors [15]. There is a trend toward designing wearable sensors that can monitor temperature, avoiding the problems associated with cumbersome equipment and measurement mistakes caused by a variety of factors such as the wearer's movement.

    In the field of non-contact infrared thermometers, recent work on developing a low-cost, more accurate Arduino-based

    infrared thermometer for body temperature sensing is another interesting study. Arduino is an electrical platform for transforming input to output that is free and open-source. The goal of this research is to find a solution to the problems. In the sensor sector, there is a growing trend toward non-contact temperature sensors. The market is expected to expand to

    $1350.2 million by 2027, demonstrating that non-contact and contact temperature sensors have a bright future. [12]


The technology shows the temperature's evolution without requiring any interaction. On a daily basis, we are battling concealed illnesses that transmit from person to person. As a result, we must maintain a social distance when assessing body temperature without touching. Thismethod will aid in the design of any contactless thermometer as well as temperature measuring without touch. In addition, the contactless thermometer has further applications, notably in the medical area. Using cutting-edge integrated circuits (ICs) with cutting- edge semiconductors technologies, the system is effectively implemented and evaluated.

In the current environment, this applied revolutionary study on an expanded version of IR thermometry application is an integrated solution input to combat the pandemic in a modified and uncomplicated method with novelty and high cost.


[1]. Piezo-electrics & Acousto-optic (2001) 23: 202-205.

[2]. Chaglla EJ, Celik N, Balachandran W (2018) Measurement of Core Body Temperature Using Graphene-Inked Infrared Thermopile Sensor. Sensors 18: 3315. doi: 10.3390/s18103315

[3]. Parameshachari, B.D. and Panduranga, H.T., liberata Ullo, S., 2020, September. Analysis and computation of encryption technique to

enhance security of medical images. In IOP Conference Series: Materials Science and Engineering (Vol. 925, No. 1, p. 012028)

[4]. Crawford D, Hicks B, Thompson M (2006) Which thermometer? Factors influencing best choice for intermittent clinical temperature assessment. J Med Eng Technol 30: 199-211.

[5]. Di Gennaro F, Pizzol D, Marotta C, et al. (2020) Coronavirus diseases (COVID-19) current status and future perspectives: A narrative review.

Int J Env Res Pub He 17: 2690. [6]. de Gennaro G, Dambruoso PR, Loiotile AD, Di Gilio A, Giungato P, Tutino M, et al. Indoor air quality in schools. Environmental Chemistry

Letters 2014;12:46782.

[7]. Madureira J, Paciência I, Rufo J, Ramos E, Barros H, Teixeira JP, et al. Indoor air quality in schools and its relationship with childrens respiratory symptoms. Atmospheric Environment 2015;118:14556.

[8]. Yang L, Yan H, Lam JC. Thermal comfort and building energy consumption implications A review. Applied Energy 2014;115:164 73.

[9]. Havenith G, Holmér I, Parsons K. Personal factors in thermal comfort assessment: clothing properties and metabolic heat production. Energy and Buildings 2002;34:58191.

[10]. Pereira LD, Cardoso E, da Silva MG. Indoor air quality audit and evaluation on thermal comfort in a school in Portugal. Indoor and Built Environment 2015;24:25668.

[11]. G. Jin, et al., Design of Non-Contact Infra-Red Thermometer Based on the Sensor of MLX90614, The Open Automation and Control Systems Journal, vol. 7, no. 1, pp. 8-20, 2015.

[12]. E. D. Bolat, Implementation of Matlab-SIMULINK Based Real Time Temperature Control for Set Point Changes, International Journal of Circuits, Systems and Signal Processing, vol. 1, no. 1, pp. 54-61, 2007.

[13]. J. Baruah, et al., Microcontroller Based Temperature Monitoring and Controlling System, International Journal of Advanced Information Science and Technology (IJAIST), vol. 3, no. 6, pp. 38-42, 2014.

[14]. S. Saha and A. Majumdar, Data Centre Temperature Monitoring with ESP8266 Based Wireless Sensor Network and Cloud Based Dashboard with Real Time Alert System, in Devices for Integrated Circuit (DevIC), pp. 307-310, 2017.

[15]. H. M. Thwe and H. M. Tun, Patient Health Monitoring Using Wireless Body Area Network, International Journal of Scientific and Technology Research, vol. 4, no. 06, pp. 364-368, 2015.