Study of Different Sensors used in IoT

Kumar, et al Study of Different Sensors used in IoT Study of Different Sensors used in IoT Neelam A Kumar Computer Engineering SRCOE, Lonikand  neelam.labhade@gmail,com Khushali Phalke Ayesha Shaikh Computer Engineering SRCOE, Lonikand Shweta Dhawade Computer Engineering SRCOE, Lonikand Aarti Kamble Computer Engineering SRCOE, Lonikand Computer Engineering SRCOE, Lonikand ABSTRACT Technology is advancing in various fileds. The paper focuses on addressing customer needs and emphasizes the importance of time in the real world. However, people often spend a significant amount of time in supermarkets, facing issues like long queues at the billing section and difficulty in calculating the total cost of purchased items. To tackle these problems, the paper proposes a solution known as the “Smart shopping trolley with automated billing.” The IoT kit includes components like RFID tags, an RFID reader, LCD display, and Bolt ESP8266. The process involves consumers placing items in the trolley, where the RFID reader scans the RFID tag of each item, displaying the value on a digital display panel. Once the consumer completes their shopping, the bill is sent to the counter section, saving time and allowing consumers to know the total cost of their purchased items early on. KEYWORDS : LCD display, Shopping trolley. INTRODUCTION A comprehensive review of sensors encompasses an exploration of various sensor types, ranging from traditional to cutting-edge technologies, such as temperature sensors, pressure sensors, and proximity sensors. The paper delves into the working principles of these sensors and discusses advancements in sensor technologies, including the integration of MEMS, nanotechnology, and quantum sensing. It highlights the diverse applications of sensors across industries such as healthcare, automotive, agriculture, and environmental monitoring. The review emphasizes the role of sensors in smart systems and the Internet of Things (IoT), detailing their contributions to smart cities and connected devices. Wireless sensor networks, energy harvesting, and sensor fusion techniques are explored, shedding light on their importance for remote monitoring, power optimization, and enhanced data accuracy. Challenges in sensor technologies, including calibration, reliability, and security, are discussed alongside potential future directions, providing insights into the evolving www.isteonline.in Vol. 47 Special Issue landscape of sensor research and development. and to provide a thorough understanding of the current state and future trends in sensor technologies. TYPES OF SENSOR Sensors are devices that detect and measure physical or chemical phenomena and convert them into electrical or digital signals. The main function of a sensor is to provide information about its surroundings or environment. 1. Temperature 2. Pressure 3. Proximity 4. Light 5. Motion 6. Humidity 7. Gas 8. Sound 9. Image No. 1 April 2024 136 Kumar, et al Study of Different Sensors used in IoT PRESSURE SENSORS 10. Biometric 11. Force 12. Magnetic 13. Radiation Sensors 14. Inertial Sensors TEMPERATURE SENSORS Fig 2. Pressure Sensor Fig 1. Digital Temperature Sensor Temperature sensors serve the purpose of gauging the extent of warmth or chilliness in an object. The functionality of a temperature meter hinges on the voltage traversing the diode. The alteration in temperature is directly proportionate to the resistance of the diode. As the temperature drops, the resistance decreases, and conversely, it increases as the temperature rises. The diode’s resistance is measured, and this measurement is translated into temperature units, which are then presented in numerical format on readout units. In geotechnical monitoring applications, these sensors find application in determining the internal temperatures of structures like dams, bridges, and power plants. Incorporating a temperature sensor into a control or compensation circuit necessitates an output in a practical format from the detection circuit. Analog circuits typically yield resistance as the output. To integrate the temperature measurement into a digital control and compensation setup, it must be converted into a digital format suitable for processing by a Microcontroller Unit (MCU). This is commonly achieved by interpreting the measurement as a voltage through the utilization of an analog-to-digital converter (ADC). www.isteonline.in Vol. 47 Special Issue Pressure sensors are like special tools that can sense and show us when the force on a liquid or gas changes. Imagine a closed box with air inside, and we want to know if we’re squeezing or releasing the air inside. A pressure sensor helps us see and keep track of these changes. It’s like a helpful tool that lets us know when things are getting squeezed or relaxed, whether it’s in a closed box or even in the open air around us. Strain Gauge Pressure Sensors These use a flexible diaphragm that deforms under pressure, causing a change in resistance in a connected strain gauge. • Piezoelectric Pressure Sensors: These generate an electrical charge when subjected to pressure, based on the piezoelectric effect. • Capacitive Pressure Sensors: These measure changes in capacitance between plates, with one plate being flexible and deforming under pressure. PROXIMITY SENSORS Proximity sensors are like magic eyes that can find objects without actually touching them. Unlike some other devices that need to touch things to know they’re there, proximity sensors use special tricks to feel the presence of objects without any physical contact. This means they won’t scratch or damage the objects they’re checking. Proximity switches work using a principle called inductive coupling.’ They create a magnetic field, and No. 1 April 2024 137 Kumar, et al Study of Different Sensors used in IoT when something comes into this field, it messes up the magnetic field, causing the switch to turn on. There are three main types of proximity switches: nductive, capacitive, and photoelectric. indicate lighter areas. Note: Remember that it is important to calibrate your Light Sensor by calculating a threshold value. Light sensors measure illuminance, which can be used to measure more than the brightness of a light source. Because the illuminance decreases as the sensor moves away from a steady light, the light sensor can be used to gauge relative distance from the source. Light sensors are commonly used to detect ambient light and can be used to control the switches of electronic equipment. This includes automatic lighting, safety systems, and automatic curtains. Light sensors are also used in lighting control systems. These sensors measure the amount of ambient light present and adjust the electric lights accordingly. MOTION SENSORS Fig 3. Proximity Sensor LIGHT SENSORS Fig 4. Light Sensor A light sensor circuit is a basic setup that turns on when it senses light. It consists of a photoresistor and a transistor. When light shines on the photoresistor, it transforms the light energy into an electrical signal, which then activates the circuit. A light sensor circuit activates when light is detected by the circuit. It is a simple circuit including a photoresistor followed by a transistor. When light strikes the surface of the photoresistor, light energy is converted into an electrical signal and thus, the circuit is operational. The Light Sensor is an analog sensor, and it returns values in the range of 0 to 4095. Higher values indicate that the sensor is in a darker area, and lower values www.isteonline.in Vol. 47 Special Issue Fig 5. Motion Sensor These sensors can feel the warmth from people and animals. If the sensor notices more warmth, like someone coming close, it tells the home security system. Then, the security system makes a loud noise to alert you that someone might be around when they shouldn’t be. A motion sensor, serving to detect movement or changes in the physical environment, operates using different principles. The most common type, Passive Infrared (PIR) sensors, identifies changes in infrared radiation when warm objects, like humans or animals, enter their field of view, triggering a response. Other motion No. 1 April 2024 138 Kumar, et al Study of Different Sensors used in IoT sensors include Ultrasonic sensors emitting ultrasonic waves, Microwave sensors analyzing microwave reflections, and Dual Technology sensors combining multiple technologies for enhanced accuracy. Motion sensors find applications in security systems, activating alarms upon unauthorized movement, and in lighting control, managing the illumination of spaces based on detected motion. Despite their utility, motion sensors face challenges such as the potential for false alarms, especially in outdoor settings where animals or environmental factors can inadvertently trigger the sensor. Strategic placement and sensitivity adjustments help mitigate these challenges, making motion sensors integral to security, automation, and energy conservation in various technological applications. SOUND SENSORS A sound sensor, utilized for detecting and measuring sound levels in various settings, functions by converting sound waves into electrical signals through a microphone or piezoelectric element. These devices are integral in applications like noise monitoring in industrial environments, security systems for detecting unusual sounds, and home automation systems responding to specific sound patterns. There exist analog sound sensors, providing an output proportional to sound intensity, and digital sound sensors offering a digital output signal based on predetermined thresholds. Despite their usefulness, challenges include sensitivity to ambient noise, necessitating additional signal processing, and calibration to ensure accurate measurement. Overall, sound sensors play a vital role in modern technology, contributing to safety, security, and automation in different domains. GAS SENSOR Fig 6. Sound Sensor Imagine a sound sensor as ea rs for a machine. This sensor listens to sounds around it and turns them into signals that the machine can understand. It has a tiny board with a microphone and special circuitry. sound, it measures how loud it is and sends a signal to the machine using a chip. This helps the machine know when there’s noise around. In measuring sound, the main tool is the microphone. Think of it as ears for machines. These microphones can hear different frequencies, from what we humans can hear to even sounds that are too high or too low for us. They help us understand and measure all sorts of sounds in our surroundings. www.isteonline.in Vol. 47 Special Issue Gas sensors are like electronic noses that sniff out and recognize different gases. They’re often used to find harmful or explosive gases and measure how much of them is in the air.A gas sensor, essential for identifying and measuring the concentration of gases in different environments, plays a critical role in ensuring safety and environmental monitoring. These sensors operate on various principles, each contributing to their versatility in gas detection. Chemiresistive sensors, for instance, detect gases by measuring changes in electrical resistance, while infrared sensors rely on the absorption of infrared light by gases. Catalytic sensors monitor temperature changes resulting from gas-catalyst interactions, providing another effective detection method. Photoionization detectors use ultraviolet light to ionize gas molecules, generating an electric current proportional to gas concentration. Additionally, metal oxide gas sensors track changes in the conductivity of a semiconductor when exposed to specific gases. The applications of gas sensors are extensive, ranging from industrial safety measures to environmental pollution detection and home safety systems. Despite their usefulness, gas sensors face challenges such as calibration requirements and sensitivity variations. In conclusion, gas sensors, with their diverse detection methods, significantly contribute to maintaining safety and environmental well-being in various settings. No. 1 April 2024 139 Kumar, et al Study of Different Sensors used in IoT This Specific Sensors Used For smart trolley system types project and Additionally, integration with a microcontroller or a central processing unit is crucial to gather data from these sensors and make intelligent decisions based on that information. REFERENCES Fig 7. Gas Sensor CONCLUSION RFID (Radio-Frequency Identification): RFID tags and readers can be used to track and manage items placed in the trolley. Ultrasound Sensors: Ultrasonic sensors can be used to detect obstacles and measure distances. They are helpful for implementing collision avoidance systems, ensuring that the trolley can navigate through a space without bumping into objects. Wheel Encoders: Wheel encoders can be used to measure the rotation of the wheels, allowing for precise control of the trolley’s movement and position. 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