The document discusses sensors used in aircraft autopilot systems. An automatic flight control system uses various sensors to monitor speed, height, position, doors, obstacles, fuel and maneuvers. A computer receives data from these sensors, compares it to pre-designed values, and provides control signals to engines, flaps, and rudders to enable smooth autonomous flight. Sensors provide input to computers, which are the system's brains, and mechanics provide the outputs to control aircraft systems.
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Controlling output Reading input from pins.
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They always sound so high tech that we hardly notice that our day-to-day lives always involve the use of sensors. From IR sensors in TV remotes to passive infrared sensors on automatic doors or LDRs for outdoor and street lightings, sensors are everywhere.
Sensors detect changes, acknowledge those changes, and produce outputs from those changes. They detect and measure qualities such as light, temperature, sound, and other types of output from the environment.
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Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Cosmetic shop management system project report.pdf
Sensors in IOT
1. Real Time Application of Sensors
Autopilot System in aircrafts
Autopilot System in aircrafts
2. An Automatic Flight Control System consists of several sensors
for various tasks like speed control, height, position, doors,
obstacle, fuel, maneuvering and many more. A Computer takes
data from all these sensors and processes them by comparing
them with pre-designed values.
The computer then provides control signal to different parts
like engines, flaps, rudders etc. that help in a smooth flight. The
combination of Sensors, Computers and Mechanics makes it
possible to run the plane in Autopilot Mode.
All the parameters i.e. the Sensors (which give inputs to the
Computers), the Computers (the brains of the system) and the
mechanics (the outputs of the system like engines and motors)
are equally important in building a successful automated
system.
3. What is a Sensor?
• Sensor as an input device which provides an output (signal) with
respect to a specific physical quantity (input).
• The term “input device” in the definition of a Sensor means that it is
part of a bigger system which provides input to a main control system
(like a Processor or a Microcontroller).
• Another unique definition of a Sensor is as follows: It is a device that
converts signals from one energy domain to electrical domain
4. Example of a sensor is an LDR or a Light Dependent Resistor
It is a device, whose resistance varies according to intensity of light it is subjected to.
When the light falling on an LDR is more, its resistance becomes very less and when
the light is less, well, the resistance of the LDR becomes very high.
We can connect this LDR in a voltage divider (along with other resistor) and check the
voltage drop across the LDR. This voltage can be calibrated to the amount of light
falling on the LDR. Hence, a Light Sensor.
5. Classification of Sensors
• In the first classification of the sensors, they are divided in to Active
and Passive. Active Sensors are those which require an external
excitation signal or a power signal.
• Passive Sensors, on the other hand, do not require any external
power signal and directly generates output response.
• The final classification of the sensors are Analog and Digital Sensors.
Analog Sensors produce an analog output i.e. a continuous output
signal with respect to the quantity being measured.
• Digital Sensors, in contrast to Analog Sensors, work with discrete or
digital data. The data in digital sensors, which is used for conversion
and transmission, is digital in nature.
6. Different Types of Sensors
All these sensors are used for measuring one of the physical properties like
Temperature, Resistance, Capacitance, Conduction, Heat Transfer etc.
• Temperature Sensor
• Proximity Sensor
• Accelerometer
• IR Sensor (Infrared Sensor)
• Pressure Sensor
• Light Sensor
• Ultrasonic Sensor
• Smoke, Gas and Alcohol Sensor
• Touch Sensor
• Color Sensor
• Humidity Sensor
• Tilt Sensor
• Flow and Level Sensor
7. Temperature Sensor
• One of the most common and most popular sensor is the
Temperature Sensor. A Temperature Sensor, as the name suggests,
senses the temperature i.e. it measures the changes in the
temperature. Temperature Sensor, the changes in the Temperature
correspond to change in its physical property like resistance or
voltage.
• Thermistor
• Thermocouple
• A thermistor can be used to detect the variation in temperature. It
has a negative temperature coefficient that means when the
temperature increases the resistance decreases. So, the thermistor’s
resistance can be varied with the rise in temperature which causes
more current flow through it.
8. • Another component that can detect the variation in temperature is a
thermocouple. In its construction, two different metals are joined together to
form a junction
• LM35 is a Celsius scale temperature sensor device with its output directly
proportional to the temperature. LM35 can measure temperatures in the range
of -550C to +1500C
9. Proximity Sensors
• A Proximity Sensor is a non-contact type sensor that detects the
presence of an object. Proximity Sensors can be implemented using
different techniques like Optical (like Infrared or Laser), Ultrasonic, Hall
Effect, Capacitive, etc.
• Some of the applications of Proximity
Sensors are Mobile Phones, Cars (Parking
Sensors), industries (object alignment),
Ground Proximity in Aircrafts, etc.
10. Infrared Sensor (IR Sensor)
• IR Sensors or Infrared Sensor are light based sensor that are used in various
applications like Proximity and Object Detection. IR Sensors are used as
proximity sensors in almost all mobile phones.
• There are two types of Infrared or IR Sensors: Transmissive Type and
Reflective Type.
• In Transmissive Type IR Sensor, the IR Transmitter (usually an IR LED) and the
IR Detector (usually a Photo Diode) are positioned facing each other so that
when an object passes between them, the sensor detects the object.
• The other type of IR Sensor is a Reflective Type IR Sensor. In this, the
transmitter and the detector are positioned adjacent to each other facing the
object. When an object comes in front of the sensor, the sensor detects the
object.
• Different applications where IR Sensor is implemented are Mobile Phones,
Robots, Industrial assembly, automobiles etc.
11.
12. Ultrasonic Sensor
• An Ultrasonic Sensor is a non-contact type device that can be used to measure distance
as well as velocity of an object. An Ultrasonic Sensor works based on the properties of
the sound waves with frequency greater than that of the human audible range.
• There are two kind of an ultrasonic sensor is, “active ultrasonic sensor” and “passive
ultrasonic sensors”. An active ultrasonic sensors generates the high frequency sound
wave to receive back the ultrasonic sensor for evaluating the echo. But, passive
ultrasonic sensors are just used for detecting ultrasonic noise which is present under
specific conditions.
•
13. • Ultrasonic means nothing but the range of the frequencies. Its range is greater
than audible range (>20 kHz)
• This ultrasonic sensor is used to calculate the distance between the ultrasonic
transmitter and the target and also used to measure the velocity of the target.
• Ultrasonic sensor HC-SR04 can be used to measure distance in the range of 2cm-
400cm with an accuracy of 3mm.
• The 4 pins of Ultrasonic sensor are Vcc, Gnd, Trig and Echo. Trig is connected to
Pin 11 of Arduino and Echo is connected to Pin 10. With respect to Arduino, Pins
10 and 11 are input and output respectively.
14. Chemical/Smoke and Gas Sensor
• smoke and gas detector is a gadget that sense gas, smoke and
typically it’s an indicator of fire. Now a days all security devices using
this sensor to passing signal to fire alarm to control panel. Household
smoke detector is also known as smoke alarm, most of the device
manufacturer using audible or visual alarm system in security devices
that detect automatically.
15. humidity sensor
• A humidity sensor (or hygrometer) senses, measures and reports
both moisture and air temperature. The ratio of moisture in the air to
the highest amount of moisture at a particular air temperature is
called relative humidity(RH). Relative humidity becomes an
important factor when looking for comfort.
16. LDR(LIGHT DEPENDENT RESISTOR)
• A light dependent resistor (LDR) or a photo resistor or photocell is a light controlled
variable resistor . Its resistance changes with Light intensity that falls on it.
• • The resistance of a photo resistor decreases with increasing Incident light intensity . In
other words , it exhibits photoconductivity.
• • The resistance range and sensitivity of a photoresistor can substantially differ among
dissimilar devices.
• They are made up of semiconductor materials having high resistance.
• Photocells or LDRS are non linear devices. There sensitivity varies with the wavelength of
light incident on them.
• Some photocells might not at all response to a certain range of wavelength.
17. Motion detection sensors
• A motion detector is an electronic device which is used to detect the physical
movement (motion) in a given area and it transforms motion into an electric signal;
motion of any object or motion of human beings.
• These are primarily used for intrusion detection systems, automatics door control,
boom barrier, smart camera (i.e motion based capture/video recording),toll plaza,
automatic parking systems, automated sinks/toilet flusher, hand dryers, energy
management systems(i.e. Automated Lighting, AC, Fan, Appliances Control) etc.
• Following are key motion sensor types widely used:
• Passive Infrared (PIR): It Detects body heat (infrared energy) and the most widely used
motion sensor in home security systems.
• Ultrasonic: Sends out pulses of ultrasonic waves and measures the reflection off a
moving object by tracking the speed of sound waves.
• Microwave: Sends out radio wave pulses and measures the reflection off a moving
object. They cover a larger area than infrared & ultrasonic sensors, but they are
vulnerable to electrical interference and more expensive.
18. What is a Sound Sensor?
• The sound sensor is one type of module used to notice the sound.
Generally, this module is used to detect the intensity of sound.
• This sensor employs a microphone to provide input to buffer, peak
detector and an amplifier. This sensor notices a sound, & processes
an o/p voltage signal to a microcontroller. After that, it executes
required processing.
• Pin1 (VCC): 3.3V DC to 5V DC
• Pin2 (GND): This is aground pin
• Pin3 (DO): This is an output pin