• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Build a sensor that detects air flow using an incandescent lamp to detect the air flow.

Extracts from this document...


Aim: The aim this project is to build a sensor that detects air flow using an incandescent lamp to detect the air flow. An LED will also be included in the circuit and as the air flow increase the brightness of this LED will also increase. A voltmeter will be connected in parallel to the Led to detect the changes in voltage as the airflow changes. Introduction: The circuit will use an incandescent lamp to detect the airflow. The glass around the bulb will have to be cracked, this will expose the filament. The glass will be cracked by wrapping it round in masking tape and cracking, therefore the glass can be removed without damaging the filament. With the filament exposed to the air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As the air flows over the filament it is cooled down and therefore lowering the resistance. ...read more.


Not shown in the circuit diagram is the voltmeter that will be connected in parallel with the LED. 1. The resistors and capacitor: There are four resistors which I will be using, shown in the table above. The resistors are used to direct current flow to particular parts of the circuit, and used to determine the voltage gain of the amplifier. Resistors are used with the capacitor (t introduce time delays) 2. The potentiometer: The potentiometer is used to control the current in the circuit, i.e. in this case it controls the strength of the sensor. 3. The Voltage Regulator: The voltage regulator's job is to reduce the 12 volt signal to the lower voltage required by the bulb. 4. The Op Amp: The Op amp is very important component in the circuit. This is because it has seven other components connected it. 5. The Incandescent lamp: The bulb (filament) in this circuit is also very important. ...read more.


With the line of best fit we can estimate the air flow of the vacuum at any distance. The equation of the line, worked out is y = -0.0623x + 5.7487. With this equation we can also estimate the other value when given one value, for example we can estimate the air flow of the vacuum when given the distance from the sensor. The y value would represent the voltage, and the x value would represent the distance. Something else I noticed was t5he circuit was very sensitive to small changes in the airflow. Evaluation: In conclusion, the sensor worked very well, and there were not too many problems. However when I was doing my testing, rather than using a vacuum and changing the distance, a device were you can control the actual wind speed would have given more accurate results. Over all I very happy with the way this project went. I did have to replace a few components as they got destroyed wile I doing my preliminary tests, but I had ordered spare. I got decent reading as the graph demonstrates. Sensor Project - Air Flow Detector Niraj Shah ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Systems and Control section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Systems and Control essays

  1. Elecrtonics - Audio Amplifier

    Each amplifier has notch filters to cut out sounds beyond the human hearing range (15hz - 25Khz). These notch filters are created by C2 and R1 (high pass) and C1 and R2 (low pass). This amplifier is set to give a gain of 10 (220k/22k=10).

  2. Bicycle Alarm Project

    This is a complex circuit and a truth table and Karnaugh map have been made up to simplify the circuit as much as possible. These are shown below. Explanation A = Full set state - when A=1 system in full set.

  1. Getting On Line Without a Computer or Internet Access at Home

    Hill PL; Chester Boro and Township (Joint Free Library of); Clark PL; Clementon Memorial; Cliffside Park PL; Clifton Free Public Library; Closter PL; Collingswood PL; Cranbury PL; Cranford Public Library; Cresskill PL; Crosswicks PL; Cumberland County Library D Delanco PL; Demarest PL; Denville Free PL; Deptford Township (James H.

  2. Design and Technology Project Design an Advertisement

    The PCB was compressed to the smallest size I could make within the time, so I would have sufficient room for the wires to be tidied away, as well as room for the LED's and the switch. Originally I planned out a specification for my project; I am going to

  1. Aim: 'Build a sensor circuit to test the proximity of an object using a ...

    2.20 0.40 2.44 0.35 2.75 0.30 3.07 0.25 3.58 0.20 4.15 I then drew a graph of my results: Graph 1 Vout/v Distance/m I then used Graph 1 to test my sensor by placing the object at random positions on the table within my range and using the graph to try and work out what it's distance was.

  2. Aim: Build a sensor circuit to test the proximity of an object using a ...

    connected to a bulb with a clamp holding the bulb in place for the simple circuit.

  1. Water level sensor

    This will give me more accurate answer. Average Water/ml Voltage cross the sensor (v) Voltage cross the resistor (v) 0 1.74 4.15 100 2.00 3.89 200 2.34 3.55 300 2.63 3.27 400 3.00 2.99 500 3.05 2.85 600 3.18 2.71 700 3.32 2.58 800 3.40 2.49 900 3.49 2.41 1000

  2. The aim of this investigation is to design, build and test a sensor.

    Note that this movement is continuous. The electron cannot occupy as shell that is already full. To this end, it does not stop as it passes through any of the other shells and if, as in this case the first shells are full, it will fall into a new electron level that was previously empty.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work