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

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Introduction

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.

Middle

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.

Conclusion

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.

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