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

Developing a Fridge Add-On

Extracts from this document...

Introduction

Research To help me with my design I need to find out information about - 555 timer- what does it do? What is it made from? What do the pins do? How will it go in my circuit? LDR What does it do? How does it work? How is it powered? "Anyone who uses a refrigerator will be able to use this product. This product is something useful which anybody can benefit from it is a product that can be of assistance to you in everyday life." It will be used in the kitchen inside a refrigerator so the circuitry will have to be concealed within a casing. This is because the refrigerator operates below room temperature and therefore the circuitry must be able to operate under these conditions. The casing is a vital part of the product because in a refrigerator many things can easily damage the circuitry. To operate this product there must be a power supply and the only thing, which could be used and concealed completely, is a battery. The battery though must be easily accessible for maintenance purposes. ...read more.

Middle

The Circuit The circuit above is a circuit which will be based on my final circuit; I am using a light dependant resistor because when a fridge is opened a light comes on and so when the light dependant resistor picks up the trace of light the 555 timer will start and after fifteen seconds of the light dependant resistor picking up light the buzzer will sound, so indicating that the fridge door has been left open. The Light Dependant Resistor If the control situation requires different levels of light this is likely to be the device used. The light dependant resistor is an analogue device and so its output is variable. However, it can be connected directly into the digital input connections of the interface. If different light levels need to be detected it must be connected to the analogue inputs of the interface. A battery can power the light dependant resistor and with my circuit that is the only possible way! The astable circuit will probably suit my circuit the best because when the fridge door is opened a beep is sounded until the door is shut. ...read more.

Conclusion

The main problem now is the fact that there is a continuous bleep, and if the person wanted to clean the fridge this would become very annoying so to prevent this a manual override switch should be placed in to allow this beeping to cease. To notify the person that they have turned off the circuit the best thing to do would be to have a led to light when the circuit is off but when the circuit is turned back on the led is automatically turned off. Switches Switches can direct the current around the circuit by re-routing or breaking the connections that make up the circuit. There are a large number of switches but the one which would probably be best with my circuit is the single pole double throw, this type of switch can offer a choice of two directions for the current to take depending on the position of the pole. The other alternative is the single pole throw, this type of switch can only make or break a circuit. The battery is not very expensive and allows maximum durability, which is why I do think it is best for my circuit. All the things I researched are all needed to produce my electronic product. ...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. 555 Timer Practical.

    in water to remove any ferryc chloride solution left on the PCB Boards. Components After the PCB Board has been etched and the circuit is clearly shown on the PCB Board, I will drill the hole for where the components need to be soldered.

  2. 'A small business wishes to sell a range of electronic games to help alleviate ...

    Dovetail Joints Dovetail Joints are the strongest carcase joints because they can only be pulled apart in one direction and they have a large glueing area. If they are well made they can also be an attractive feature. For my project I have decided to use dovetail joints becase they are very strong and aesthetically pleasing.

  1. Experiments with Digital Systems.

    This can be said by (A*B)=A+B=A*B and A+B=A*B. The pictorial representations of these functions are in figure 1 below. Table 1 AND OR NAND NOR XOR A B A�B A B A+B A B (A�B) A B (A+B) A B A+B 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 1

  2. Investigate and construct a sensor.

    I would also take the decibel meter and measure the sound in the room, so I can have two results for each room, which would allow me to compare the sensors. Apparatus used: I had used the following equipment: > Decibel meter > Stereo > Crocodile clips > Oscilloscope >

  1. An electronics firm wishes to introduce a range burglar alarms. This coursework contains the ...

    I built them all using SYSTEM ALPHA to ensure that: They work I know how they work from the following information... I have decided to use the upside down switch unit with a proximity detector to sense if the rear door is opened.

  2. Design and build an electrical toy for children aged 5 years and over.

    Then as a button is pressed the motor is started and it launches the car out of the docking port inside the box. Use This will be used simply to entertain young children and add more depth to things to do with their toy cars.

  1. Building and testing a sensor to determine number of degrees to which a window ...

    The top and bottom half of the variable resistor provides these two resistances in series and the voltage is split between the two according to the relationship: V1 R1 = V2 R2 N.B V1 is the voltage received by the resistance R1, and V2 is the voltage received by the

  2. Report into Electricity Generation and Sustainable Energy

    or to solve problems (resistors that increase electrical resistance to step the current?s voltage down to prevent damage to lower voltage loads or fuses that protect the circuit). 4. In Ontario, the five most lucrative methods of electrical generation (listed in order from most lucrative to the least lucrative)

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