• 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.

    39sec 33 15.4% 2 39sec 38 2.6% 3 39sec 38 2.6% 4 39sec 34 12.8% 5 39sec 37 5.1% 6 39sec 37 5.1% 7 39sec 38 2.6% 8 39sec 39 0.0% 9 39sec 39 0.0% 10 39sec 38 2.6% Overall average percentage of accuracy: 15.4+2.6+2.6+12.8+5.1+2.6+0.0+0.0+2.6= 48.8 48.8 = 4.88  

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

    PL; Garwood Free PL; Gibbsboro PL; Glen Ridge Free PL; Glen Rock PL; Gloucester City Library: Gloucester County Library. H Hackensack (Johnson PL); Hackettstown Free PL: Haddon Heights PL: Haddonfield PL; Haledon Free PL; Hamilton Township Free PL; Hanover Twp (Whippanoag Assoc.

  1. Solar Power

    A new high-voltage, direct-current power transmission backbone would have to be built (William Yeager, DC Power). Studies indicate that long-distance DC lines lose far less energy than AC lines do over equivalent spans (Androcles, Google Groups). The backbone would radiate in all directions from the Southwest toward the nation's borders.

  2. The paper discusses the issues associated with the risks assessed between the organizations bidding ...

    mergers and acquisitions is widely used by organizations to better strengthen their organizations with the combination of two somewhat lucrative organizations or by a larger more powerful organization acquiring an organization that is less likely to become a strong independent organization.

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

    Wood jointing techniques My project is going to consist of a boxed receiver unit and an ergonomically designed laser sender unit. This is why this portion of my research will consist mainly of carcase jointing techniques. Butt Joints Butt joints are the simplest and easiest to make, but don't support much weight and do not look very attractive.

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

    However as time went on toy cars were invented with moving wheels. The British Association of Toy Retailers (BATR) deduces a toy of the year and has been doing so since 1965. These are their criteria. Toy of the Year Awards The BATR prestigious Toy of the Year awards are

  1. Experiments with Digital Systems.

    The AND function will output the value of A and B if they are the same value or it will output a 0 if A is different from B. The NAND function will see the inputs as not A and not B, and will output the exact opposite of the AND function.

  2. Report into Electricity Generation and Sustainable Energy

    Not only does this make the circuit more complex, but it also protects its own integrity because no matter where a problem or breakage in the circuit occurs, only the path to which the breakage is in will be affected, while the other loads will remain un-affected.

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