• 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; Midland Park PL; Milford PL; Millburn Free PL; Milltown PL; Millville PL; Monmouth Beach Library; Monmouth County Library; Monroe Township PL (Gloucester) ; Monroe Township PL (Middlesex); Montclair PL; Montvale Free PL; Montville PL; Moorestown Library; Morris County Library; Morris Plains Library; Morristown and Morris Township, Joint Free PL

  1. Solar Power

    The lines would end at converter stations where the power would be switched to AC and sent along existing regional transmission lines that supply customers. The AC system is also simply out of capacity, leading to noted shortages in Florida and other regions; DC lines are cheaper to build and require less land area than equivalent AC lines.

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

    (Wikipedia, 2007) After the integration of these companies, layoffs were eminent. Coca Cola similar to Lester Electronics will possibly consider some layoffs across the board after they are totally acquired by another organization. Downsizing and layoffs not only affects employees but it creates change in the organizations culture.

  1. '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.

  2. 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.

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

    Movement sensors are effective, but from my research I have found that you can slide yourself across the floor without the movement sensor censoring you. Pressure pads wont let this happen! The shadow sensor would not work unless there was a light shining on the stairs.

  2. Report into Electricity Generation and Sustainable Energy

    Ancient Egyptian texts dating from 2750 BC referred to these fish as the "Thunderer of the Nile", and described them as the "protectors" of all other fish. Ancient cultures around the Mediterranean knew that certain objects, such as rods of amber, could be rubbed with cat's fur to attract light objects like feathers.

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