Presentation on theme: "By Edward Doust D&T: Electronics and Control Systems Candidate number: Centre Number: 16527."— Presentation transcript:
By Edward Doust D&T: Electronics and Control Systems Candidate number: Centre Number: 16527
Theme choice I have chosen security as my theme. The reason why I have chosen security alarms as my theme is because burglary has gone up in resent years due to people not having burglary alarms, poverty and people are getting attack more because they have more valuable objects on them. Also they are being raped because they have no alarm on them to say that they are being raped. The yellow is showing what I have chosen to do for my security alarm.
Conclusion The reason that I have chosen a mat alarm Is that if you have it outside the front or back door the burglar will step on it and the alarm will go of even before he gets into the house. Also you could have it at the bottom of your stairs so if someone does get in and you have valuables upstairs then he would be deterred before e get a look at the valuables and runs away with nothing.
Users Needs the users needs is an alarm to send a warning to the burglars and may deter them from burgling the building. Here are some examples to show the rise In burglary's in the UK ‘Britain was hit by Three burglaries every two minutes last year as the number of break-ins soared.’ Says The Sun Here is some evidence of someone being robbed on holiday: ‘‘The occupants were away on holiday and returned to find a downstairs window had been tampered with.’’ says BBC news and also ‘’An Essex couple whose house has been burgled for the third time in two years.’’ these quotes show that people are being burgled because they don’t have any security alarms. You are most likely to be burgled if you are in an isolated place because no one can see you. When your on holiday because no one is at home so there isn’t a threat of you seeing them and if you can’t see you shed because its behind trees or its down the end off the garden. The reason for this is because you cant see the shed you wont now if your shed is being bracken into. This picture shows that the shed is easy to get access too. To hopefully prevent this from happening the owner should put an alarm on the fence or on the shed so if the owner couldn’t see the shed they then would Know if someone is climbing over the fence or braking into there shed. This picture show that there is no alarm to stop the bugler from bracketing in the house. To hopefully prevent this from happening the owner should fit a security alarm in or on the house.
Investigation of Users’ Needs
Evidence of someone being burgled on holiday or at when out of the house Here is some evidence of people being burgled whilst on holiday or out the house. ‘‘The occupants were away on holiday and returned to find a downstairs window had been tampered with.’’ says BBC news and also they say another one which is, ‘’An Essex couple whose house has been burgled for the third time in two years.’’
Conclusion From these evidence I have found out that everyone ca get burgled no matter how rich, poor or how famous you are, you can still get burgled. This shows that even celebrities don’t have burglar alarms because the think that they won’t get burgled.
The Design Brief I have found out that more people are getting burgled every year and every 3 minuets someone is getting there house broken into around the world. Its more likely if you haven't got an alarm in your house, you are going to got burgled. I am going to make a product that will alert the owner of the house is being Brocken into. what you need to do next. I need to design my circuit in circuit wizard to see if it works first. Then I need to find these, an siren so the owner of the house can hear it going off, a battery to make the circuit have power, a switch to turn on the circuit, a small LED to tell you its on, a push to make button so to make the alarm go of, a latch so when the burglar steps on the mat the alarm stays on and a reset button so you can reset the alarm without turning it of.
My Questionnaire 1.Have you ever been burgled? 2.Do you want a security devise? 3. How much would you pay for one? 4.What size would you like it? 5.Would you like it to have a flashing LED light ? 6.Would you like it to be sustainable? 7.Would you like it to be portable? 8.Roughly how many burglary's does your village have every year? 9.Do you want it disguisable? 10.Do you want it to have a power indicator? The red means that that is the most popular.
Evidence Questionsyesno 1.Have you ever been burgled? IIIIIIIIII 2. Do you want a security devise? IIIIIIIIII 3. Would you pay £5-£10 for one? IIIIIIIIII 4. Would you like it to be compact? IIIIIIIIII 5. Would you like it to have a siren? IIIIIIIIII 6. Would you like it to be sustainable? IIIIIIIIII 7.Would you like it to be portable ? IIIIIIIIII 8. Roughly how many burglary's does your village have every year? 5,1,3,8, Do you want it disguisable? IIIIIIIIII 10. Do you want it to have a power indicator? IIIII
Product Comparison ProductCost Typical user When / Where used? Function Technology used (Input / Output) Manufacturing process used Dummy camera £9.95 Its used at home and at work. To trick burglars to think that there is a camera. Input: nothing because its fake. Output: a light flashing. High pressure water is used to cut into shape. Burglar alarm £50 Used at home or work. To alert the owner of the house that its being Brocken into. input: a sensor Output: a siren. Injection moulding. TREND net camera £99 Used at work, supermarkets, banks and shops. To look at people and what they do In the area. input: video signal Output: live footage of the area. Injection moulding.
Trend The more expensive the product the better quality the casing and the design, however the cheaper products the less time has been spent on it and has bad quality casing. Conclusion in conclusion I have deduced that my circuit will be around the middle of the table, it will not be expensive but will have decent and well designed components and materials. I will be doing this because 70% of the people I asked said they would pay between £5-£10, this is not cheap but not ridiculously expensive either.
My Specification Feature designReason for feature The purpose of my product is to alert the owner of the house that its being broken into. The is because people get burgled every day and there is a high crime rate in burglary's. My product needs to detect when the house is being bracken into. This is because it needs o fulfil its purpose. My product needs to detect when the house is being bracken into. This is also because it needs o fulfil its purpose. The output of my product will be a siren.This is so that the owner can hear the alarm go of. The power supply will be a battery.This is because they are easy to use and change also some are rechargeable. The circuit will run on 9VThis is because the battery that I will mostly be using is 9 volts and its good voltage for my circuit. My circuit will have a on/off switch.This is because it saves power when not in use. My circuit will have a power on indicator.This is because other wise no one will know is the circuit is on or working. My circuit will be designed by using circuit wizard.This is because circuit wizard is easy to use and has all the right components. I will ensure that my circuit will be well made and work by testing it and making sire that all the components are in the right place. The reason for this is because if I didn’t check the components were in the right place it wouldn’t work and to see that it doesn't work I will test it.
Product analysis B7-HIDDEN PRESSURE ACTIVATED MAT ALALARM CHIME ALERT/STAIR MAT FOR INTRUDER ALARM Alarm System Mat Door Entry Security Pressure Activated with Chime or 120Db Intruder Alarm Alert + Flashing Light. FunctionTo tell you or someone around, that the house is being burgled. User need fulfilled “Works well under mat & has an alarm the neighbours could hear! Some thought needs to be taken about pets setting it off though!” I can't believe what a difference this has made to my business. It came on time, packed really well and so easy to put together, all it needed was a couple of batteries. Only thing I found was that to open the back of the alarm to place the batteries was a bit of a problem not that easy, but very happy with purchase. Materials used in construction PCB Components Black plastic rubber PCB Components Rubber plastic Durability of product Good durabilityVery good Sustainability (6Rs) Reusable and recyclable Life cycleCheap to make, good quality build could be recycled. Last 2-5 yrs Cheapish to make, good build quality could be recycled. Could last 3-5 yrs Energy useBatteries and does not use mains powerIt can use the mains power and batteries
System Diagram The ones in yellow mean that they are the ones I’m using in my circuit. Delay before INPUT INPUT Combine inputs? Delay after INPUT PROCESS Delay before OUTPUT OUTPUT Heat sensorANDMosfetBuzzer Light sensorORThyristorSiren Dark sensorNANDTransistorLED Moister sensorNORDarlington pairLight Cold sensorComparator Pressure mattAstable
Ideas for the circuit In this circuit it senses pressure with a pressure mat and latches on with a Thyristor. This circuit could solve the problem very well as it has a latch so the buzzer will keep going till the circuit is reset or turned off. In this circuit it sensors pressure with a pressure mat but doesn’t latch on because it doesn’t have a Thyristor. This circuit couldn’t solve the problem as it doesn’t have a latch so when the burglar steps on it he would only hear it when he stands on it.
chosen circuit I have chosen this circuit to be my circuit and to develop it. I have chosen this circuit to make and develop because it has a latch on it.
Circuit development In this circuit I have added an AND gate and a dark sensor in so I can put more than one input in it and will work only in the dark only. I this circuit I have added a reset button by the buzzer. In this circuit I have added a LED to the power so I now when the circuit is on
Testing my final and chosen circuit. This circuit will solve the problem as most burglaries happen at night and this circuit will work at night. Conclusion
Development of PCB In this PCB I have made it smaller so you can carry it around easier. In this PCB I have changed the pad sizes and hole size. I have done this because it won’t waste materials. So it is more sustainable. In this PCB I have changed the battery and switches connectors.
Final PCB circuit
Testing my PCB
Tools and Equipment Printed circuit board Bubble etch tank PCB Drill Soldering Iron Solder Wire cutters Wire stripers
Planning the manufacture process Process descriptionEquipment requiredSafety issuesTips for success Design PCB and mask-Circuit wizardNone Cut board to size-Band sawSaw blade is sharpe. Keep hands away when it’s turned on. Make sure your measurements are accurate before cutting. Expose mask and photo PCB to UV light -UV light -Photo PCB -Mask of my circuit UV light is harmful and can damage your eyes if you look into it. So cover your eyes. Expose for 10 minutes Develop exposed PCB-Development fluidCould be harmful if spilt on skin or cloths Wear gloves and goggles Etch PCB-Etchant -Bubble etch tank Etchant is corrosive if spilt on cloths or skin Make sure drill is the right size. Drill holes-drilldrills are powerful and you can drill into your hand. Make sure the board is secure in a holder so it’s easier to drill holes. Solder resistors-Soldering iron -Solder -Resistors Soldering iron is hot so keep hands away from the end. Make sure the board is secure in a holder so it’s easier to solder. Solder thyristor-Thyristor -Soldering iron -Solder Soldering iron is hot so keep hands away from the end. Make sure the board is secure in a holder so it’s easier to solder. Solder of board components-Solder -Of board components Soldering iron is hot so keep hands away from the end. Make sure the board is secure in a holder so it’s easier to solder. Shrink wrap connections between off board components and wires -Heat gun -Shrink wrap connectors Heat gun is extremely hot. Keep away from other people, cloths, skin and body parts. Hold wire at the bottom so it’s easier to see when it’s done. Test circuit-BatteryNonenone
Manufacturing process This is my PCB board before all the components are on. This is me soldering the wires to the off board components on to the Board Now I’m adding a little bit of solder to help the wire to stick to the off board components. Next I’m shrink fitting the component so it stops water from damaging the component and helps keep the wires together. This Is my board after soldering on the resistors and the And.
After I then added a switch to make the circuit turn on, a push button switch, to reset the circuit when it goes off and a LDR sensor to activate the pressure mat. I then added a siren to deter the burglar if they step on the pressure mat, a LED to tell you that it’s on and a battery connecter to attach the battery.
Making the pressure mat First I got some cardboard, foil and scissors. Next I cut 3 squares of cardboard into the correct size. Then I cut the middle out of the cardboard so then the two bits of foil will then touch each other. I then started to cut out 2 squares of foil to the size of the square cardboards. Next I glued the two squares of foil to the cardboard. I then taped the 3 squares of cardboard together with masking tape and taped the wires to each piece of foil.
Mistakes that I made I made a mistake by soldering in the wrong off board component on the wrong hole. To solve the mistake I got the solder off with some copper filament by heating up the solder and placing the copper filament on the solder so it gets rid of the solder and pulled it out the off board component. I made a mistake by soldering in the chip socket I the wrong way. I know this because on one side there is a small dip which should face the top of the board. But even though it’s the wrong way round it still works but usually the dip faces the top of the circuit board. I made a mistake by soldering two wires of a component together. To solve this I got some copper filament and heated the solder up and got the solder of and did the soldering again.
Evidence of my final circuit working Drag the mouse over the picture, then press play underneath it. Checklist First when the circuit is turned on a green light power indicator should turn on. Then when you press on the pressure mat, when the LDR detects light, the alarm will not go off. When the LDR detects darkness and you press on the pressure mat the alarm will go off and will continue to sound even when it subsequently detects light. To stop the alarm you then press the blue.
Evaluation Description of process What went wellProblems encountered or changes made Action taken to deal with problems Design PCB and create mask we did several developments from the original and tested it at every stage. There wasn’t any.None. Add resistors I made sure that the colours of the resistors were correct before I soldered then in. There wasn’t any.None. Add transistors/ thyristors When putting in the transistor and thyristors I made sure to not push it in the board to hard so I don’t break. There wasn’t any.None. Add chip socket When I put the chip socket in I made sure that I didn’t push it in to hard to the board so I did not break any of the connector pins. There wasn’t any.None. Add of board components I made sure that I put the right components on the right place and that I didn’t snap any of the wires. I soldered one of the off board components in the wrong place. I got some copper filament and heated the solder with a soldering iron and got the solder off. Add chip to socket I made sure that I didn’t touch the chip with my hands and had to use a chip grabber to put the chip in the socket because I my static electricity could ruin the chip.
Improvements of my circuit To improve my circuit in the future I could make the alarm go off in the day and night rather than just at night because even though most burglary's happen at night some still happen during the day. Also if you are away on holiday then if your house is being burgled then the alarm could got off and scare the burglar of. Also I could make the pressure mat have a setting to have a curtain weight to set the alarm of if the owner had a pet or if something fell on the pressure mat when it’s turned on. I could make the circuit have flashing lights around the house if the owner of the house is death or hasn’t got very good hearing. Then they would no if someone is breaking in there house when they are in the house.