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Electronics gcse . Jack peal Unit:A511 introduction to making and designing Centre number: 16527. Gate alarm. House fire . Blue text denotes area of special interest. Unusual acting alarm. Shed fire. Shed alarm. Fire . Attack alarm. Property protection. Panic alarm .
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Electronics gcse Jack peal Unit:A511 introduction to making and designing Centre number: 16527
Gate alarm House fire Blue text denotes area of special interest Unusual acting alarm Shed fire Shed alarm Fire Attack alarm Property protection Panic alarm Light motion sensor Security Personal protection Rape alarm Bath depth alarm Feeling secure Flood alarm One to one theft alarm Old person temperature alarm Baby bath depth alarm Night light
Reason for theme choice • I have chosen security, because in my area there is a lot of burglars robbers and, my latter questionnaire research indicates that most robberies happen or the worry is on the shed because of the increase of people choosing to own their own tools and also having outdoor hobbies this is why I have chosen security because obviously there is a clear need for the middle range priced high functionality and reliable security device particularly.
designing What: alerted of damage/ theft of property When: the shed/property is un attended User needs Who: property owner Where: on home premises Why: security and protection of interest
Creativity • Stopping damage/theft of personal items • Bikes ranging from £200 to £7000 • Garden tools range from 20 to 1000s of pounds • Motorcycles ranging from £1000 to £20,000 if classical • Classic cars ranging from £10000 to £1000000 • Also with all of this wth a burglar alarm it adds a feeling of security to the user
Creativity part 2 • “Crime Report: Burglars Break into Area Homes and a Shed” this is the headline from a newspaper only 2 months ago • Police are searching for suspects in a string of shed burglaries they believe are connected, according to Lt. Stephen Doarnberger, assistant commander of Baltimore County Police Franklin Precinct No. 3.In five separate incidents between Saturday, Dec. 3, and Saturday, Dec. 10, sheds in Cedarmere Circle and Strongwood Road in Owings Mills were burglarized. In three of the incident, snowblowers were stolen. Locks were damaged in the other two incidents.“This time of year, it would be pretty easy to sell [snowblowers] without having to go to a pawn shop or any other kind of dealer,” Doarnbergersaid.In September, there were six incidents of power tools being stolen from garages and sheds in Reisterstown, but in five of those cases, the garages and sheds were unlocked.In the recent cases, the sheds were locked. The locks held in a few cases, but the lock clasps were pried off. Doarnberger cautioned that when wood ages, locks are easier to pry off as well.“There are locks now you can get in which the lock bar is very conceived, round instead of rectangular, and it makes the lock bar at the top much more difficult to cut or access,” he said. “So we recommend those.”
Evidence • This image clearly shows were my circuit would be in action, it • Would detect this window being broken into and sound a alarm • Instantly . • Also not only would my circuit be in action here it would also deter • The burglars away it also adds the feeling of security to the user so • The user can feel safe in their own homes which was one of factors • I was aiming for, it will make the consumers more likely to buy it • My alarm would be perfect for this situation because not only have i got a red LED to deter burglars from this spot, my alarm is also a reed switch and pressure mat so on pulling th window open like that the reed switch will activate my very loud siren scaring of the burglar or allowing the locals or user to ring the police.
Were my circuit would be active The arrows show were my alarm security circuit would be affective. The top arrow shows were a decoy adt alarm system box will be placed. The bottom arrow shows the magnetic/circuit breaker lock that would active on the door. Should a window be present than a lock/ circuit breaker could be applied. Imagine there is a window here
Evidence The houses with arrows pointing to them have both had burglary from there sheds and there has been 3 more burglars a long this road also I have had reports of oil been stolen from people back gardens this is something I had to factor in when choosing what circuit inputs and outputs to use to provide a security service to people in my local community. This proves that there is a real need for a loud output to be heard by local neighbors and citizens in the village to call the police.
Questionnaire • 1 Do you have a shed that stores valuable items? • 2 Are you interested in protecting your property? • 3 How many windows and doors are there on your shed? • 4 How’s your shed currently secured? • 5 Do you have insurance on your shed? • 6 Is the value of the contents of your higher than £1000? • 7 Are the contents of your shed used in everyday work ? • 8 Can you clearly see your shed ? • 9 Is your property protected by a wall or fence and visible from the road? • 10 Is your property left for long periods of time untended (e.g. over 2hrs at a time) • Question 1 and 2 identifies whether there is a need for my product • Question 3 is to identify the number of possible entry points to the shed and therefore whether there is a use for my product • Question 4 is to identify what security measures are currently in place • Question 5 is to identify whether there is a reason to protect the contents of the shed • Question 6 is to clarify that the price of my security system can be justified • Question 7 is to find out impact on user if contents stolen? • Question 8 is to find out whether there is justification to include a security camera • Question 9 this is to find out the increased risk of visibility from public area • Question 10 is to find out if the vulnerability of the property
Related products This circuit has a light dependent resistor which was one of my options when i was deciding what would be the most affective, and although it would be useful to be see weither its day or not in some places, i decided that i wanted my circuit to alarm weither its day or night because burglaries occure mostly during the evenings or the mornings this circuit has the same output as my product
Related products PT2 • this circuit shares the same output to my • Circuit depending on options available • Also the circuit is using a reed switch which is the same as my choice, reed switches are very common in burglar alarms as they are very effective , which proves why they are so popular. This circuit has a transistor which is the Same as my choice
Design brief • I am going to design a product, that will detect when your shed is broken into. • The burglar alarm plans to prevent and add the sense of security to the user and it can really help to make people feel secure • Input: • Reed switch for the window and doors usage, the push to make switch in use if a pressure mat is for placing within the shed to let the user know if the shed valuables are at real risk • Also I have put a reset switch so that the user has a easy reset after the detection • Process: • The process will be either transistor or Darlington pair but I think it will be transistor because the cost factor • Output: • Is a loud siren to instantly let the user know that their valuables are at risk • Other: • I have fitted a flashing L.E.D to add the safety and feeling of security to the user • Also fitted another L.E.D so when the alarm is activated it flashes
This is my first ever circuit This is my first circuit it is only one input which after re-assessing my data I decided that one input is not enough and that the fact the circuit latches on with no reset switch isn’t good enough ,see how I improved it into my next circuit
My second circuit This is my second circuit it works well with my two inputs easy to use. But after using it I noticed that there wasn’t a reset switch or a L.E.D to show the user that it is on. The circuit is also very difficult to put into pcb’s because of the logic gates
My finished circuit This is my updated version it works a lot better and as you can see I have put a reset switch into it also has a flashing led to add the feeling of security to the user as well as deterring some of the burglars to avoid the risk of being caught.
Circuit development options These are the building blocks of whic i have used in my circuit there are some alternatives for different results , on the not gate latch and power and output i have modified them in the power i have added a flashing LED in the not gate latch i have added a reset ptm And in the output i have added another LED
Circuit development options These are the alternatives to the inputs process and output i already use to still peform the role of a burglar alarm using the building blocks The LDR input and the tempreture input could work by detecting the burglar at dark as he enters the room i didnt choose this option is because it isnt as responsive as a PTM abd reed switch in nor gate with the converter to make it easy to put together in PCB form. The or gate was my first choice because its simple but as described it is hard to put together in PCB layout. The output of two LED’s is good but not good for warning the user in the night if they are not looking at it. Also it doesnt act as a deterant to the bulger after they have been detected also it doesnt warn those around the user.
My first P.C.B This is my first P.C.B it doesn’t have a reset switch or any flashing L.E.D’s for extra safety reasons, this also detracts from the sense of security and the user needs. This is my simplest circuit, I don’t think it would fully meet the needs of the consumer At this stage the copper fill it hasn’t been removed, which makes this a less sustainable circuit
My second P.C.B This is my second P.C.B it has the flashing L.E.D but it has two logic gate input gates which i originally didn't notice as a problem , but it is because I deliberately put At this stage I haven't removed the copper fill , this means that this is less sustainable
My finished P.C.B As you can see this P.C.B has blue wires because the circuit is to complex to map it complete it without blue wires, previously I have put this circuit with the nor gate and converter because that meant that it could use this circuit with only one logic gate input gate but hadn’t changed them all the one gate so therefore the whole process was a waste of time but fortunately I realized this and changed it so this became only one gate, the circuit also has a reset switch as another development Also I have removed the copper fill to make the circuit more sustainable. This in tern makes it more environmentally friendly . This circuit also has the pads sizes and pad holes changed size to make it easier in the building process (pad width 0.12 and height 0.12 the hole is 0.01 and the gap is 0.04)
Equipment used Printed circuit board (P.C.B) This is a thin board of insulating fibre with side of the borad coated with a layer copper. The components are mounted with a copper forming mount betwneen the board and the components, the board is later put into the etching tank where all eccess coppper is taken of so the borad is left with thin layers of copper on them. Etching tank A tank containing liquid ferric chloride that is used in the production of printed circuit boards (PCBs). The PCB is immersed in the liquid which is heated and then agitated by a stream of bubbles; unwanted copper cladding on the PCB is removed by a process known as etching.
Equipment used continued Once the PCB has been etched holes are drilled through the solder pads, for the insertion of component wires, using a 1mm drill bit. Soldering iron A hand tool used as a heat source for soldering. Soldering irons have a copper bit or tip for the efficient transfer of heat to the work being soldered. Most soldering irons used in electronics are electrically heated.
Practical building the circuit This is just after my first soldering having just soldered in the chip into the board, no problems were yet encountered, Equipment used soldering iron and working board This Is my original circuit board just after it was made and before I started work on it This just shows me checking to make sure I have the chip component in the right place before I solder it in, trying to avoid any potential mistakes from early on
Practical work continued This shows me checking the resistance values of the resistor before I solder them in, because having checked I realized that I was very close to putting the wrong resistor in And the picture below shows me checking to make sure that it was in the right place after checking that they were the right values Then the picture to the right shows me checking again as I solder another resistor in
Practical work continued (2) This shows me trimming the wires left sticking out after I soldered the resistors in to the board. I did this because it made it easier to work around the board and just for general access. This is just after I made the components for my pressure mat, I cut out 3 squares of cardboard to 20x20cm size I then took one of then and measured 5 cm in then cut out a 10 cm x 10 cm hole in it. The other two sheets were coated in a layer of tin foil. I made almost a sandwich with the three and put the card board sheet with the cut out in the middle of the two coated ones. I then got two wires measured then to 30cm then cut them to identical length. Then the first 3 cm of one end of each wire was removed then first 1.5 cm on the other, the shorter side was tinned and the longer was frayed and stuck onto the two outer sheets of cardboard with tin foil on them around about the edge as far away from the middle as possible. I then stuck the whole lot was later stuck together around the edge.
Practical work continued (3) The key stages of my practical work were only displayed and most of the rest consisted of the previously described steps of checking where the component goes on the printed circuit wizard diagram then double checking it was the right way round then soldering it in. Although most of the practical went to plan I did encounter a fortunately salvageable situation. It appeared that when making the pressure mat I hadnt trimmed around the edges well enough meaning that when I put the two together it made contact via the sides even when not being pushed upon, so as a result I took the whole thing apart again and then using a carpenters trimming knife I cut of all of the tin foil from the sides and then put it back together, it was a successful repair and now the circuit works perfectly
