Advice 1: How to make a copy of the key for the intercom at home

Using Arduino you can make at home a copy of the key, and the intercom 15 minutes, if, for example, the workshop closed and the key is needed urgently. Let's see how it's done.
Make a copy of the key for the intercom using Arduino
You will need
  • - Arduino;
  • computer;
  • - key for the intercom type iButton or 1-wire;
  • key blank to create a "clone" of the original key;
  • - 1 resistor of 2.2 kOhm;
  • - connecting wires.
Instruction
1
Each key for the intercom has its own room - this room serves as a key identifier. It was on the room key intercom solves your or someone else's. Therefore, the copy algorithm like this: first you need to know the number of "permitted" key and then assign this number to another key - clone. To intercom there is no difference, was applied to the original key or its copy. Checking the number against its database of allowed numbers, he opened the door.
Keys for intercom, which we will connect to Arduino (sometimes called iButton or Touch Memory), is read and written via the 1-wire interface 1-wire. Therefore, the connection scheme is very simple. We need a couple of wires and a pull-up resistor of 2.2 kOhm. The scheme shown in the figure.
Connect the key for the intercom to Arduino
2
To work with 1-wire interface there are ready-made library for the Arduino. You can use like this: http://www.pjrc.com/teensy/arduino_libraries/OneWire.zip. Download the archive and extract the folder "libraries" folder of Arduino IDE. Now we can simply run the Protocol.
Download Arduino the standard way the sketch shown in the illustration.
The sketch read the key number from the intercom
3
This sketch shows the key number for the intercom that is connected to the circuit. This is what we need now - we need to know the key number, a copy of which want to do. Connect the Arduino to the computer. Start monitor serial port: Tools -> Monitor serial port (or keyboard shortcut Ctrl + Shift + M).
Now connect the key to the scheme. The port monitor will show the key number. Remember this room.
Know the key number, which clone do we do
4
Now rewrite the sketch so that he could record the data in the key memory. Code given in the illustration. In the code given detailed comments. Most importantly, do not forget to specify the number of your original key in the array key_to_writethat you learned earlier.
The sketch to program the iButton key
5
Upload this sketch to Arduino. Open the monitor serial port. Connect to the schema key to be a clone of the original key. The result of programming the serial port monitor will display an appropriate message.
6
1) If when you compile a sketch, an error will occur [ WConstants.h: No such file or directory #include "WConstants.h" ], it should be in the file "OneWire.cpp" replace the first block after the comments on the following:

#include "OneWire.h"
#include "Arduino.h"
extern "C" {
#include "avr/io.h"
#include "pins_arduino.h"
}

2) If while compiling you get error "class OneWire has no member named read_bytes" or similar, then find another library OneWire, the Internet is a lot of them.
Note
Keys for intercom come in different types and families. This code will not work for all keys, but only for RW1990 or RW1990.2. The programming key may result in key risks.
Given the desire, it is possible to rewrite the program for different type of key. For this you need to find a description for Your key (datasheet) and correct the code of the sketch according to the description.

Advice 2: How to make a key to the intercom

Almost all the entrances to the houses today are equipped with intercom keys. Perhaps you lost your key and need a new one. To make it fast enough, if you turn to professionals.
How to make a key to the intercom
Instruction
1
Contact the firm which installed the intercom on your entrance. As a rule, address and phone number of the company is written right on the front door from the street, under the door lock. If the information is not there, ask the elder on the porch or the neighbor that initiated at the time collecting money to install an intercom system.
2
Order your universal intercom key. Offer this service now, almost all workshops on manufacturing of keys. However, note that it is your intercom device key universal may not be suitable, it is a matter of luck. Typically, these keys contain a limited amount of codes is calculated for several different intercoms in the area. But does your entrance in these few, you can learn only by experience.
3
To make intercom key itself is practically impossible, if you are a hobbyist or programmer. If you do decide, you will need a programmer. You can try to make your own Internet based schemes or to buy.
Note
If you submit to the workshop door key and ask them to make you duplicate work is not very time consuming.

Advice 3: How to make a copy of the key

Have you lost the key to the apartment where the money is? Do not despair. In that case, if someone from home was still the second instance, you can personally make a copy of the key in a home workshop.
How to make a copy of the key
You will need
  • Bench vise, file, needle file, modelling clay
Instruction
1
For the manufacture of the duplicate key , you will need to match the shape and size of ingots-blanks, a set of files and needle files, as well as skills bench skills.
2
The first way to make a copy of the key, concerns the so-called "English" flat keys. Take the workpiece and carefully aligning with the original key clamp in locksmith vise.
3
Files of different cross-sectional shape and size to consistently choose the metal in the billet. The original key is a kind of template. A specialist workshop this process is performed on the machine within minutes. It is possible, if you have a process of removing the copy key will take significantly more time.
4
Check you have made a new key in the lock. If it is unlocked with the effort, again align the copy key with the original and bring copy to mind. This job requires certain skills with the plumbing tool.
5
For another way of removing the copy with the key you'll need clay. Take a block of clay from an ordinary child's set for modeling. The original key attach to the flat surface of the clay bar and press it to half the thickness of the key.
6
Turn the key and do the same again, making a key depression in the clay with the other end of the bar. You now have a full cast of original key. This method, incidentally, can often be seen in detective and spy movies.
7
Now it is small – you should use all of those Handtools to bring a suitable size prepared in advance the blank into conformity with the mold. The cast need to from time to time to attach to it a copy and check the new key according to the original. Ideally, all projections and depressions on the duplicate copy must exactly match the "native".
8
A copy of the key ready. Check it out at the castle and try not to lose.

Advice 4: How to know the entry code

It should be noted immediately that the universal intercom code does not exist. Code the specific intercom can be found by referring to the installer of the apparatus. If there's no time, then you can use the following instructions.
How to know the entry code
Instruction
1
Intercoms Vizit firms are more reliable and therefore one of the most popular. Their codes vary widely. Sometimes the keyboard is missing the sprocket and the bars, and in their place are the keys C and K, respectively.
2
If the installer was not changed the default settings of the intercom Vizit, the door should open when you enter the code *#4230 or 12#345. For newer versions of devices suitable combination *#423 or 67#890.
3
If the above codes do not work, then you can open the door using the service menu. To do this, dial #999. Then wait for two short beeps, then enter the master code. The intercoms firms Visit the default master code is 1234. If you then sounded one short beep, then the master code is entered correctly. If the signal was two-tone no. In this case, try the following variation codes: 12345, 0000, 9999, 3535, 6767 or 11639.

From the service menu you can open the door intercom without the key. To do this, press the following key combination 2-pause-#-pause-3535.

To exit the service menu press *. The # key is used to confirm to the program of intercom system changes.
4
Also, problems can occur with intercom Vizit BVD-3xx. This model has no display and led indicators. To open a lock like this should go in the service menu as described in the previous paragraph, and then press 1.
5
To pick up code will not work and the intercom Vizit model BVD-34х. You can tell by the left receiver.
Note
Any person may occur such a situation that he will have to make use of these recommendations. But it is worth remembering that the opening of the intercom for personal gain is punishable under the criminal code.

Advice 5: How to make hard cheese at home

Cottage cheese to cook is not difficult, and although it consumed a lot of milk, the result always pleases fans. However, in order to prepare cheese at home, you will have to get pressure, otherwise you will not be able to remove excess fluid.
How to make hard cheese at home
You will need
    • press;
    • form cheese;
    • a large clay pot;
    • the colander;
    • a long knife;
    • 8 bricks;
    • 2 large piece of cheesecloth;
    • 2 cups fresh milk (to ferment);
    • 4.5 l of cow's milk;
    • 4 tbsp. butter;
    • 3/4 tsp of baking soda;
    • 2/3 Cup of sour cream;
    • 1/4 tsp salt.
Instruction
1
Make the starter: Express 2 cups milk at room temperature for a day.
2
Add yeast to 4.5 liters of warm milk, cover the container with a lid and leave in a warm place for 12 hours.
3
Place the container with the curdled milk into a large, filled with warm water. Put them on a small fire, use a thermometer to monitor the heating water should heat water to 38оС for 30-40 minutes and maintain this temperature until the mass reaches a sufficient density.
4
Determine the moment when the mass can be cut with a knife, cut the curd with a long knife into cubes 3 by 3 cm, right in the pot, then with a long spoon and mix them up, trying not to mash and to prevent the sticking of the cubes. Check out the pieces on density: gently squeeze your fingers and quickly release. If the piece is easy to break into pieces, does not stick to hands, it is possible to end heating (usually heat lasts from 40 to 60 minutes).
5
Drain the whey using a colander, line a rimmed gauze form for cheeseand (any container with holes in the bottom), put the cheese mass. The ends of the cheesecloth tie the top, place the mold under the press. Put on the upper Board press 4 bricks, then add one brick every ten minutes, giving freely to drain the serum. In conclusion, leave the ground under the weight of 8 bricks per hour.
6
Remove the mass from the mold, add the butter and baking soda, chop them with a knife in small pieces to mix well with butter and soda. Put in a clay pot, tightly clutching a weight to the bottom, leave in a warm place for 2.5 hours.
7
Add the weight of the sour cream and salt, stir. Put in the form of heat (smaller capacity with cheeseom more full of warm water). Put on a slow fire, stir until the solid compounds of sour cream with mass. Then pour the mixture into the pot, greased, and put in the cold. Observe cheese for 2-3 months.
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