Ўзбекистон республикаси ахборот технологиялари ва коммуникацияларини ривожлантириш вазирлиги муҳаммад ал-хоразмий номидаги

part of the research is designed with the CISCO PACKET TRACERT 7.2 simulator 
program. One of the advantages of this simulator is that you can see all the processes 
with your own eyes. You can also write program code to devices in all languages, 
including Python, Java script, php, C ++, and so on. The practical part of the 
dissertation was designed into 3 scenarios. 
1. Smart city 
2. Smart home 
3. Smart office 
The following model is created with Cisco Packet Tracer version 7.2. Devices 
needed for this model are: 
1. IoT servers 
2. Cisco routers 
3. Cisco switches 
4. IoT devices 
5. Sensors and actuators 
First of all, we assemble a diagram of the devices we need for this area. 

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Smart City. The IoT devices in this scheme are connected to the Wifi device, the 
Servers are connected to the central Provider Router via a switch, and the 
Smartphone is connected to the router from the central server via the Base Station. 
This scheme has been made as simple as possible. 
Fig 3.2. Smart city model 1st scenario 
In this scheme, a smart city model is created. According to the model, one of the 
most common problems in smart cities is getting traffic jams. Many smart devices 
have been used in this model in order to avoid the problem of traffic jams in the 
streets of smart cities. The working principle of this scheme is that if the number of 
cars at crossroads increases, the signal transmitted by the ultra-distance sensor is 
transmitted directly to the server. The server processes the data and sends a signal to 
the traffic light. The traffic light starts working. 
This example is for illustration purposes only. If there are 4 routes at an intersection 
and there are no cars in both directions, and there are no cars in the other two 
directions, a model of green lights is generated for those two loaded directions.
Taking into account the quality indicators of this model, we can note its convenience. 
This creates great convenience for drivers rushing to their destination. A green light 
for idle traffic and a red light for busy and busy traffic will allow vehicles to stay at 
intersections for longer periods of time. This model is not for all intersections in our 
country. Perhaps this is for junctions with relatively low traffic or no traffic at all. 
Now let's see how this model works.
Fig 3.3. Smart city 2
nd
model scenario 
Now let's look at this diagram again. When cars approach an crossroads, the 
ultrasonic sensor processes the signal returned by the car and sends a signal to the 
server that the car is parked in that direction. The server, in turn, sends a command to 
the traffic light to turn on the green light. This reduces congestion on a busy route if 

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other routes are empty. The principle of operation of IoT devices is based on the 
principle of operation of a sensor and an actuator. That is, the ultra-range sensor 
sends a signal to the traffic light, which acts as an actuator, due to changes in the 
external environment. 
In this model, a different situation was considered. Automatic shutdown of 
street lights at nightfall. This model works under the influence of sunlight rather than 
clockwise. According to the model, if the sunlight does not reach the sunlight sensor, 
a day message is sent to the server. The server processes this information and does 
not send any commands to the street lighting system. We can see this situation in the 
diagram below. Note that in the diagram, sunlight hits the solar sensor. The street 
lighting system does not work accordingly.
Now let's look at the second scenario. That is, if the sun's rays do not hit the sun 
sensor, the sensor will notify that it has become dark. As a result, the server sends the 
command the street lighting system to turn them on. 
Here we can observe this situation.
Conclusion.