Dimitar Rangelov

I am a Inventor

Dimitar Rangelov

Born in Bulgaria. But now I am living in Enschede, Netherlands. I graduated computer technology and technology in Bulgaria. I deal with electronics from 5 years. Now I am studying Electrical and Electronic Engineering at Saxion University of Applied Sciences.

  • Enschede, Netherlands
  • +31 630937625, +359 884289821
  • dimitar.rangelov9@gmail.com
    dimitar.rangelov@colorblind.tech
Dimitar_Rangelov

My Professional Skills

I have multiple and different professional skills acquired during internships and company work. Below I have shown some of the most important skills and also many of the skills have belong to major clusters I have also shown.

Embedded Engineering 90%
Inventoring skills 85%
C and C++ Development 75%
Full Stack Development 60%
0
completed project
0
lines of code
0
hours working
0
current projects
  • Firefighting drone - Saxion

    Firefighting drone - Saxion


                      The aim of the project is to collect fire samples to investigate the causes of these fires.I am responsible for the electronics that have to be added to the drones for sampling.

    Fig 1.1 Schematic of the controlling part
                    The schematic of the Fig 1.1 is made and simulated with MultisimMultisim is an industry-standard, best-in-class SPICE simulation environment. It is the cornerstone of the NI circuits teaching solution to build expertise through practical application in designing, prototyping, and testing electrical circuits. 

    Fig 1.2.1 PCB without polygon
    Fig 1.2.2 PCB with polygon ( Top )
    Fig 1.2.3 PCB with polygon ( Bottom )
    Fig 1.2.4 PCB with polygon ( Top and Bottom )
    Fig 1.3.1 3D model of PCB ( Top )

    Fig 1.3.2  3D model of PCB ( Bottom )

    Fig 1.3.3 3D model of PCB 



                         The PCB of the Fig 1.2.1, Fig 1.2.2, Fig 1.2.3 and Fig 1.2.4 is made with Ultiboard. Also the 3D models of the PCB of the Fig 1.3.1,Fig 1.3.2 and Fig 1.3.3 are made. Ultiboard is a rapid printed circuit board (PCB) prototyping environment used by engineering professionals, educators, makers, and students across many applications.

                       If you want to see more information about the program will be posted the full code below.
  • Dalton - Software for colorblind



    NFORMATION OF COLORBLIND
                Let's start with a little bit of statistics. About 8% of Аll men and about 2% of all women are suffering from color blindness (colour vision deficiency). This means chances that your neighbour or one of your classmates is colorblind are very high.

     
              
       There are three types of color blindness we can help:

                -  Deuteranomaly - Deutan color vision deficiencies are by far the most common forms of color blindness. This subtype of red-green color blindness is found in about 6% of the male population, mostly in its mild form deuteranomaly.

                - Protanomaly  - Red-green color blindness is split into two different types: Whereas people affected by protan color blindness are less sensitive to red light.


                -  Tritanomaly - People affected by tritan color blindness confuse blue with green and yellow with violet. So the term blue-green color blindness would be most accurate because the colors blue and yellow are usually not mixed up by tritanopes.



                 Dalton is software allowing people with different kinds of color blindness (colour vision deficiency) to see more colors.

                Dalton provides solutions to some of the everyday problems experienced by colour blind people. People with various types of colour deficiency could benefit from the use of Dalton software including those affected by Tritanopia (blue colour vision deficiency), Deuteranopia (green), Protanopia (red).

                 People generally have the assumption that if you suffer from blue-yellow color blindness these are the only colors you have trouble seeing. But that’s wrong. Color blindness doesn’t relate to just two color shades you can’t distinguish, it is the whole color spectrum which is affected.


  • Remote control cockroaches


    Attempts to remote control of live cockroaches through their nervous system 


    Schematics of neural mapping of discoid cockroaches and responses to stimulation of some ganglia



    In the first picture is  the location of the first thoracic ganglion and in the second picture is the placement of two electrodes for localized stimulation in discoid roaches.

      The main principe of working is that you have one transmitter and one receiver.The receiver is connected to the ganglion of the cockroach.From the transmitter you send a signal to the receiver where you want your cockroach to move.When the receiver has this signal just put some voltage impulses to the electrodes and they directly to the ganglion.I made so much experiment to understand the full concept of it because was 2015 and in the internet was no so much information about that. Most of my experiments were online in my last blog and most of them are deleted.Most of my work in this project is deleted or lost.
  • Smart Solution for road traffic

    AUTONOMOUS SELF-REGULATING SYSTEM CONCERNING ORGANISATION AND REGULATION OF ROAD TRAFFIC

    Purpose of the system

              
              The topic of road safety is up to date and problems of road safety have increased in recent years at European and national level. Protecting the life and health of people involved in traffic is a priority.
                The vision of road safety is a description of a desirable state in the future based on a theory about the way in which the various components of the traffic system interact or must interact.


              Signals and markings can provide important information to improve road safety. They guide, warn and direct road users. When people know what to expect, chances are greater that they can react and behave accordingly. Traffic participants can process at once only a limited amount of information. Too many signs of a section may confuse and distract participants in the traffic rather than help them. Too many signs may also result in non-observance and ignoring them. In order to reduce the use of valuable raw materials, to improve road security and safety,  to decrease the number of motor vehicle collisions / MVC/, I have devised this autonomous self-regulating system concerning the organization and regulation of traffic. This system can promptly alert in case of a MVC and depending on weather and road conditions to limit speed. Dynamic speed limits can help to harmonize traffic flow and to increase traffic flow in areas with high traffic, improving road safety and having major impact on the speed of motor vehicles in order to prevent from traffic accidents. They adapt to the surrounding environment being climate (fog, a very strong wind, rain, snow, ice over road pavement), mechanical obstacles (landslide of earth and stones), traffic jam from various reasons. 

    Aim of the project

    The project aims at establishing a system to improve road safety. It is a long-term purpose without a specific framework in time. On time, the submitted up to date traffic information through the system will lead to preventing and reducing the number of road accidents.

    Functionality of the system

                The system for organization and regulation of traffic is completely autonomous.  It changes the speed limit according to the surroundings. This is called dynamic limitation, which helps the transport flow and security on the road and reduces the number of MVCs. Most often the system is adjusted to climatic conditions. An example of such conditions is fog, a very strong wind, heavy rains and many others. According to these weather conditions it changes the speed limit. When conditions are not presupposed for driving at a high speed, the system reduces the speed limit and vice versa, when conditions are presupposed for driving at high speeds, the system increases the speed limit. Depending on the location of the system, it is with a different main speed limit. If it is located in an urban area, it takes into consideration to restrict to the speed limit permitted in settlement. If it is placed in uninhabited locations, on a road or a highway, the speed limit will be consistent with the location. The system can be changed during intensive traffic.
                     An important feature of the system for organization and regulation of traffic is signaling in case of a MVC. By reporting a traffic accident, the system knows that it is necessary to put warning signs. Thus, until a police car arrives, other cars will take heed and will avoid other accidents or chain car crashes due to inattention or not so quick reflexes of some drivers.


                 Creating a web platform will enable a user to see the locations of the systems for organization and regulation of traffic and their coordinates. There will be not only coordinates in it, but, in addition, there will be a phone number and it will be different for each system. By issuing an alert via sms it will be known precisely to which system the corresponding signal is supplied. This will be a warning signal for the drivers.
                 Sign № A39 is a road sign from the group of warning signs for attention. The system changes the sign from a speed limit sign to a warning sign for attention. This functionality makes roads more secure and safer, reducing risks of new MVC and secondary accidents, and most importantly, it prevents the lack of unawareness of the drivers until police arrives.

    Operating principle, scheme of the principle and elaboration

    In the autonomous self-regulating system of the organization and regulation of traffic there are multiple sensors and modules that allow the system to navigate in the surroundings and to receive signals for MVC and other accidents.
    In order to see the position of the sign through the web platform the system has GPS and WiFi modules that allow all this to be in real time. The visualization of the system is carried out through a set of matrices that are made of 520 LED that glow bright red. The diodes are bright, so that the drivers can easily notice what the system is visualizing during the day and night, even in surroundings with reduced visibility. Through a system with a phototransistor and multiple diodes of high brightness the matrix is automatically adjusted. The bright diodes have a large viewing angle and allow drivers to see clearly what is displayed on the system from many different angles. The matrices are insulated by a silicone layer on the inside of the system. This extends the life of the system and prevents the entry of moisture and sudden stopping of the system.


    The matrices of diodes can visualize two basic configurations. One of them is to show a warning sign and the other shows a sign for speed limitation in the relevant 10, 20, 30, 40, 50, 70, 80, 90 km/h. Depending on the sensors for pressure, temperature and air humidity, the system displays many varieties of limitations. The sensors are attached to the mounting box by hot links, so they can be easily replaced in case of damage. An example of a visualizing restriction on the value from a sensor is when the temperature drops and the designated limit changes to a lower value. In a period of values of the sensors а visualization image remains in its basic state and can be adjusted depending on the location. In settlements it will be 50 km / h. This matrix is set to a box for installation, which allows the matrix to be removed and to be replaced with another matrix in the most simple and accessible way. The purpose of the box is to protect from external climatic conditions. It is attached to a mounting tube, which implies easy placement of the system in different places. Except the sensors and the matrices that can be removed in a quick and easy way, in this installation box there is a great deal of modules which communicate with each other.

    The system has GPS and WiFi modules. The GPS module is attached to the mounting box and has a warm bond through which in case of defect it can be replaced with a new one easily and quickly. The antenna module is easily replaceable and if there is damage, it can be changed without moving or removing the module from the device. The GPS module is showing the location of the system in real time.
    The Wi Fi module is attached to the mounting box and is connected with a warm connection to allow in case of damage to be replaced quickly and easily. It is insulated with a thin layer of silicone that protects it from moisture and it extends the life of the module. The Wi Fi module takes information from the GPS module, which is the actual location of the system, and via 3G or 4G communication transmits this information to the Web platform that processes it and makes it available to users.
    The system has a GSM module, which is fixed to the mounting box and is bound by cold connection because failure upon it is unlikely. It allows the user to put a card of the mobile operator, and through that card the number of the system can be changed easily and quickly. If you change the card and therefore the number, the WiFi module will give new information to the Web platform and the user will have access to the latest information. Via the GSM module the system receives signals for MVC and other accidents and then the matrices of the system display a warning sign. The GPS module can receive many signals simultaneously and pass the information to a microcontroller that processes the data. It is the main component of the system. It is placed in the center of the system and every module, sensor and matrice is connected to it because it processes the whole information and tells what the matrices to visualize. The microcontroller is set to an accessible place so that when it defects the problem to be removed quickly and easily. The entire structure is made secure, easily accessible and functional.

    Parts that are being used

    ·         Microcontroller Arduino Mega 2560 that processes all the information and is able to be built on it with a lot more functionalities of the system. It is easy to find and accessible to everyone, but it is difficult to be repaired, so it is recommended upon damage to be replaced with a new one.
    ·         Sensor for temperature and humidity DHT11 - it allows to simultaneously measure the temperature and moisture levels slightly diverging from the actual ones. It is easy to find and repair.
    ·         Sensor for pressure and temperature BMP180 – it allows measurement of pressure and temperature and can display at what altitude the system is. It is easy to find and to repair. In the measurements of temperature and pressure there are no deviations from the actual values, if there are any, they are not very noticeable. There are deviations from the actual values of the altitude, but the difference is very small.
    ·         Super bright red diodes with a large viewing angle – 520 diodes.
    ·         Resistors for the super bright red LED – 520 resistors.
    ·         Mounting box which is isolated from external climatic influences, and a mounting tube which can easily be placed anywhere within the site.
    ·         Wi Fi module ESP8266. This is the most used and most reliable module. It is easy to find, but can't be repaired, it can only be replaced if damaged.
    ·         GPS Module Aircraft Flight Controller. It is easy to find and easy to repair. It consists of two parts: an antenna and a circuit board. Each of these parts can easily be replaced. The antenna can be detached and can be replaced with another in case of damage and there is no need to change the whole module. This makes it more desirable than others. It is the most used GPS Module.
    ·         GSM module - a simple module with a card slot that allows the user to change the cards of mobile operators and thus change the number of the system. It is a well known and used module that is simple and easy to find. It requires no maintenance.
    ·         Phototransistors that regulate the brightness of the LED.

    Sustainability and development of the project

    The micro controller allows upgrading the system. The idea is to add additional sensors for better and more complete information of the system receiving the changes from the surroundings. The perfection and the mobility of the system can be achieved by using platforms not only for smartphones and computers, but also for Android and Iphone apps. This will ease the access of a greater number of users.

    Summary

    The topic of road safety is up to date and problems of road safety have increased in recent years at European and national level. Preserving the life and the health of the people participating in road traffic is of top priority. Signals, signs and markings can be of great importance for increasing the road safety. They control, warn and guide drivers.
    The goal of the project goal is creating a system that can improve safety on the road. It is a long-term purpose without a specific frame in time. By giving correct information about the road surroundings it could prevent and reduce the number of car accidents.
    The system for organization and regulation of the traffic is completely autonomous. According to the surroundings, it changes the speed limit. That dynamic restriction helps the traffic flow and safety on the road.
    An important function of the system is signalizing and receiving current information. This is achieved by using a web platform. The platform gives an opportunity to localize where the systems for organizing and regulation of the traffic on the roads and their coordinates are. Except the coordinates there will be a mobile phone in the system. By sending a signal through a text message it will be known just to which system this signal is being forwarded to. This message will initiate a warning signal for car drivers.


    Sign № А39: “Attention! Other dangers” is a road sign from a group of warning road signs of dangers. The system will change the sign for speed limit into a warning sign for attention. This functionality of the system will make the roads more secure and safer, it will reduce the risks of more car crashes and a multiple pile-up, the most important thing is that it will inform drivers of the accident, until the police arrives.
    For the moment the system is designed for smartphones and computers only, but the idea is to install additional sensors for better and more complete information about the changes in the surroundings. The perfection of the system and its mobility can be achieved by using platforms not only for smartphones and computers, but also for Android and Iphone apps. By doing this, we will make the access easier for a greater number of users.


  • Smart Pet Feeder - 24Catchen

    Резултат с изображение за PCB pet feeder

    Pet Feeder 


    The Problem:
    If you are lazy like me and my friends or forget every time to feed the cat or the dog than you are in the right blog.I have one more question before to start.Have you ever gone to a far away and cannot take your sweetheart (pet) with you?This was the problem of my friends.They have to go to Ireland but they have 3 cats.This is a big problem and i will show you the decision.

    The decision:
    Aim:

    To feed your pet from distance.For example if you have abroad can fill the tank and feed it through the website. The food in the tank will go for 1-2 months.Through the camera will be able to see the animal and seeing if there is a problem with the feeder.

    Materials:


    1 x Water bottle 10L    price: 3-4 
    1 x hc-sr04 ultrasonic sensor  price: 1-3€ 
    1 x servo motor 9g  price:3-4€ 

     


    1 x raspberry pi 3 kit

    Guys i recommend you to buy the kit because you will have supply and sd 16GB card for your raspberry pi + the raspberry pi 3  for only $64.99.The price of the raspberry pi 3 normally is approximately 40-45$.I will show you two options with the kit and only raspberry (if you have normal supply (smartphone supply) and sd card more than 4 GB).
    Option one with the kit: HERE
    Option two only raspberry pi 3 : HERE


    1 x normal USB camera price: 1-10€ 
    1 x trash bucket price: 1-5€ 
    2 x small pipes
    1 x pipe knee 45 degrees
    1 x disc (like DVD disc or CD disc (no matter what because it will shred))
    2 x resistor 10Kohm
    Cables
    Soldering iron
    Hot glue

     How to make it

    Set up the raspberry pi

    Firstly you have to set up your raspberry pi.You can found how HERE
    Sorry guys this indian explain very well but have annoying indian accent.

    The schematic

    Here you can see how to connect the servo and the sensor.Leave long servo cables.They have to be long like 40-45 cm.The sensor cables have to approximately 20-30 cm.
    You have to connect one more thing.The USB camera in the USB port.


    Test Codes

    You have to start test codes if you wanna see if something is disconnected and if everything works.
    Sensor test code : HERE 
    Servo test code: HERE

    The construction 

    Use the pipes as the feet of our stand (bucket).The pipes have to be around 50 cm.the pipes propped on the ground go to the bucket and pass through holes in the four diagonal on the bottom of the bucket .And enter in the bucket.The pipes inside the bucket grip screws to it. Cut the bottom of the bottle.You must pierce a hole in the bottom of the trash and put the bottle upside down there.You can stabilize the bottle with something to sit still.
    The bottle will use it as a reservoir for food.There we will put the food.The bucket will play a role to stand the bottle.The pipes are the feet of the construction.





    Something similar is to be obtained.
    The construction have distance from the floor because have 4 feet.
    We will use this distance to put the pipe knee 45 degrees.

    In this pipe knee the food will run to the bowl.This pipe should go on the neck of the bottle to be fed from the bottom of the bucket.You have to put the servo and the disk at the front of the knee.there should be two positions open and closed. 

    Open is like a hole in the pipe and is the food falls. Closed when the disk covers the opening of the pipe and the food does not fall.





    Demo Program

            If you did everything by now it's time to get up and running.The program is so designed that in this program the microcontroller monitors the status of the feeder and hosted website.You'll be able to feed your animals with a single click and watch them online. In real time if there is food for them and whether they eat their food.

    Firstly download the demo program from HERE
    Put the program on the desktop of the raspberry pi 3.To run the program you have to open the file with the name -- streaming-site.desktop.If you see this then everything works.


              In the place of our IP (82.118.254.89) have to  be your IP.You can open your site as you open the browser (can be chrome) and write the ip of your site.The ip will be like http://192.168.0.107:5002/. When you open the site you will see this.The site is hosted by your ip.


               The name of this feeder is 24 catchen. You can change it in the folder templates in the html file.This is the first header.The distance of the sensor  indicates whether there is food in the container (bottle).If the distance is approximately 21-23 than you do not have food in the container.You have to put food the container.Тhe container you can put 10 kilograms of food which is enough for your cat or dog for the next one or two months. Depending on the diet of the animal.If the distance is less than 20 cm then you have enough food in the feeder.If you click on the button Manual Close the food won't fall  from the feeder.If you click on the button Proceed 3 times the feeder will release three small doses of food which will be enough for your pet.Through the camera you can see if your pet eats and whether you feed him.You can also see if there are bugs in the machine.


  • Student Project - Bank Safe - Saxion


    Bank Safe - Saxion University of Applied Sciences - Student Project


                         The project was made in 2017 at Saxion University of Applied Sciences. This is a student project in first year in specialty Electrical and Electronic Engineering. The assignment was to make bank safe (schematic, pcb and after that make it real).
    Fig 1.1.1 Schematic of the Bank Safe


                                         The schematic of the Fig 1.1.1 is made and simulated with MultisimMultisim is an industry-standard, best-in-class SPICE simulation environment. It is the cornerstone of the NI circuits teaching solution to build expertise through practical application in designing, prototyping, and testing electrical circuits. 


    Fig 1.1.2 Prototyping schematic of the Bank Safe
           The prototyping schematic of the Fig 1.1.2 is made and simulated with Fritzing. Fritzing is an open source initiative to develop amateur or hobby CAD software for the design of electronics hardware, to support designers and artists ready to move from experimenting with a prototype to building a more permanent circuit.

    Fig 1.2 PCB without polygon

    Fig 1.3 PCB with polygon ( Top )

    Fig 1.4 PCB with polygon ( Bottom )

    Fig 1.5.1 3D model of PCB ( Top )

    Fig 1.5.2 3D model of PCB ( Bottom )

                         The PCB of the Fig 1.2, 
    Fig 1.3 and Fig 1.4 is made with Ultiboard. Also the 3D models of the PCB of the Fig 1.5.1, Fig 1.5.2 are made. Ultiboard is a rapid printed circuit board (PCB) prototyping environment used by engineering professionals, educators, makers, and students across many applications.

                       If you want to see more information about the program will be posted the full code below.

  • Colorblind - Dalton

    This one of the biggest project that i am working on it.

    Dalton is software allowing people with different kinds of color blindness (colour vision deficiency) to see more colors.

    Dalton provides solutions to some of the everyday problems experienced by colour blind people. People with various types of colour deficiency could benefit from the use of Dalton software including those affected by Tritanopia (blue colour vision deficiency), Deuteranopia (green), Protanopia (red).

    ADDRESS

    Enschede, Netherlands

    EMAIL

    dimitar.rangelov9@gmail.com
    dimitar.rangelov@colorblind.tech

    TELEPHONE

    +359 884289821

    MOBILE

    +31 630937625