I had the same problem 2 years ago, am an engineer graduated from wales university,
I can make this project with high efficiency, Low cost & max 3 days, I have a good experience with sensors, Arduino, Raspberry Pi, microcontrollers, c, c++, python, java, android, etc......, I also have made up my own libraries that help me in coding to finish up any project in little time, which is great for this project.