Hey Peto, I'm Ahmed, I read your project description and I already passed with this problem before and hopes to help you with my experience.
I have been working with robotics application and Arduino for more than 3 years. During this period, I have built many robotics and Arduino projects either for college projects or for National and Local Competition.
Recently, I have built RC robot for Mine Sweepers Competition, which involved interface with many components like : Arduino, Raspberry Pi, Motors ,Metal Detector sensors, Encoders, Ultrasonic, IMUs, Solenoids, Gyro-Scope, Motor-drivers, Please give a look to the project video in my portfolio.
to take a look at my work samples please contact me.
As a result of my great need to land my first project on, I can give you much lower price compared to other bids and I will do my best to make you totally satisfied with the quality!
Hope to hear back soon!