hello sir, how are you. I read your proposal and i am interested in this project.
I have much experience on circuit design. I want to tell you that Raspberry Pi is much expensive for such type of application.
Let us discuss more.
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I am an Embedded engineer (STM32, PIC, AVR, Arduino, SOC BLE (bluetooth) chips, ZigBee, WiFi, GPS, LED, LCD display etc.) and PCB designer (Altium, KiCad, Orcad), 3D Modeling.
You can check my profile for more information.
thanks with regards
Preetpal Singh