Hello,
My name is Andrei, i am a Romanian IOT Developer with a lot of experience in IOT projects and automatics .
I have in the past the same issue , and i have made it but with wifi.
I propose you a solution with Arduino modules :
- 2 pics of 4 Digit 7-Segment Display - to can make E and 16384
- 1 SD card module
- Arduino nano
and after i can design you a new schematic and pcb design for mass production .
I can work with all types of Microcontroles programming in C , C++ , Mikro C , CCS C , Atmel Studio , Arduino , gcc .
Creating Schematics and PCB in Kicad , Eagle , EasyEDA and Proteus (+simulation).
i have an workshop full of parts and the infrastructure to build PCB and test the solution end to end using special tools (Spectrum analyzers , oscilloscope , logic analyzers )
Derivable on the project :
Wiring diagram for prof of concept .
Schematic design
PCB Design
Gerber files for manufacturing
Arduino code explained every line .
As an additional service i can make you a full working prototype and ship to you.
Regards,
Andrei