This project is for a consumer electronics device. It will require a PCB (yet to be designed) enclosed in a .5 inch by 1/1.5 inch plastic mold. Height is less restricted but somewhere near .25 inches. It needs a coin cell battery CR1225 or smaller. Bluetooth BLE. It will ultimately work with a mobile app.
Right now, my goal is to get a preliminary product design completed. That includes the system level block diagram, the selection of critical components and a preliminary bill of materials.
After this phase I will move onto the schematic design and PCB layout.