Touched up the PCB and rerouted some wires.

I rerouted some wires on my PCB just for more organization and improved the via layouts. A lot of my BCU tracks are on the horizontal axis while my FCU tracks are going up and down vertical axis.

Here is the new BOM

Okay So i was asked to use anything but amazon so I did that however I am concerned for counterfeit parts. The price decreased about 10 dollars so that's good.

BOM - Sheet1 (1)

Added pictures of PCB

I updated my readme to include direct images of my PCB and the 3D image of my PCB. For any more PCB details, there is a folder in my github repo that says Ring PCB and Schematic. There are more pictures including the schematic and the direct files of everything including gerber.

Find the cheapest possible options and make the BOM.csv

I had a google spreadsheet, but I am downloading it into a CSV. Also I reduced the price by almost 30 dollars and found the ABSOLUTE best price including shipping. I tried to use some Aliexpress parts but they didn't have the exact thing I needed.BOM - Sheet1

I am making a more comprehensive CAD in Fusion 360.

I downloaded fusion 360, got the hang of it, then I imported my PCB stl file from KiCad and designed the 2 rings, embedded the pcb, added the battery, cut holes, hid the pcb away, and added the electrodes and a connecting wire. See the hole thing in Git Repo

Routed the PCB

I routed the SUPER tight PCB and used both top and bottom layers. I adjusted some pins in the schematic so I could get all the pins corrected with no interference or DRC errors.
I got this done in three long sessions:

OHH also I learned all about vias and track widths because I ran into an issue where the inner pins of the MCU were not able to be routed out, so what I did was reduced width requirements, then I made a smaller track, placed a via, and was able to get through that wall. Its screenshot is below

Layed out the PCB and got rid of Schottky diode.

I learned how layers worked, how to use KiCad PCB editor. I somehow layed out the PCB very tightly with no DRC errors. All of the capacitors are nearby their pins and resistors are in proper place. In this session, I updated my PCB from my schematic and also cut out the D_Schottky Diode. Here is my process in screenshots:

Set up the schematic/researched parts.

Learned everything about schematics, parts, pins, pads, nets, etc. Built a schematic for the PCB including the max30102 and the gsr sensor. I also fiddled with different LDOs and battery protectors.

I started out with a double NMOS but then decided to proceed without them.

I watched a lot of youtube videos on a guide through kiCad

Below, you can see my progress and process:

Figure out XCode

I had to learn how to use VSCODE and XCODE together and made some tweaks to my iPhone to get the app running and installed. Also had to figure out BLE permissions. Also learned how to send data BLE with some random BLE apps.

Built Arduino IDE code for MCU nrf52840

Built code for MCU nrf. This code sends the data connected from SCL, SDA, and analog 0 pins and transmits it over BLE with several different UUIDs. I looked at online guides to the max30102 sensor and also the gsr sensor, combined it, and learned how to use the Arduino BLE library. My last update to the code was 2 weeks ago. Again, I started this before but I have many variations to this code I will show: The code is linked in GitHub.

Created iOS flutter app for device.

First I created the flutter app running on XCODE iOS. It is linked in the GitHub repository. Small tweaks in the algorithm and filtering have been done. I know you want to see the process but I started this during the fall and I don't have anything to show for progress but I am constantly making UI tweaks, and new features. Last week I added the temperature feature that is on the max30102 to the UI.