Wearable AI PCB Design

flux

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Work completed
  • Defined project description and system architecture diagram.
  • Added all major ICs (U1 ATSAMD21G18A-M, U2 MCP73871-2CCI/ML, U3 LSM6DS3TR).
  • Added active components: SW1 tactile button, D1 status LED.
  • Placed decoupling capacitors (C1–C10) and pull-up resistors (R1–R6) with appropriate values and ratings.
  • Added connectors: J1 USB micro-B, J2 JST-PH battery, J3 microSD socket, J4 4-pin I2C header, TP-1–TP-6 test pads.
  • Fully wired schematic nets to satisfy power tree, MCU, IMU, OLED, and microSD interface requirements.
  • Reviewed and updated all passive and active component properties for voltage, power, package, and footprint compatibility.
  • Verified and updated footprints for every component.
  • Defined board outline size at 45 mm × 30 mm and added four mounting holes for wrist attachment.
Tasks remaining (unmarked)
  • Assign manufacturer part numbers to generic resistors and capacitors for availability.
  • Review schematic and layout for manufacturability and generate a to-do list of any issues.
Tasks I cannot perform
  • Configure the board stackup to a 2-layer PCB.
  • Designate copper layers for the ground plane and configure ground fill.
  • Classify nets by type (power, I2C, SPI, USB, signal) in the project.
  • Set trace widths for power nets and configure USB D+/D− impedance rules.
  • Place components on the board according to ergonomic and IMU-centric placement.
  • Route all nets using auto-layout.
  • Review the routed board for DRC/ERC compliance.
Success criteria review
  • ✔️ Complete schematic with integrated Li-Po charge/protection, 3.3 V regulation, and correct peripheral connections.
  • ❌ 2-layer PCB layout with ground plane (stackup and ground fill not yet configured).
  • ❌ Production-ready outputs (BOM, pick-and-place, Gerbers not yet generated).
Recommended next step
Proceed to the manufacturability review phase: assign manufacturer part numbers to generic components, then configure the 2-layer stackup and ground-plane copper fill. After that, you or your team can finalize component placement and routing, perform DRC/ERC checks, and generate manufacturing outputs.

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U2
TP-5
TP-2
U2 VBAT_2 - C8 P1
R6
Resistance
10kΩ
U1 VDDIO - U3 VDD
U2 IN_2 - C5 P1
R4
Resistance
10kΩ
C7 P1 - C1 P1
U3 VDDIO - C6 P1
R1
Resistance
4.7kΩ
U1 VDDANA - C4 P1
C7 P1 - C1 P1
R2
Resistance
4.7kΩ
U3 VDDIO - C6 P1
TP-1
U2 IN_2 - C5 P1
R3
Resistance
10kΩ
U1 VDDANA - C4 P1
U1 VDDIO - U3 VDD
C2 P1 - C9 P1
J2 PIN1 - U2 VBAT_1
TP-6
TP-4
U2 VPCC - U1 VDDIN
R5
Resistance
10kΩ
TP-3
U1 VDDCORE - C3 P1
J1 VBUS - U2 IN_1
U1 VDDCORE - C3 P1
U2 VPCC - U1 VDDIN
J2 PIN1 - U2 VBAT_1
U2 VBAT_2 - C8 P1
C7
Capacitance
0.1 uF
C10 P2 - D1 K
C6
Capacitance
0.1 uF
C8
Capacitance
0.1 uF
U2 VSS_2 - C1 P2
U2 VSS_2 - C1 P2
GND
GND
C3
Capacitance
0.1 uF
GND
C10 P2 - D1 K
C8 P2 - C9 P2
C4 P2 - C5 P2
C1
Capacitance
0.1 uF
GND
C5
Capacitance
0.1 uF
C2
Capacitance
0.1 uF
C4
Capacitance
0.1 uF
C4 P2 - C5 P2
U3
SW1
U1
J2
D1
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    16.1k
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • RMCF0805JT47K0
    RMCF0805JT47K0
    General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
    jharwinbarrozo
    1.1M
  • 1070TR
    1070TR
    Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
    jharwinbarrozo
    700.5k

AcclGyro

AcclGyro thumbnail
Battery-Powered MCU Sensor Board with Peripherals

Properties

USB, Battery

flowchart TD Battery["Battery"] Charger["Charger/Regulator"] MCU["MCU"] IMU["IMU"] OLED["OLED Display"] MicroSD["microSD"] USB["USB"] TestPads["Test Pads"] Button["Button"] LED["LED"] Battery --> Charger Charger --> MCU MCU --> IMU MCU --> OLED MCU --> MicroSD MCU --> USB MCU --> TestPads MCU --> Button MCU --> LED

Buttons, Display

Arduino

USB

solderpad.org/licenses/SHL-2.1/

Consumer Electronics

Pricing & Availability

Distributor

Qty 1

Arrow

$3.43–$3.51

Digi-Key

$6.13–$6.33

LCSC

$6.91

Mouser

$3.76

TME

$1.39

Verical

$4.45–$10.93

Controls