Hybrid Smartwatch Design Inquiry

flux

Enlarged the PCB from 40 mm circular to 42 mm circular on a 4-layer stackup. This keeps it within the 44 mm case target while improving density from critical to high.
Open items:
  • Routing is still tight, especially around the ESP32/RTC/regulator area.
  • A few passives may still need to move to the bottom layer for clean routing.
Suggested next steps:
  1. Spread the crowded ESP32/RTC/power components.
  2. Move low-profile passives to the bottom side.
  3. Run routing feasibility again before autorouting.
dingusmingus

dingusmingus

the esp doesnt fit

flux

I’ll inspect the ESP32 module placement and board clearance, then move/orient it so the module body and antenna keepout fit within the enlarged round PCB/case constraints.

flux

Fixed the ESP32 fit issue: U1 was protruding past the 42 mm circular board, so I moved it inward. It is now fully inside the PCB outline at approximately (0, 5 mm).
Open items:
  • Moving U1 inward created new routing congestion between U1, U5, J1, and J3.
  • The next placement pass should spread the motor driver/AMOLED connector area and possibly move small passives to the bottom side.
Suggested next steps:
  1. Re-place the crowded U1/U5/J1/J3 cluster.
  2. Move selected passives to the bottom layer.
  3. Run routing feasibility again.
Re-place and check
Re-place crowded cluster
Move passives bottom
Run layout review
Protect antenna keepout
U1
U1 IO4 - J1 8
U2 SYS - U3 IN
U1 IO13 - U5 AIN1
U1 IO15 - U5 BIN1
U3 SW2 - L1 P2
U3 SW1 - L1 P1
U1 IO9 - U4 SDA
U1 IO15 - U5 BIN1
U1 IO8 - J1 19
TP1 TP - U2 IN
U3 OUT - U1 3V3
U1 IO1 - J1 14
U1 IO9 - U4 SDA
U1 IO3 - J1 10
U3 OUT - U1 3V3
U1 IO21 - Q1 G
J1 12 - U1 IO2
U1 IO17 - U5 nSleep
U4 VBAT - U5 VINT
U1 RXD0 - TP4 TP
U1 IO6 - J1 6
U1 IO11 - U2 INT
U1 IO10 - U4 SCL
U1 IO19 - J1 7
U1 IO13 - U5 AIN1
U1 IO11 - U2 INT
U1 IO5 - J1 4
U3 IN - C5 P1
U3 IN - C5 P1
U1 IO16 - U5 BIN2
U1 IO14 - U5 AIN2
U1 IO16 - U5 BIN2
U3 AGND - U4 VSS
U1 GND - U1 GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U1 GND - U1 GND
U3 AGND - U4 VSS
GND
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
GND
U1 GND - U1 GND
U1 GND - U1 GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U3
U2
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007-Inspired Hybrid ESP32 Smartwatch thumbnail
A 44 mm 007 First Light-inspired hybrid smartwatch concept using an ESP32-class 2.4 GHz Wi-Fi/BLE module, round AMOLED/OLED display, mechanical real-time hands, rechargeable battery, sealed charging, and a red strap-mounted laser feature.

Properties

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