SmartDeskPet v1.0 Shield
Stage 1 status:
- Goal: 5V input -> dual AMS1117-3.3 rails (+3V3_MCU and +3V3_WIFI) with common GND.
- Note: Keep power nets explicitly named (avoid unnamed nets) to keep ERC happy.
Stage 1 completion checklist:
- Mark J1 Pin_1 (+5V) as a Power Output pin to satisfy ERC power-driver checks.
- Verify all GND symbols/returns are on the same GND net.
- Keep +5V_SERVO isolated from the main +5V net (only share GND).
Stage 2 preparation notes (MPN/LCSC + layout constraints):
- MPN/LCSC targets to define before Stage 2 exit:
- AMS1117-3.3 (SOT-223): set exact MPN and (optionally) LCSC PN for both U1 and U2.
- 100nF capacitor (0603): set MPN/LCSC for all 0603 100nF decouplers.
- 4.7k resistor (0603): set MPN/LCSC for I2C pull-ups R1 and R2.
- 1000uF bulk capacitor (radial): set MPN/LCSC for C7 (CP_Radial_D10.0mm_P5.00mm).
- DC005 power jack/regulator input: select exact DC005 footprint + MPN/LCSC (if used).
- 2.54mm headers/sockets: set MPN/LCSC for H1, H2, J1, J3, J4, J5, P3, P4, P5, and J2.
- ESP-01S antenna keepout:
- Reserve a copper keepout under and in front of the ESP-01S onboard antenna.
- No copper pours/traces/components in the antenna region (top and bottom) per module guidelines.
- H1/H2 header spacing:
- Maintain 1000 mil spacing between H1 and H2 header centerlines (shield mechanical requirement).
- Silkscreen placeholders:
- Add silkscreen labels for: 5V IN, GND, +3V3_MCU, +3V3_WIFI, SERVO1, SERVO2, I2C SDA/SCL, DHT11, ASRPRO UART2, ESP-01S UART3.
- Add placeholder text for: MPN, LCSC, board revision, and date code.
Stage 3 layout constraints (placement and routing guidance):
- Connector placement strategy:
- Place H1 and H2 first to lock the shield mechanical interface; enforce 1000 mil spacing.
- Place J1 and any DC005 input at the board edge for easy access.
- Designated power area planning:
- Group U1, U2, and C7 near the 5V entry point; keep high-current 5V and regulator loops short.
- Use wide copper for +5V and any servo supply; stitch GND around power section.
- Antenna keepout boundaries:
- Place J2 (ESP-01S socket) at a board edge with the antenna facing outward.
- Enforce a top-and-bottom copper keepout in the antenna region; keep noisy power traces away.
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