Solar Bee Monitor Schematic

Worked for 27 mins 24 sec

Focused recovery status: Regulator recovered; routing blocked by auto-route job state Completed

Confirmed the original TPS56528DDA footprint was malformed, not a valid segmented PowerPAD:
- TI specifies one exposed GND PowerPAD.
- Flux footprint contained two coincident, unnetted mount pads plus a separate undersized GND pad.
- Project-local overrides could not disable the nested duplicate pads.
Filed an internal part-quality report for the TPS56528DDA Flux library part.
Replaced U_5V with verified Texas Instruments TPS56637RPAR:
- 4.5–28 V input
- 5 V adjustable output
- 6 A continuous rating
- 10-pin 3 × 3 mm VQFN-HR package
Completed inspect → replace → rewire → verify → re-place workflow.
Updated the support network to TI’s 5 V recommendations:
- L_5V: 3.3 µH, reference-class 10.5 A peak / 9.7 A RMS
- Input: 2 × 22 µF plus 100 nF VIN–PGND
- Output: 2 × 22 µF
- Bootstrap: 100 nF BOOT–SW
- Feedback: 73.2 kΩ / 10.0 kΩ
- PG pull-up: 100 kΩ
- MODE tied to GND for Eco-mode
- AGND and PGND connected to GND
- NC explicitly marked no-connect
Fresh ERC returned zero concrete errors.
Re-placed only the local 5 V stage and made one small J_BAT shift to clear a mounting hole.
Updated Project Specification, Bring-Up Plan, Safety Analysis and FMEA.

Final project state

Table

Item	Result
Final regulator	TPS56637RPAR
Regulator action	Replaced, not overridden
Components	75
Nets	47
Placed components	75 / 75
Board	100 × 100 mm, 2 mm corners
Stackup	Standard 4-layer
Component fill	16.6%
NodeMCU row spacing	25.4 mm exact
Header positions	X = −12.7 mm and +12.7 mm; Y = 20 mm
Header orientation	Parallel, 0°, matching pin-1 direction
Airwires	124
Routed completion	Not completed

Pre-route assessment

The replacement footprint’s four overlapping VIN copper terminals are an intentional HotRod-QFN construction. They are all on BAT_PROTECTED_IF; the checker states they will be treated as one pin. This is not the original malformed thermal-pad defect.

No fresh errors were reported for:

Missing footprints
Component body overlap
Components outside board
Invalid layers
Overlapping copper
Dangling traces

Routing blocker

A new auto-route job was started, but the Flux job remained cycling through generating, stopped, resuming, and restarted states without persisting routes. The job could not be cleanly completed or restarted within this pass. I did not force routing or manually attempt 124 connections.

Fresh DRC counts

Errors: 124
- Airwires: 124
Warnings: 1
- Component override on U_5V:VIN_1; this originates from the replacement library footprint’s HotRod-QFN copper construction.
Other requested manufacturing-critical categories: no findings returned.

Antenna and mechanical status

NodeMCU header geometry remains exact and unchanged.
USB and antenna ends remain identified.
The antenna keepout marking/zone remains present, but all-layer copper exclusion cannot be conclusively verified until routing and pours complete.
Four 3.2 mm NPTH mounting holes remain present.
Connector edge placement and safety markings were preserved.

Manufacturing readiness

Not manufacturing-ready.

The regulator defect is resolved and the schematic is electrically restored, but the board still has 124 airwires because the auto-route service did not complete. Power pours, GND stitching, all-layer antenna exclusion, current-density verification and final silkscreen/copper review therefore remain blocked.

elite2279

please do it fast asap

Thought for 9 sec

flux

The 100 × 100 mm, 4-layer PCB is fully placed with 75 components, four mounting holes, exact 25.4 mm NodeMCU header spacing, connector labels, and antenna keepout. The defective TPS56528 footprint was reported and replaced with a verified TPS56637RPAR 6 A buck; ERC is clean.

Blocked: the routing service failed to persist routes, leaving 124 airwires, so the PCB is not manufacturing-ready. Routing, power pours, antenna copper-exclusion verification, and final DRC must be retried after the routing service recovers.

Retry routing later

Explain blocker

Review placement

Check manufacturability

Export docs only

Files

Schematic

Layout

Preview

U_5V

J_BAT

J_INMP441

D_RS485

L_5V

Inductance

3.3uH

CRS485

Capacitance

100nF

Capacitance

22uF

C5VIN1

Capacitance

22uF

CCAM_OUT

Capacitance

100uF

C_BAT_ADC

Capacitance

100nF

CGATE_IN

Capacitance

10uF

C3OUT

Capacitance

10uF

C_SOL_ADC

Capacitance

100nF

L_3V3

Inductance

2.2uH

C5OUT1

Capacitance

22uF

CCAM_IN

Capacitance

10uF

Capacitance

22uF

CMUX

Capacitance

100nF

C5REG

Capacitance

100nF

CGATE_OUT

Capacitance

100uF

C5BST

Capacitance

100nF

C3VIN

Capacitance

10uF

J_SOLAR

J_MCU_R

TP_NTC

R_I2C_SDA

Resistance

4.7kΩ

R5FBB

Resistance

10kΩ

Resistance

4.7kΩ

R_BAT_SER

Resistance

1kΩ

TP_5V

Resistance

4.7kΩ

R_SOL_SER

Resistance

1kΩ

TP6

R_SOL_BOT

Resistance

27kΩ

R_DE_PD

Resistance

100kΩ

TP7

R_TERM

Resistance

120Ω

R_BAT_TOP

Resistance

100kΩ

TP4

RCAM_EN_PD

Resistance

100kΩ

R3FBT

Resistance

450kΩ

R3EN

Resistance

100kΩ

TP8

R_ADXL_CS

Resistance

10kΩ

Resistance

4.7kΩ

TP3

TP1

R_BAT_BOT

Resistance

39kΩ

Resistance

4.7kΩ

Resistance

4.7kΩ

TP5

R_MUX_RST

Resistance

10kΩ

RGATE_EN_PD

Resistance

100kΩ

R5EN

Resistance

100kΩ

TP2

R3FBB

Resistance

100kΩ

R_SOL_TOP

Resistance

200kΩ

R5FBT

Resistance

73.2kΩ

J_MCU_L

R5PG

Resistance

100kΩ

TP_B1

J_ADXL345

J_GATE

J_HX711

JP_TERM

U_RS485

J_SHT31

J_MPU6050

U_CAM_SW

J_OPT3001

J_CAM

J_SCD40

U_MUX

U_GATE_SW

U_3V3

Power Budget Analysis — Preliminary (before final sizing)

Basis

This is the mandatory pre-selection budget. Values are conservative engineering allocations compiled from common module datasheet maxima where available and deliberately padded where breakout-board variants are unknown. Exact purchased breakout measurements remain a bring-up requirement.

5 V Loads

Table

Load	Typical	Peak allocation	Notes
NodeMCU-32 dev board at VIN/5V	0.40 A	0.80 A	Wi-Fi TX burst plus onboard regulator/USB-UART overhead
ESP32-CAM	0.25 A	0.70 A	camera + Wi-Fi burst; separately switched
Bee-gate electronics	0.20 A	0.75 A	remote allocation; separately switched
Future IR system	0 A	1.00 A	explicit future allowance
Margin/connector transients	—	0.25 A	design reserve
5 V subtotal	0.85 A	3.50 A	4.25 W typical / 17.5 W peak

3.3 V Loads

Table

Load	Typical	Peak allocation	Notes
SCD40 breakout	18 mA	205 mA	measurement pulse allocation
SHT31-D breakout	1 mA	3 mA	heater not normally enabled
ADXL345	0.15 mA	1 mA	SPI
MPU-6050 breakout	4 mA	10 mA	includes breakout allowance
HX711 breakout	2 mA	10 mA	bridge excitation excluded unless supplied here; allocation includes small bridge
INMP441	1.4 mA	3 mA	I2S microphone
OPT3001 breakout	0.01 mA	1 mA	conversion and breakout allowance
I2C mux + RS-485 logic + LEDs	8 mA	60 mA	transmit/status worst case
Rail margin	—	107 mA	unknown breakout pull-ups/regulators
3.3 V subtotal	~35 mA	0.40 A	0.12 W typical / 1.32 W peak

Converter Reflection to 2S Battery at 6.0 V

Assume 5 V buck efficiency 90% at peak and 3.3 V regulator efficiency 88%.

5 V peak input current = 5.0 V × 3.50 A / (6.0 V × 0.90) = 3.24 A.
3.3 V peak input current = 3.3 V × 0.40 A / (6.0 V × 0.88) = 0.25 A.
Controls/protection/quiescent allocation = 0.06 A.
Combined protected-battery peak = 3.55 A.
Apply 25% engineering margin = 4.44 A design current.

Resulting Sizing Targets

Implemented 5 V converter is TPS56528DDA, 5 A class, serving the documented 3.5 A peak allocation. L_5V is specified 1.5 uH, Isat >=7 A, Irms >=6 A. Camera and gate TPS2034 switches are each 2 A recommended continuous / about 3 A typical limit and exceed their 0.70/0.75 A allocations.
Implemented 3.3 V converter is TLV62568DBV, rated 1 A; the 0.40 A rail peak retains margin.
5 V buck: not merely 3 A; select >=4 A continuous, preferably 5–6 A switch/current-limit class, with inductor saturation above calculated peak ripple current.
3.3 V rail: >=1 A rated regulator to accommodate breakout uncertainty and transient margin.
Battery connector/protection MOSFETs/sense path: >=5 A continuous design target, short-circuit trip coordinated above normal 4.44 A peak.
Gate and camera switches: >=1.5 A each; low RDS(on); default OFF.
Solar connector/fuse/reverse path: panel Isc assumption =2.5 A continuous, fuse near 2–2.5 A subject to panel label, and all exposed input semiconductors/capacitors rated with margin above 24 V (prefer 30–36 V TVS standoff strategy and 35–50 V components as appropriate).
Charger: 1.2 A nominal charge; input power about 11 W plus losses, within 30 W panel capability. Charger input-current and thermal limits must be checked at low irradiance and high temperature.

Runtime Envelope

Nominal pack energy 7.4 V × 3.0 Ah = 22.2 Wh. Ignoring reserve/aging, typical listed load ~4.4 W gives ~5 h. Real duty-cycled sensing may be much lower; simultaneous Wi-Fi/camera/gate/IR peak is transient and would yield ~1 h equivalent. Apply 80% usable-energy allowance for protection cutoff, cold, aging, and conversion loss.

Charger/System Operation Assumptions

No guaranteed seamless power-path/load sharing is assumed unless the selected charger reference design explicitly provides it. System load during charge can reduce termination accuracy. Firmware should inhibit camera/gate/IR during weak solar conditions unless validated.

Sources, Assumptions, and Limitations

Final values must be updated with exact selected part datasheets and purchased breakout documentation.
NodeMCU and ESP32-CAM current depends strongly on module variant, RF duty cycle, flash/PSRAM, camera, and onboard regulator.
Gate and future IR are allocations, not characterized loads.
HX711 bridge excitation topology is breakout-dependent.
Solar panel Isc and surge environment must be confirmed from the actual panel and cable installation.
This budget drives schematic sizing but is not a thermal or safety certification.

Basis
5 V Loads
3.3 V Loads
Converter Reflection to 2S Battery at 6.0 V
Resulting Sizing Targets
Runtime Envelope
Charger/System Operation Assumptions
Sources, Assumptions, and Limitations