Schematic for ESP32 Water meter: ESP32 Water Meter is a board...

Schematic Design Analysis

1:29

General (prev)

Project

Here’s a focused, point‐by‐point review of your “ESP32 Water meter” schematic, organized by category. All observations are drawn directly from the current design.

1. Electrical & Logical Issues

Floating or single-ended nets
- Net “Net 6” only connects [J1 CC2 – R2 P1] and R2. However its other pin ([R2 P2]) is correctly tied to GND per the net list—double-check your net-ports so the CC2 pull-down resistor is explicitly shown going to GND.
- Similarly for R1 on CC1 (Net 5): ensure its P2 pin is visibly wired to GND.
Default net names
- Nets “Net 1”–“Net 6” are ambiguous. Rename to meaningful names:
  - Net 1 → VBUS
  - Net 2 → VIN (LDO input)
  - Net 3 → V3V3
  - Net 5 → CC1
  - Net 6 → CC2

2. Component-Level Review

Decoupling capacitors around the ESP32
- You have three caps (C1, C2, C4) on V3V3 and one (C3) on VIN.
- Issue: The ESP32 module has multiple internal rails (VDD_SDIO, VDD_SPI, VDDA, etc.). At minimum add one 0.1 µF ceramic decoupler per each distinct ESP32 power pin, located as close to the pin as possible.
Pull-ups / Pull-downs
- No pull-up on EN (enable/reset) pin of U1.
  - Action: Add a ~100 kΩ pull-up resistor from EN to V3V3.
- No pull-up on GPIO0 (boot mode) or other strapping pins—these should be set to their required default levels.
Current-limiting resistors
- No LEDs are present, so none are required here. If you add status indicators later, remember a series resistor (~220 Ω–1 kΩ) per LED.
Missing protection
- You have a TVS TVS1 on VBUS—good for ESD.
- Consider: A reverse-battery protection diode or MOSFET on VIN to protect against accidental polarity reversal.

3. Power & Signal Integrity

LDO stability
- U2 requires a minimum 1 µF ceramic cap on both VIN and VOUT. You have C3 on VIN and C1/C2/C4 on VOUT—ensure at least one is ≥1 µF (and low-ESR), with its second pin right at GND.
Grounding topology
- All ground pins tie into a single GND net, but consider a star or hybrid star around the LDO and ESP32 decaps to minimize ground-bounce.
USB-C CC lines
- R1 and R2 must be the correct Rd pull-down values (≈5.1 kΩ) to advertise as a sink. Verify you’ve specified the right E-series value.

4. Schematic Best Practices

Net labeling consistency
- Switch from generic “Net X” to functional names (VBUS, VIN, V3V3, GND, CC1, CC2).
Annotation & clarity
- Add a net-tie symbol or junction to show where all GND portals converge.
- Group decoupling caps and their net names in a single neat block close to each IC.
Signal flow
- Arrange power section (USB → fuse F1 → TVS → LDO → decaps) from left to right or top to bottom to visualize flow.
Remove duplicate net-port symbols
- There are multiple “U1 GND – U2 GND” portals; consolidate to reduce clutter.

5. Actionable Corrections

Issue	Recommendation
Generic nets “Net X”	Rename to VBUS, VIN, V3V3, CC1, CC2
Incomplete ESP32 decoupling	Add 0.1 µF cap per ESP32 power pin (VDD_SDIO, VDDA, etc.)
No EN pull-up	Add 100 kΩ from EN to V3V3
CC pull-downs unclear	Ensure R1/R2 P2 pins are wired to GND with clear net-ports
LDO cap values	Verify at least one ≥1 µF low-ESR cap on U2 VIN and one on U2 VOUT
Ground topology	Implement star/hybrid star ground tie-points around decoupling and LDO
Redundant net portals	Consolidate duplicate ground and V3V3 portals to improve readability

Addressing these will resolve floating nets, strengthen power integrity, and bring your schematic in line with best practices. Let me know if you’d like guidance on any of these updates!

Rename nets

Add EN pull-up

Decoupling review

Ground topology advice

252 days

Ready.

U1 GND - U2 GND

J1 VBUS - F1 P1

U2 VO - U1 3.3V

J1 VBUS - F1 P1

F1 P2 - U2 VI

U2 VO - U1 3.3V

Resistance

500 Ω

F1 P2 - U2 VI

Capacitance

J1 CC2 - R2 P1

C2 P1 - C4 P1

J1 CC1 - R1 P1

Capacitance

U1 GND - U2 GND

Capacitance

Resistance

500 Ω

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper

Reports copper elements that are shorting.

Invalid Layer

Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.

Component Overrides

Reports components that have been modified using the "!important" flag.

Airwires • 5

	Designators	Net
	J1:GND, J1:GND	GND
	J1:GND, J1:GND	GND
	U2:GND, TVS1:GND	GND
	Via-Island-0:Via-Island-0, J1:GND	GND
	J1:VBUS, Trace 48c0:Trace 48c0	Net 1

Deprecated Rules

Reports nodes that are using rules that are not supported anymore.

Layers with Multiple Fills

Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.

Floating Copper

Detect any via, trace or copper fill island that is not connected to any net.

Protected Intrusions

Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.

Manufacturing

Manufacturer Part Number • 7

	Designator	MPN
	C1	None
	C2	None
	C3	None
	C4	None
	F1	None
	R1	None
	R2	None

Parts Available

Beta

Checks that all parts have a part number and are available from distributors.

System Checks

Auto-Layout

Beta

	Object	Issue	...
	VBUS	Unroutable
	GND	Unroutable

Passive Components

Resistor Power Rating

Beta

Checks that the power traveling across a given resistor is under its rating with 50% headroom.

Learn more

Pull Up/Pull Down Presence

Beta

Checks that IC pins that require pull up or pull down resistors have them.

Learn more

Capacitor Voltage Rating

Beta

Checks that capacitors have appropriate voltage ratings to prevent overheating and ensure reliable circuit operation.

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
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
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
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 10,000uF 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 20pF 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 Inductor
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
jharwinbarrozo
15.1k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

Inspect

ESP32 Water meter

Controls

Properties

Availability & Pricing

Distributor		Qty 1
	Arrow	$0.40–$0.46
	Digi-Key	$1.48–$2.17
	LCSC	$1.76–$2.23
	Mouser	$1.79
	Verical	$0.46–$0.89

Assets

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