Schematic Design Analysis

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1:29

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

IssueRecommendation
Generic nets “Net X”Rename to VBUS, VIN, V3V3, CC1, CC2
Incomplete ESP32 decouplingAdd 0.1 µF cap per ESP32 power pin (VDD_SDIO, VDDA, etc.)
No EN pull-upAdd 100 kΩ from EN to V3V3
CC pull-downs unclearEnsure R1/R2 P2 pins are wired to GND with clear net-ports
LDO cap valuesVerify at least one ≥1 µF low-ESR cap on U2 VIN and one on U2 VOUT
Ground topologyImplement star/hybrid star ground tie-points around decoupling and LDO
Redundant net portalsConsolidate 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
344 days
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U1 GND - U2 GND
U1 GND - U2 GND
J1 VBUS - F1 P1
U2 VO - U1 3.3V
J1 VBUS - F1 P1
F1 P2 - U2 VI
F1 P2 - U2 VI
U2 VO - U1 3.3V
R2
Resistance
500 Ω
F1 P2 - U2 VI
C1
Capacitance
Capacitance
J1 CC2 - R2 P1
C2 P1 - C4 P1
C2 P1 - C4 P1
J1 CC1 - R1 P1
C2
Capacitance
Capacitance
C3
Capacitance
Capacitance
U1 GND - U2 GND
C4
Capacitance
Capacitance
R1
Resistance
500 Ω
U2
J1
F1
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • 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
  • Power Net Portal
    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
    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
  • 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 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
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

ESP32 Water meter

ESP32 Water meter thumbnail
ESP32 Water Meter is a board designed to accurately measure water usage using an ESP32 microcontroller. It integrates built-in Wi-Fi, Bluetooth, and BLE for seamless data transmission and remote monitoring. The design incorporates essential components such as a linear voltage regulator, USB-C connector for power and programming, fuse, and TVS diode for circuit protection. This robust solution offers reliable power management and sensor integration, making it ideal for IoT applications in water metering and resource monitoring.
#ESP32WaterMeter #IoT #WaterMeter #ESP32 #DataTransmission #PowerManagement #ElectronicsDesign #PCBDesign

Properties

Properties describe core aspects of the project.

Pricing & Availability

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

Controls