Schematic Design Review


Created 2 project docs

Concise BOM - Part Name, Value, Designators

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Date: 2026-07-11 Project: ESP32-C3 ADS1115 pH ORP Sensor Interface 4412

Circuit and Documentation Reverification

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Date: 2026-07-11 Project: ESP32-C3 ADS1115 pH ORP Sensor Interface 4412
Done — I reverified the live schematic/netlist and documentation, and created the requested BOM.
Files created:
Summary: ERC-style schematic checks are clean, but the same real design issues remain: I2C on GPIO8/GPIO9, DNP I2C pull-ups, missing external ALRT/RDY pull-up, ambiguous ADS1115 module identity, and unclear external power-module intent. The older docs also still contain stale Arduino/5V/J2 references that should be updated before firmware handoff or manufacturing.
just remove the esp32 from the circuit and instead use a pin header.
I’ll replace the ESP32-C3 module interface with a simple pin header while preserving the existing signals for an external controller connection, then verify the schematic connectivity.
Done — I removed the ESP32-C3 module U4 and replaced it with J2, a 1x08 external-controller pin header.
J2 pinout:
  • Pin 1: 3V3
  • Pin 2: GND
  • Pin 3: SDA
  • Pin 4: SCL
  • Pin 5: ALT
  • Pin 6: ADR
  • Pin 7: DQ
  • Pin 8: GND
Verification passed: the new header nets are connected and ERC checks showed no open schematic issues. I also updated Concise BOM - Part Name, Value, Designators and Circuit and Documentation Reverification.
Fix issues and verify
Add ALRT pull-up
Make pull-ups populated
Update all documentation
Run full review
Explain header wiring

U1
C7 P2 - R6 P1
U2 VDD - R7 P1
J1 Signal - R3 P1
R14 P1 - U1 ADDR
R8 P2 - U1 SCL
J5 GND - R10 P1
J1 GND - C6 P1
R10 P2 - C14 P2
U1 A0 - C11 P1
U2 VINB+ - R2 P1
J5 GND - R10 P1
U4 GPIO4 - J4 P1
U2 VDD - R7 P1
SW1 2 - J6 Pin_3
J1 GND - C6 P1
U1 A2 - C14 P1
U2 VDD - R7 P1
U1 A1 - R6 P2
U4 GPIO4 - J4 P1
U4 GPIO10 - U1 ALRT
J5 GND - R10 P1
U2 VDD - R7 P1
U2 VINB+ - R2 P1
R14 P1 - U1 ADDR
U2 VDD - R7 P1
J5 GND - R10 P1
R12 P1 - J5 Signal
C13 P1 - R12 P2
J1 GND - C6 P1
U1 A0 - C11 P1
R14 P1 - U1 ADDR
U1 A2 - C14 P1
R4 P1 - U2 VINB-
R8 P2 - U1 SCL
U2 VINB+ - R2 P1
R4 P1 - U2 VINB-
U4 GPIO8 - R7 P2
C13 P1 - R12 P2
R10 P2 - C14 P2
SW1 2 - J6 Pin_3
U2 VDD - R7 P1
J1 Signal - R3 P1
USB5
C13 P1 - R12 P2
U1 A1 - R6 P2
C7 P2 - R6 P1
U1 A2 - C14 P1
U1 A0 - C11 P1
U3 VOUTB - R13 P1
R5 P1 - U2 VINA-
C7 P1 - U2 VINA+
U4 GPIO4 - J4 P1
U2 VDD - R7 P1
C7 P2 - R6 P1
U2 VDD - R7 P1
BAT
J1 GND - C6 P1
U4 GPIO8 - R7 P2
U3 VOUTA - R9 P1
U3 VOUTB - R13 P1
J5 GND - R10 P1
R10 P2 - C14 P2
U4 GPIO4 - J4 P1
C7 P1 - U2 VINA+
U2 VDD - R7 P1
U1 A2 - C14 P1
U2 VDD - R7 P1
U2 VDD - R7 P1
U1 A0 - C11 P1
U2 VDD - R7 P1
U2 VDD - R7 P1
U1 A1 - R6 P2
U4 GPIO10 - U1 ALRT
U2 VINB+ - R2 P1
R8 P2 - U1 SCL
C7 P1 - U2 VINA+
U1 A1 - R6 P2
U2 VINB+ - R2 P1
R12 P1 - J5 Signal
U3 VOUTA - R9 P1
R5 P1 - U2 VINA-
U4 GPIO8 - R7 P2
U2 VDD - R7 P1
R10 P2 - C14 P2
C4
Capacitance
1 µF
R12
Resistance
1000000 Ω
R3
Resistance
1000000 Ω
R11
Resistance
4700 Ω
C1
Capacitance
100 nF
C8
Capacitance
100 nF
R6
Resistance
1000 Ω
R5
Resistance
1000 Ω
R10
Resistance
1000 Ω
C2
Capacitance
100 nF
C10
Capacitance
100 nF
R9
Resistance
1000 Ω
C6
Capacitance
100 nF
R8
Resistance
10000 Ω
C11
Capacitance
100 nF
R14
Resistance
10000 Ω
C7
Capacitance
100 pF
C13
Capacitance
100 pF
R4
Resistance
1000 Ω
R13
Resistance
1000 Ω
R2
Resistance
100000 Ω
C16
Capacitance
100 nF
C14
Capacitance
100 nF
C12
Capacitance
100 nF
C9
Capacitance
100 nF
R1
Resistance
100000 Ω
C3
Capacitance
10 µF
C5
Capacitance
10 µF
C15
Capacitance
100 nF
R7
Resistance
10000 Ω
GND
GND
R14 P2 - J2 8
GND
J1
GND
GND
U3 VSS - C15 P2
GND
J3 Pin_3 - J4 P2
GND
C11 P2 - C12 P2
GND
J3
U3 VSS - C15 P2
GND
GND
C11 P2 - C12 P2
GND
U3 VSS - C15 P2
J5
J3 Pin_3 - J4 P2
GND
R14 P2 - J2 8
U2
J6
U3
J2
J4
SW1

ESP32-C3 ADS1115 pH ORP Sensor Interface 4412

ESP32-C3 ADS1115 pH ORP Sensor Interface 4412 thumbnail