Schematic Design Review
just remove the esp32 from the circuit and instead use a pin header.
Thought for 6 sec
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.
Worked for 3 mins 39 sec
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
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Explain header wiring
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Concise BOM - Part Name, Value, Designators
Date: 2026-07-11
Project: ESP32-C3 ADS1115 pH ORP Sensor Interface 4412
This BOM reflects the current schematic after replacing the ESP32-C3 module with external-controller header
J2. Net portals, grounds, and no-connect markers are excluded. R7 and R8 are optional/DNP I2C pull-ups and are listed separately because they are marked Exclude from BOM: true in the schematic.Assembly BOM
Table
| Part Name | Value | Designators |
|---|---|---|
| Generic Capacitor | 100 nF | C1, C2, C6, C8, C9, C10, C11, C12, C14, C15, C16 |
| Generic Capacitor | 100 pF | C7, C13 |
| Generic Capacitor | 1 uF | C4 |
| Generic Capacitor | 10 uF | C3, C5 |
| Generic Resistor | 1 kOhm | R4, R5, R6, R9, R10, R13 |
| Generic Resistor | 4.7 kOhm | R11 |
| Generic Resistor | 10 kOhm | R14 |
| Generic Resistor | 100 kOhm | R1, R2 |
| Generic Resistor | 1 MOhm | R3, R12 |
| CONBNC001 BNC Connector | CONBNC001 | J1, J5 |
| Pin Header 01x08 2.54 mm Vertical | External controller header | J2 |
| Pin Header 01x03 2.54 mm Vertical | 3-pin header | J3 |
| Pin Header 01x02 2.54 mm Vertical | 2-pin header | J4 |
| Pin Header 01x04 2.54 mm Vertical | 4-pin header | J6 |
| ADS1115 Module | ADS111X / ADS1115 module | U1 |
| MCP6002-I/P | Dual op amp, DIP-8 | U2, U3 |
| 1101M2S3CQE2 | SPDT slide switch | SW1 |
Optional / DNP Parts
Table
| Part Name | Value | Designators | Note |
|---|---|---|---|
| Generic Resistor | 10 kOhm | R7, R8 | Optional/DNP SDA/SCL pull-ups; excluded from BOM because the ADS1115 module may already include onboard 10 kOhm pull-ups. Populate only if the final ADS1115 module does not provide I2C pull-ups. |
Header J2 Pinout
Table
| J2 Pin | Net | Function |
|---|---|---|
| 1 | 3V3 | External regulated 3.3 V rail / board power rail |
| 2 | GND | Ground |
| 3 | SDA | ADS1115 I2C SDA |
| 4 | SCL | ADS1115 I2C SCL |
| 5 | ALT | ADS1115 ALERT/RDY, optional |
| 6 | ADR | ADS1115 ADDR control, also pulled down by R14 |
| 7 | DQ | DS18B20 1-Wire data |
| 8 | GND | Ground |
Quantity Check
- Assembly capacitors: 16 total
- Assembly resistors: 12 total
- Optional/DNP resistors: 2 total
- Connectors/modules/switches/ICs: J1, J2, J3, J4, J5, J6, U1, U2, U3, SW1
Assembly BOM
Optional / DNP Parts
Header J2 Pinout
Quantity Check
