# ESP32-C3 ADS1115 pH ORP Sensor Interface 4412 ## Description 3.3 V-powered pH and ORP probe interface using an ADS1115 module, MCP6002 through-hole buffers, and DS18B20 temperature sensing. External ESP32 connection is through one 5-pin header carrying 3V3, GND, SDA, SCL, and DQ; ADS1115 ADDR is fixed locally and ALERT is unused. ## Project Details - **Owner:** suda0809 - **Created:** 7/12/2026 - **Last Updated:** 7/14/2026 - **Visibility:** Public - **Domain:** Sensor - **Operating Voltage:** 3.3V - **Software:** Arduino - **Connectivity:** I2C - **Power Requirements:** Battery - **Stars:** 1 ## Key Components ### J1 — [CONBNC001](https://www.flux.ai/vasy_skral/conbnc001~qj8.md) - Manufacturer Name: TE Connectivity Linx - Role: Sensing (Shunt) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: 5-pin through-hole BNC matching user's connector photo: center=PHE, four shield/mechanical pins=PHR biased near 1.65V, not GND. - Manufacturer Part Number: CONBNC001 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=CONBNC001&DocType=Data+Sheet&DocLang=English&DocFormat=pdf&PartCntxt=CONBNC001 **Pins:** - GND [pin S2] - GND [pin S3] - GND [pin S1] - GND [pin S4] - Signal [pin 1] ### J2 — [Pin Header 01x05 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x05-254mm-vertical~cas.md) - Role Details: Single external ESP32/power header: Pin1=3V3 input, Pin2=GND, Pin3=SDA, Pin4=SCL, Pin5=DQ for DS18B20 1-Wire data. - License: https://creativecommons.org/licenses/by/4.0/ - Connector Positions: 5 - Role: Interface - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### J3 — [Pin Header 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md) - Role: Sensing (Shunt) - Role Details: DS18B20 temperature probe header: Pin1=3V3, Pin2=DQ 1-Wire data, Pin3=GND. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Connector Positions: 3 **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J5 — [CONBNC001](https://www.flux.ai/vasy_skral/conbnc001~qj8.md) - Manufacturer Name: TE Connectivity Linx - Role: Sensing (Shunt) - Part Type: Connector - Manufacturer Part Number: CONBNC001 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=CONBNC001&DocType=Data+Sheet&DocLang=English&DocFormat=pdf&PartCntxt=CONBNC001 - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: 5-pin through-hole BNC matching user's connector photo: center=ORE, four shield/mechanical pins=ORR biased near 1.65V, not GND. **Pins:** - GND [pin S2] - GND [pin S3] - GND [pin S1] - GND [pin S4] - Signal [pin 1] ### U2 — [MCP6002-I/P](https://www.flux.ai/adrian95/mcp6002-ip~t3o.md) - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP6001-1R-1U-2-4-1-MHz-Low-Power-Op-Amp-DS20001733L.pdf - Manufacturer Part Number: MCP6002-I/P - Role: Amplification - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Operational Amplifier (OP-AMP) - Package or Case Code: DIP781W56P254L950H533Q8N - Role Details: Through-hole DIP-8 MCP6002 at 3V3: U2A buffers pH input, U2B buffers VBD into VBI for pH reference/bias. - Manufacturer Name: Microchip **Pins:** - VDD [pin 8] - VINA- [pin 2] - VINA+ [pin 3] - VINB- [pin 6] - VINB+ [pin 5] - VOUTA [pin 1] - VOUTB [pin 7] - VSS [pin 4] ### U3 — [MCP6002-I/P](https://www.flux.ai/adrian95/mcp6002-ip~t3o.md) - Package or Case Code: DIP781W56P254L950H533Q8N - Manufacturer Name: Microchip - Role Details: Through-hole DIP-8 MCP6002 at 3V3: U3A buffers ORP input, U3B buffers VBD into VBO for ORP reference/bias. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Operational Amplifier (OP-AMP) - Manufacturer Part Number: MCP6002-I/P - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP6001-1R-1U-2-4-1-MHz-Low-Power-Op-Amp-DS20001733L.pdf - Role: Amplification **Pins:** - VDD [pin 8] - VINA- [pin 2] - VINA+ [pin 3] - VINB- [pin 6] - VINB+ [pin 5] - VOUTA [pin 1] - VOUTB [pin 7] - VSS [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/suda0809/esp32-c3-ads1115-ph-orp-sensor-interface-4412~xe](https://www.flux.ai/suda0809/esp32-c3-ads1115-ph-orp-sensor-interface-4412~xe).* --- *Generated from [https://www.flux.ai/suda0809/esp32-c3-ads1115-ph-orp-sensor-interface-4412~xe](https://www.flux.ai/suda0809/esp32-c3-ads1115-ph-orp-sensor-interface-4412~xe)*