pH ORP DS18B20 Circuit
Thought for 6 sec
Yes — a few sensors fit this board architecture well because you already have 3.3V, GND, I2C, 1-Wire, ADS1115 differential analog inputs, and high-impedance probe conditioning.
Good matching additions:
Table
| Sensor | Best Interface | Why it matches |
|---|---|---|
| EC / TDS / conductivity probe | Extra analog front-end + ADS1115 or separate IC | Common companion to pH/ORP for water quality. Needs AC excitation, so it is more complex than pH/ORP. |
| Dissolved Oxygen (DO) probe | Analog front-end + ADC | Useful for water quality. Probe type matters: galvanic/polarographic/optical. Analog DO needs careful conditioning. |
| Turbidity sensor | Analog or digital module | Easier add-on; can feed ESP32 ADC or ADS1115 if a channel is free. |
| Water temperature sensor, second DS18B20 | Same 1-Wire DQ bus | Very easy. Multiple DS18B20 sensors can share the same DQ line. |
| Water level / float switch | Digital GPIO | Simple safety/status input. Needs an extra J2 pin or separate connector. |
| Leak detector / wet contact sensor | Digital/analog GPIO | Useful for enclosure or tank monitoring. |
| Pressure sensor | I2C or analog | Useful if measuring pipe/tank pressure. Prefer I2C 3.3V sensors. |
| Flow sensor | Digital pulse GPIO | Useful for dosing/flow monitoring. Needs one ESP32 GPIO input. |
Best recommendation for your current project:
- EC/TDS sensor — most useful companion to pH + ORP, but requires new analog circuitry.
- Second DS18B20 — easiest; no schematic change needed except maybe documenting multiple sensors on the same DQ bus.
- Turbidity sensor header — practical and beginner-friendly if you use a module.
- Flow sensor or float switch header — useful, but J2 would need extra GPIO pins or a second connector.
I would not add all of them to this same board unless you expand the connector/header plan. For your current clean 5-pin ESP32 interface, the easiest “no major redesign” upgrade is multiple DS18B20 sensors on the same DQ line.
Compare sensor options
Add EC/TDS planning
Add turbidity header
Multiple DS18B20 guide
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