Isolated ISE Probe Interface

Measure pH or ORP

What it is

An I2C sensor device that can read any voltage based sensor such as a pH or ORP probe. The hardware is the same, the only difference between measuring pH and ORP is the API. There is a connector available to use a waterproof DS18B20 temperature sensor for temperature compensation. The firmware on the device provides two calibration options, single or dual point.

The board uses the Qwiic Connect System for wiring, it’s an easy-to-use, polarized, push-to-fit connector. No more mistaken connections or soldering header pins. Adafruit calls these connectors STEMMA QT.

All boards have a conformal coating to help protect against moisture, corrosion, and short circuits.

Why would I use this?

You would use this sensor device if you want to easily add pH or ORP measurements to your device.

Using it

There is extensive documentation on the specifications, setup, and use of the device.

The library to use it is in the Arduino and IDE. A python and rust implementation for Raspberry Pi is available. There is also a MicroPython library.





When different probes are connected to the same controlling device, they can cause interference. The environment also causes interference due to ground-loops or other electrical noise like pumps. Electrically isolating the probe can help to prevent these problems.

All μFire probe interfaces come with electrical isolation hardware which provides a stable, isolated power supply and I2C-bus between the sensor and your controlling device.

Buy it

The board can be purchased by itself, pH and ORP probes, and temperature sensors are also available separately.

Isolated ISE Probe Interface

The board by itself with one Qwiic wire. - $60.00

Waterproof Temperature Sensor

A DS18B20 temperature sensors enclosed in a waterproof housing. Measure from -55 to 125 C. It includes a convenient polarized connector and 1 meter of cable to easily attach it to uFire devices. - $7.00

pH Probe and Calibration Powder

The probe is gel-filled, single-junction, with a plastic body. Calibration powder in pH 4/7/10 that mixes with distilled water for a single use. - $20.00

ORP Probe

A gel-filled, 245 mV potential ORP probe with a platinum disc electrode. - $40.00

Qwiic Wires

Qwiic to Board - $1.50

Qwiic to Male - $1.50

Female to Qwiic - $1.50

Support and Questions

If you have questions, find a bug, or have any suggestions, go to this project’s GitHub page and submit an Issue or Pull Request. Or you can send an email to [email protected].

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