Isolated ISE Probe Interface

Use any Ion Specific Electrode, pH, ORP, or mV Probe

What it is

An I2C sensor device that can read any voltage based sensor such as a pH or ORP probe. There are pin headers available to connect a waterproof DS18B20 temperature sensor for temperature compensation. The firmware on the device provides two calibration options, single or dual point which can be used simultaneously.

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 from the controlling device can help to prevent it.

All μFire probe interfaces come with electrical isolation hardware which provides a stable, isolated power supply and I2C bus between the interface 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. - $50.00

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

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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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