This is ORP OXIDATION-REDUCTION POTENTIAL probe sensor, Oxidation is the loss of pf electrons and reductions and gain electrons. The probe are represented in millivolts can be positive or negative, the same like pH that measures hydrogen ION activity in a liquid solutions indicating its acidity/alkalinity for more detail please refer to this link, however compare to ORP Oxidation-reduction potential measures electrons activity in a liquid. The ORP data outputs represent how strongly electrons are transferred to or from substances in a liquid. Note: reading using ORP does indicate the amount of electrons available for allocations. This sensor is applicable for laboratory experiments and quality control.

Component Required

  • Arduino Microcontroller, TenssyDuino, ESP8266 12, 12E, ESP8266 NodeMCU, ESPDuino, ATMEGA328 16/12, ATMEGA32u4 16/8/ MHz, ESP8266, ATMEGA250 16 MHz, ATSAM3x8E, ATSAM21D, ATTINY85 16/8 MHz (Note: The Diagram below is using NANO. (please refer to the respective pin-outs)
  • ORP EZO Module (From AtlasScientfic)
  • pH/ORP Probe
  • pH/ORP BNC Connector (Optional)
  • Jumper Wire / DuPont Wire
  • Solder Less Breadboard

Wiring Guide

Source Code


  • Download ORP EZO Datasheet | PDF
Wiring the ORP Oxidation-reduction Potential Sensor with pH/ORP Probe on ESP / Arduino Microcontroller
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