Getting Started with SEN0464: Setup & Guide

Measure ORP (Oxidation-Reduction Potential) values of a liquid using the Gravity Analog ORP Sensor PRO and output the results to the serial monitor. Users can learn how to connect the sensor to an Arduino, use the DFRobot_ORP_PRO library, and read analog signals to calculate ORP values.

Hardware Preparation

Name	Model/SKU	Quantity	Purchase Link
DFRduino UNO Controller	Product-838	1	DFRduino UNO Controller
Gravity Analog ORP Sensor PRO	SEN0464	1	Gravity Analog ORP Sensor PRO

Software Preparation

Development Tool: Arduino IDE (compatible with most versions)
Library: DFRobot_ORP_PRO Library (install via Arduino IDE Library Manager or ZIP import)

Wiring Diagram

SEN0464 接线图

Other Preparation Work

Connect modules according to the wiring diagram.
Ensure the Arduino is powered by a high-quality linear regulated power source or fully charged lithium battery (voltage close to 5V for best accuracy).
Do not immerse the ORP probe fully in liquid (not completely waterproof).
Upload the sample code to the Arduino before inserting the probe into the liquid.

Sample Code

#include "DFRobot_ORP_PRO.h"

#define PIN_ORP A1
#define ADC_RES 1024
#define V_REF 5000

float ADC_voltage;

DFRobot_ORP_PRO ORP(0);

void setup() {
  Serial.begin(115200);
}

void loop() {
  ADC_voltage = ((unsigned long)analogRead(PIN_ORP) * V_REF + ADC_RES / 2) / ADC_RES;
  Serial.print("ORP value is : ");
  Serial.print(ORP.getORP(ADC_voltage));
  Serial.println("mV");
  delay(1000);
}

Result

Serial monitor output (ORP measurement data):

ORP value is: 244 mV
ORP value is: 244 mV
ORP value is: 245 mV
ORP value is: 245 mV
ORP value is: 245 mV

Additional Information

Measurement Note:
- Simply insert the terminal electrode into the measured liquid and read the data. ORP probes are not completely waterproof—do not immerse the probe fully.
- Use a stable 5V power supply for the Arduino to minimize voltage fluctuations and improve accuracy.
- ORP electrodes do not require calibration for normal use. Use ORP standards only to verify probe/signal converter functionality if results are questionable.

Example Code for Arduino-ORP Measurement