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Wiring Up LuminOx O2 Sensor to Arduino

Fortunately wiring up the LuminOx O2 Sensor to an Arduino is super easy

In the code example below we will use pins 10 and 11 to communicate with the sensor. So you can wire it up as follows

sensor pin 1 -> 5V power
sensor pin 2 -> Ground
sensor pin 3 -> pin 10
sensor pin 4 -> pin 11

LuminOx Sensor and RedBoard

Arduino Code for LuminOx O2 Sensor

Should be able to just copy and past the code into the arduino editor and upload it.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX (O2 Pin 3), TX (O2 Pin 4)

void setup() {
  Serial.begin(9600);
  mySerial.begin(9600);
}

void loop() {
 if (mySerial.available())  {
    Serial.write(mySerial.read());
    }
}

Open up the serial console to view the sensor output

LuminOx O2 Sensor Output

https://github.com/SeeedDocument/Seeed-WiKi/blob/master/docs/Grove-Gas_Sensor-O2.md

The Seeed Studio O2 sensor is a nice Oxygen sensor. It works up to 25% Oxygen concentration and is easy to use in an Arduino project.
http://wiki.seeedstudio.com/Grove-Gas_Sensor-O2/

Wiring Up the O2 Sensor to Arduino

If you look on the back of the sensor there are only 3 wires used. VCC, GND, and a SIG. The NC pin is “Not Connected”

Wire the
GND -> Arduino ground
VCC -> Arduino 3.3V (Looks like it may also accept 5V)
SIG -> A5 (Analog 5)

Code to read O2 Sensor

Copy and paste the following code into the Arduino IDE

// Grove - Gas Sensor(O2) test code
// Note:
// 1. It need about about 5-10 minutes to preheat the sensor
// 2. modify VRefer if needed

const float VRefer = 3.3;       // voltage of adc reference

const int pinAdc   = A5;

void setup() 
{
    // put your setup code here, to run once:
    Serial.begin(9600);
    Serial.println("Grove - Gas Sensor Test Code...");
}

void loop() 
{
    // put your main code here, to run repeatedly:
    float Vout =0;
    Serial.print("Vout =");

    Vout = readO2Vout();
    Serial.print(Vout);
    Serial.print(" V, Concentration of O2 is ");
    Serial.println(readConcentration());
    delay(500);
}

float readO2Vout()
{
    long sum = 0;
    for(int i=0; i<32; i++)
    {
        sum += analogRead(pinAdc);
    }
    
    sum >>= 5;
    
    float MeasuredVout = sum * (VRefer / 1023.0);
    return MeasuredVout;
}

float readConcentration()
{
    // Vout samples are with reference to 3.3V
    float MeasuredVout = readO2Vout();
    
    //float Concentration = FmultiMap(MeasuredVout, VoutArray,O2ConArray, 6);
    //when its output voltage is 2.0V,
    float Concentration = MeasuredVout * 0.21 / 2.0;
    float Concentration_Percentage=Concentration*100;
    return Concentration_Percentage;
}

Upload and Launch the Serial Monitor
Tools -> Serial Monitor
or
Ctrl + Shift + M

Pin	Designation
1	Vs (+5V)
2	GND (0V)
3	3.3V UART* Sensor Transmit
4	3.3V UART* Sensor Receive
	* 5V tolerant

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Tag Archives: sensor

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Arduino Code for LuminOx O2 Sensor

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Wiring Up the O2 Sensor to Arduino

Code to read O2 Sensor