Analog Dissolved Oxygen Sensor Tutorial | DIY Arduino D.O. Meter

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In this project, we will learn how to make our own Dissolved Oxygen Meter using DfRobot Analog Dissolved Oxygen Sensor & Arduino. Dissolved oxygen refers to the extent of free, non-compound oxygen present in water or other liquids. it’s one of the foremost important parameters when assessing water quality due to its influence on the organisms living within a body of water. A DO level that’s too high or too low can harm aquatic life and affect water quality.

Since measuring the parameter of water quality is a complex task, so measuring the dissolved oxygen in water is also not an easy task. That is why the Dissolved Oxygen Meter (DO Meter) available in the market is very expensive. That is why it is important to make your own Dissolved Oxygen Meter. So the Gravity Analog Dissolved Oxygen Sensor from DfRobot is one of the most popular and best Dissolved Oxygen Sensors that are available in the market. The Analog dissolved oxygen sensor kit from DfRobot is compatible with Arduino, ESP8266, ESP32, STM32 microcontrollers & Raspberry Pie. The product is used to measure the dissolved oxygen in water, to reflect the water quality. It is widely applied in many water quality applications, such as aquaculture, environment monitoring, natural science, etc.

In this project, we will interface Gravity Analog Dissolved Oxygen Sensor with Arduino Board and 0.96″ OLED Display. We will first prepare the DO Sensor by filling the 0.5N Sodium Hydroxide Solution. Then we will prepare the sensor for testing. Once the sensor is prepared, we will go through the Arduino Dissolved Oxygen Sensor calibration code & we will calibrate the sensor. And then finally we will make our own Dissolved Oxygen Meter & display the dissolved Oxygen value in OLED Display.

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[InnovateYourselfashu]

Thank you so much for the video. I was eagerly waiting for this video. I'm happy that you made a video on this topic. Thanks a ton. <3

[nataliegurganus]

My voltage is reading zero no matter what I do. Does this mean I need to replace the 0.5 mol/L NaOH filling solution? Or am I simply not handing the code correctly? Thanks!

[taufiqdimasr]

Hello, so i want to use this sensor and been following this tutorial but always ended up with the adc raw and voltage not stable. it value could go higher or lower by a lot of margin without any change of the liquid. pls help or recomend any solution, TIA!

[one_D]

Hi, thank you for the great video. Odd question here, does the electrode of the probe touch the membrane? I'm asking because I recently bought one.
Thanks in advance

[yogeshwargupta]

What's required current for the given DO sensor

[abdelrazekshamma]

what should i change in the code if im going to use esp32 with ads1115 the vreff will remain the same ?

[javiercamacho]

Hi, sorry, I have a problem with the megavolt output, these reach 1200 and the temperature stays at 21. Can you help me?

[satrionurcahyo]

I was create project for agricultural sistem 3 years ago using this sensor

[elsacresli]

Sorry I asked which was the first liquid mixed with water and naoh?

[jmn]

Is that 20g on 1L, it looks like a 100mL only.

[vicoyfuentes]

Hi, I have an existing project using Analog DO sensor. What is your coding if we intend to have 3 pcs of Analog DO sensor?

[sahatputraalanrayhutahaean]

if I combine it with the ds18b20 temperature sensor, where is the code changed?

[iqrasami]

Could you please provide a link to order sodium hydroxide flakes?

[javadmohammad]

How much is this sensor power consumption or current draw at 5V?

[ItsJayBirds]

I got raw ADC value of around 1000ish ranging form 1080-1500, is this normal?

[MeirzaArson]

I'm using the filling solution with 100ml with 2g sodium hydroxide and trying to calibrate but the value is too low, 3 - 4 mg/L. should I change the membrane cap? Thanks

[e-splash]

I am using ESP32 as a microcontroller does the Voltage Reference that I would put in my ESP32 code is also 5000 mv the same the VREF in Arduino?

[myraesplana]

Hi. I'd like to try the two point calibration but my question is, what am I gonna do with this line of code?

#define READ_TEMP (25)

[maelmtv]

For the calibration, do you use just normal water or it need pure water ?

[alexsandertrader]

Where can I find this sensor? here in Brazil is so difficult to find that