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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.

Source Code/Calibration Code/Schematics Link: https://how2electronics.com/dissolved...
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