PHmeter – Arduino pH meter

PHmeter – Arduino pH meter

pH meters are scientific instruments used for measuring the activity and concentration of hydrogen-ions in water-based solutions, with the aim of indicating its acidity or alkalinity expressed as pH values. They find application in water & wastewater treatment, pharmaceuticals, chemicals & petrochemicals, food & beverages, mining, and agricultural processes to mention a few. For today’s tutorial, we will attempt to build an accurate, DIY version of this very useful tool.

pH meters comprises of majorly a probe and a processing unit which interprets the data from the probe and displays in a human readable format. pHmeter essentially measures the difference in electrical potential between a pH electrode and a reference electrode. As a result of this, pH meters are sometimes referred to as a “potentiometric pH meters”.

PHmeter – Arduino pH meter – [Link]

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Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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