Analogue pH meter from DFRobot

TME offers literally hundreds of sensors and other components designed to work with Arduino, as well as other platforms, including Raspberry Pi. Modules measuring various physical quantities allow constructing interesting, advanced electronic circuits - not only for hobbyists, but also for pupils, students and even (at the prototyping stage) professionals.

DF-SEN0161 – pH sensor by DFRobot is a very interesting product that we would like to introduce to you today. It belongs to the Gravity series and (like all products in this group) it has been described in detail by the manufacturer. The supplier's website includes instructions for connection, calibration, and use, as well as a sample Arduino program – in a word: all the information you need to implement the DF-SEN0161 module.

The product consists of three components: a cable, a PCB with a sensor, and an electrode. Determining the pH value is carried out by measuring the voltage on the electrode. The advantage of this solution is a linear measurement characteristic, which facilitates programming and calibration of the device.

The DF-SEN0161 sensor has a measuring range from 0 to 14, i.e., it measures from the pH value of highly concentrated hydrochloric acid (HCl hydrogen chloride) to the alkalinity of lye (sodium hydroxide NaOH). At the optimum temperature (25°C), the DFRobot module has an accuracy of ±0.1, while the pH value for groundwater ranges from 6 (weakly acidic) to 8.5 (weakly alkaline, more info).