Arduino pH sensor: Difference between revisions
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== Theory == | == Theory == | ||
An ideal pH sensor because H<sup>+</sup> ions. Ranging linearly: | |||
* U = 0 @ pH 7 | |||
* U > 0 @ pH < 7 | |||
* U < 0 @ pH > 7 | |||
A high quality op amp is needed to amplify the voltage. | |||
The pH electrode | |||
* a passive sensor | |||
== Calibration == | == Calibration == | ||
Revision as of 14:44, 3 March 2026
Introduction
3 major commercially available or mass-produced solutions:
- Atlas Scientific and Gravity analog pH Kit with board, sensor and buffer solutions. Hiqh quality, not open source.
- DFRobot Gravity: Analog pH Sensor Kit
- Other (Chinese) manufacturers.
- Seeed Studio
Theory
An ideal pH sensor because H+ ions. Ranging linearly:
- U = 0 @ pH 7
- U > 0 @ pH < 7
- U < 0 @ pH > 7
A high quality op amp is needed to amplify the voltage.
The pH electrode
- a passive sensor
Calibration
Code
References
https://www.e-tinkers.com/2019/11/measure-ph-with-a-low-cost-arduino-ph-sensor-board/
