Zigbee pH Sensor

The Zigbee pH Sensor is a low-power wireless device designed for accurate pH measurement and operation with other ion-selective electrodes (ISE). It is based on the ultra-low-power nRF54L15 Zigbee SoC and consumes approximately 100 µA during normal operation, enabling long-term use from a single AAA battery. The analog front end is built around the LMP2231 precision operational amplifier, optimized for high-impedance electrochemical sensors. The sensor supports both pH electrodes and other ISE probes. Electrode connection is provided via an SMA connector. A BNC adapter is included to support a wide range of standard laboratory and industrial electrodes. For temperature compensation, the device supports an external 100 kΩ 3950 NTC temperature sensor.