Sensor hats

Both RootMaster and RootSense can have different type of sensing modules depending on what or how to measure the connected sensor or probe.

OpenHydroponics pH

This is our own in-house developed pH sensor module. If can work with either generic pH probes or probes from Atlas Scientific.

The pH sensor interface is using an ADS1115 ADC connected to the i2c bus. The input signal is an analog input ranging from -2.035 V to +2.035 V where -2.035 V is 14 pH, 0 V is 7 pH, and +2.035 V is 0 pH. To read this the ADC must be configured to read AIN0 and AIN1 as a differential input. The 7 bit i2c address is 0x49.

Temperature compensation and calibration must be implemented by the firmware using the module.

Atlas Scientific EZO™ PH

The Atlas Scientific EZO™ pH Circuit is a highly accurate and versatile pH sensor module and connected to the i2c bus. The EZO™ pH Circuit can work with any standard pH probe and provides readings in the range of 0 to 14 pH with an accuracy of ±0.002 pH.

The module features temperature compensation, which ensures accurate readings even when the temperature of the solution changes. It also has a flexible calibration system that allows for single-point, two-point, or three-point calibration.

The 7 bit i2c address is 0x63.