pH Click Board™

Product Code: MIKROE-4297

How Does The pH Click Board™ Work? The pH Click Board™ is based on the pH EZO™, a 6th generation embedded pH circuit that offers the highest level of stability and accuracy from AtlasScientific. With an easy to use UART data protocol (with additional I2C serial interface), simple command structure and flexible calibration protocol that supports single-point, two-point, or three-point calibration, this Click board™ works well with any off-the-shelf pH probe. It has temperature-dependent or independent readings with a full range of pH readings from 0.001 to 14.000. Additional thorough and pictorial explanations of any of the calibration methods can be found in the attached datasheet. The pH EZO™ circuit is characterized by great sensitivity that gives its accuracy. When electrical noise is interfering with the pH readings, it is common to see rapidly fluctuating readings or readings that are consistently off. To verify that electrical noise is causing inaccurate readings, place the pH probe in a cup of water by itself.

The pH readings should stabilize quickly, confirming that electrical noise was the issue. The pH Click Board™ uses the UART communication interface as its default communication protocol that supports all standard baud rates up to 115.200 but also provides the possibility of using the I2C serial interface. The selection can be performed by positioning SMD jumpers labelled as COMM SEL to an appropriate position. Note that all jumpers must be placed to the same side, or else the Click board™ may become unresponsive. The pH Click Board™ uses the UART communication interface as its default communication protocol that supports all standard baud rates up to 115.200 but also provides the possibility of using the I2C serial interface. The selection can be performed by positioning SMD jumpers labelled as COMM SEL to an appropriate position. Note that all jumpers must be placed to the same side, or else the Click board™ may become unresponsive. Also, the pH EZO™ circuit contains an LED indicator that informs the user about the current state of the pH circuit at any time with a specified color. The green color indicates Standby Mode, the yellow color indicates sent pH data, while the blue color indicates pH data being read. Besides, there is a purple color that signals a change in the Baud rate, a red color that represents an invalid command given by the user, and a white color that the LED flashes when a device is connected to the circuit. The pH Click Board™ is designed to operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. It allows for both 3.3V and 5V capable MCUs to use the UART communication lines properly. However, the Click board™ comes equipped with a library that contains easy to use functions and an example code which can be used, as a reference, for further development. SPECIFICATIONS Type Enviromental Applications Can be used for applications where users want to add high accuracy pH readings to their future projects. On-board modules The pH Click Board™ is based on the pH EZO™, a 6th generation embedded pH circuit that offers the highest level of stability and accuracy from AtlasScientific. Key Features High stability and accuracy, easy to use data protocol, simple command structure, flexible calibration protocol, works with any off-the-shelf pH probe, and more. Interface I2C,UART Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of the pH Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 NC NC 2 RST INT 15 NC NC 3 CS RX 14 TX UART TX NC 4 SCK TX 13 RX UART RX NC 5 MISO SCL 12 SCL I2C Clock NC 6 MOSI SDA 11 SDA I2C Data Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply