pH 측정 모듈 -MCP607
(PH 2 CLICK)
개요
- 본 제품은 pH 측정 모듈 -MCP607 입니다.
- low-bias current Op Amp MCP607칩 을 기반으로 디자인된 제품으로, hydrogen ion 활동을 측정하여 전기적인 포텐셜/전압을 만들어 냅니다.
- 3.3V/5V 시스템과 사용이 가능합니다.
특징
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HOW DOES IT WORK?
pH 2 Click is based on the MCP607, a low-bias current operational amplifier from Microchip. This Click board™ operation is based on measuring hydrogen ion activity and produces an electrical potential or voltage. An electric potential develops when two liquids of different pH come into contact at opposite sides of a pH electrode thin glass membrane. The pH electrode represents a passive sensor, which means no excitation source (voltage or current) is required. It is classified as a bipolar sensor because its output can swing above and below the reference point. This board is a perfect solution for a wide variety of pH-sensing applications, including water treatment, chemical processing, medical instrumentation, and environmental test systems.
pH 2 Click is used to detect the concentration of hydrogen ions in a solution and convert it into a corresponding usable output signal. Because the pH electrode produces a bipolar signal, the electrode signal is first level shifted by the MCP607, a low bias current Op Amp set up in a unity-gain configuration with configurable reference for its calibration. Second, due to the high impedance of the electrode, another Op Amp inside the MCP607 provides the required high-input impedance buffer. A buffered signal can be then converted to a digital value using the MCP3221, a successive approximation A/D converter with a 12-bit resolution from Microchip using a 2-wire I2C compatible interface, or can be sent directly to an analog pin of the mikroBUS™ socket labeled as AN. The selection can be performed using an onboard SMD switch labeled OUT SEL, placing it in an appropriate position marked as AN or ADC.
It is important to note that a pH electrode's sensitivity varies over temperature. For this reason, it is possible to add the DS18B20, 1-wire thermometer via the DQ terminal to the pH 2 Click, whose temperature can be monitored via the DQ pin on the mikroBUS™ socket. In addition, the user can digitally monitor different statuses in operation through the ST1 and ST2 pins on the mikroBUS™ socket or through visual detection on the STAT1 and STAT2 LEDs.
This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
Type Environmental Applications Can be used for measuring pH in various applications, including water treatment, chemical processing, medical instrumentation, and environmental test systems On-board modules MCP607 - low-bias current dual operational amplifier from Microchip Key Features High stability and accuracy, flexible calibration, works with any off-the-shelf pH probe, temperature compensation with additional thermometer, selectable analog or digital output, user-configurable LED indicators, and more Interface Analog,I2C Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V