PH Meter To Monitor Aquariums & Hydroponics Using Raspberry Pi, Arduino, ESP8266

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The HomeLab-pH is a circuit board intended for pH measurements.<br>The measured values are corrected for temperature changes by an included waterproof thermometer.<br>Here the board is sold in a set with the HomeLab-Isol digital isolator module. Using both in tandem gives stable and unbiased on-line pH measurements for aquaristics and hydroponics. More generally this set is applicable for all cases where pH-measurements are affected by electrical appliances immersed in the measured liquid. Another example is the progress monitoring of fermentation in beverage and wine production.<br>There are many cases where adding a digital isolator module does not benefit the measurements accuracy. For instance when samples are measured in a beaker, or measurements are made directly in a pool, or in volumes with no working electrical appliances, or when the HomeLab-pH module is battery operated. In these cases measuring with HomeLab-pH alone will suffice and give unaltered pH-values. To purchase HomeLab-pH module alone please visit:<br>https://www.ebay.com/itm/142423993924<br>If instead<br>only<br>the isolater module is needed visit:<br>https://www.ebay.com/itm/<br>142982309889<br>The HomeLab-pH module is just a measuring block. It has to be assisted by an external CPU-board and corresponding software to perform the calculations. Software packages for Raspberry Pi computer, Arduino controller and ESP8266 modules are freely available to download from the HomeLab-pH companion site at homelab.link. They give the user interface to log and visualize the measured values, as well as to calibrate the board.<br>When connected to Arduino or ESP8266 the module can be controlled by the user visually at the console. Alternatively both can act as a data server for HomeLab-pH, which can be accessed by a remote machine through a special communication protocol. The user may program additional functionality using the available HomeLab_pH library for Arduino IDE.<br>As an expansion board to Raspberry Pi viewing the readings or calibrating is as simple as pointing a smart-phone browser to the Pi's LAN address. The module can also be accessed at the RPi console or even with requests over http.<br>Features<br>Board<br>Accurate and stable voltage reading ensures a resolution of 0.01 pH over the 0 – 14 pH range.<br>Wide input voltage range suitable also for ORP measurements.<br>A digital temperature sensor to compensate pH for temperature impact (ATC).<br>Socket with Raspberry Pi compliant pinout.<br>A LED and a button for user interaction.<br>Supported by free software for Raspberry Pi, Arduino or ESP8266.<br>Each board is tuned and tested.<br>Software options for Arduino, ESP8266<br>A library for Arduino IDE.<br>Simple visual interface to read and calibrate the module.<br>Remote access by means of a special protocol (read and calibrate).<br>Software for Raspberry Pi<br>Rich visual interface for module calibration and data viewing, logging and management.<br>Periodic unassisted measurements.<br>Access to the measured data remotely via an http call or locally at the OS console.<br>Visual interface for Raspberry Pi<br>Simultaneous visualization of pH, temperature and voltage values.<br>Accessible from every device with an installed browser.<br>Manage, list and plot data from periodic unassisted measurements or points at user choice.<br>Calibration with many options - temperature compensated data for 13 buffer solutions and an option to use the sensor’s isopotential data.<br>pH range: 0 ÷ 14 pH<br>pH resolution: 0.01 pH<br>Board specification<br>input voltage range:<br>-900 mV ÷ 2048 mV<br>supply voltage:<br>3.3 to 5 V<br>resolution<br>pH 3 - pH 11:<br>0.002 pH<br>pH inaccuracy*:<br>(temperature adjusted)<br>pH 4 to 10:<br>not more than 0.03 pH<br>pH 2 to 12:<br>not more than 0.05 pH<br>overall dimensions, W:H:D:<br>59 : 37 : 36 mm (2.3 : 1.5 : 1.4 in)<br>board dimensions, W:D:<br>56 : 20 mm (2.20 : 0.79 in)<br>* The inaccuracy of the measurement depends on the precision of the performed calibration. The specified value is valid for 2-point calibration where the buffers' inaccuracy is not greater than 0.02 pH units and their temperature difference with the sample is less th