May 11, 2026 Software Open Access

Loli Salcedo, Romel Enrique

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    <subfield code="a">&lt;p&gt;This code package contains the Python scripts used for automated pulp-level control in a lab-scale batch flotation cell. The scripts were developed for a Raspberry Pi-based control system using a Milone eTape level sensor, ADS1115 analog-to-digital converter, and EZO-PMP-L peristaltic pump. The system measures the pulp-froth interface level, compares it with a user-defined setpoint, and adds make-up water through the pump to maintain the target level during flotation experiments.&lt;/p&gt;

&lt;p&gt;The package includes two calibration scripts used to generate the calibration file required by the control scripts. The&amp;nbsp;&lt;strong&gt;two-point calibration&lt;/strong&gt;&amp;nbsp;script represents the initial calibration approach, where a linear relationship between sensor voltage and level was calculated from two reference points. The&amp;nbsp;&lt;strong&gt;five-point piecewise calibration&lt;/strong&gt;&amp;nbsp;script represents the refined calibration method, where five reference levels were used to better describe the nonlinear response of the eTape sensor over the operating range.&lt;/p&gt;

&lt;p&gt;The package also includes the file&amp;nbsp;&lt;strong&gt;Automatic Control.py, it&amp;nbsp;&lt;/strong&gt;contains the base control script without EWMA filtering.&amp;nbsp;The file&amp;nbsp;&lt;strong&gt;Automatic control upgraded.py&lt;/strong&gt;&amp;nbsp;contains the upgraded control version with five-point piecewise calibration and EWMA signal filtering. Both scripts include real-time plotting and CSV logging of level, error, and pump output for later analysis.&lt;/p&gt;

&lt;p&gt;These scripts were used as part of the thesis work on automated lab-scale pulp-froth interface level control for improving reproducibility in batch flotation experiments.&lt;/p&gt;

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    <subfield code="a">Automated pulp-level control in laboratory scale froth flotation</subfield>
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