May 11, 2026 Software Open Access

Loli Salcedo, Romel Enrique

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    "publication_date": "2026-05-11", 
    "title": "Automated pulp-level control in laboratory scale froth flotation", 
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    "description": "<p>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.</p>\n\n<p>The package includes two calibration scripts used to generate the calibration file required by the control scripts. The&nbsp;<strong>two-point calibration</strong>&nbsp;script represents the initial calibration approach, where a linear relationship between sensor voltage and level was calculated from two reference points. The&nbsp;<strong>five-point piecewise calibration</strong>&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.</p>\n\n<p>The package also includes the file&nbsp;<strong>Automatic Control.py, it&nbsp;</strong>contains the base control script without EWMA filtering.&nbsp;The file&nbsp;<strong>Automatic control upgraded.py</strong>&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.</p>\n\n<p>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.</p>\n\n<p>&nbsp;</p>", 
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