Automated pulp-level control in laboratory scale froth flotation

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.

The package includes two calibration scripts used to generate the calibration file required by the control scripts. The two-point calibration script represents the initial calibration approach, where a linear relationship between sensor voltage and level was calculated from two reference points. The five-point piecewise calibration 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.