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1. A method to control a mixer for concrete, mortar, powders, dry and semi-dry granulates, cement-based mixes or similar or comparable mixes or mixtures, comprising: providing a mixer, performing an input step that communicates to a control and command unit of the mixer a plurality of input data correlated to a formulation of a mix to be treated in a mixing cycle of the mixer, performing a detection step that detects the values of an electric quantity characteristic of an electric power line of a drive unit comprised in the mixer, performing a processing step in which said control and command unit processes the values detected in the detection step in order to calculate an overall active power that is generated as a function of time and to carry out one or more verifications, comparing the values processed with one or more of the respective data introduced among the plurality of input data in order to transmit to a programmable logic controller that commands the functioning of the mixer and commands at least one of a consent signal to discharge the mix subjected to the mixing cycle or an anomaly signal selectively correlated to the verification or verifications that have had a negative outcome, and wherein the consent signal or the anomaly signal alert an operator to respectively command at least one of the discharge of the mix from the mixer or consequent corrective actions on the mixing cycle, and wherein the processing step graphically plots a first curve, a shape of which shows the average values calculated of the overall active power as a function of time, and a second curve having a shape that substantially follows the shape of the first curve but has an oscillating shape characterized by a succession of peaks and hollows, and which shows the shape of the values calculated, instant by instant, of the overall active power as a function of time and net of the average values, and further wherein the development of said first curve and of said second curve are respectively correlated to a consistency and a homogeneity of the mix subjected to the mixing cycle, and wherein the processing step compares the values of the average overall active power with a predetermined threshold value introduced among the plurality of input data, below which it is deemed that the consistency of the mix is adequate, and also calculates the distance, measured parallel to the y-axis, between each oscillation peak and the subsequent hollow, and subsequently compares the calculated distance with a predetermined distance value that functions as a threshold value introduced among the plurality of input data below which it is deemed that the homogeneity of the mix is adequate.
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