[speed] = readSpeed(pidObj)returns the current rotational speed of the DC motor in closed-loop control as read by the quadrature encoder connected to encoder channel number corresponding to PID motor number.
[speed,timestamp] = readSpeed(pidObj)returns the current rotational speed of the DC motor in closed-loop control as read by the quadrature encoder connected to encoder channel number corresponding to PID motor number, and the timestamp in datetime format.
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