docs

doc/intro.md

@@ -7,6 +7,8 @@ adwin_control is a python project aiming the replacement of analog PID controlle
 
 A `adwin_control.ServoDevice` is a model of the whole ADwin device.
 Each device can control eight servos modeled by `adwin_control.Servo`.
+The device has a real time program running on the internal CPU.
+It can be controlled by using this software package over a LAN connection.
 
 ![Servo device](_static/servo_device.png)
 
@@ -16,7 +18,7 @@ Additionally an aux signal can be added to make a system analysis.
 
 ![Servo principle](_static/servo_scheme.png)
 
-The program runs with a sampling rate of 100kHz which can be increased if needed.
+The real time program runs with a sampling rate of 100kHz which can be increased if needed.
 That implies that the captured frequency has an upper limit of a little less than 50kHz.
 But the phase shift gets too large for frequencies of more than about 10 till 15kHz.
 Therefore, that is the highest frequency that can be used for real life.