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+====== Lab 3a - Finishing mic-servo application ======
+In [[:dig:lab_3_ardu]] you built a microphone preamplifier and you wrote (or modified) code to control the servo motor.
+In [[:dig:lab_4]] you will design the schematics of a daughterboard PCB.
+In this exercise you will start from a working example of the mic-servo program and modify it.
+Here are the steps of this exercise.
+  - Download the working example project {{:dig:mic-servo.zip}} and use the AVR32 code here as a starting point or template.
+  - Build your own Arduino Sketch for the DSP chain.
+  - Program your Arduino Nano and try to run it. Does it work?
+  - If after several tries you give up, you can try {{:dig:audio_dsp_servo_t2.zip| this code}} that includes a modified MSTimer2.cpp that overflows every 100us as a fixed rate.