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--- misc:hacks:buzzer [2015-03-16 18:11]
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+++ misc:hacks:buzzer [2015-07-15 16:31]
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+====== Adding a buzzer ======
+This guide shows how to add a piezo buzzer to a Crazyflie 2.0 prototype deck and control it using the parameters from the Crazyflie Python client.
+====== What you need ======
+For this hack you will need:
+  * Soldering iron
+  * Piezo buzzer
+  * [[projects:crazyflie2:expansionboards:proto|Crazyflie 2.0 prototype deck]]
+  * [[projects:crazyflie2:expansionboards:breakout|Crazyflie 2.0 breakout deck]] (optional, just needed for testing different buzzers)
+  * Some wire
+====== Building ======
+To get extra volume out of the buzzer we will use differential-drive using PWM on two pins, each connected to one terminal of the buzzer. This will give a -3V to 3V swing instead of 0-3V between on/off.
+The buzzer should be connected to the [[projects:crazyflie2:expansionboards:index|TX2/RX2 pins on the expansion header]] which also has PWM functionality using TIM5 channel 3/4.
+) Try out different buzzers using the Crazyflie 2.0 breakout deck and a few wires
+{{:misc:hacks:cf2_proto_board_buzzer_2.jpg?direct&200|}}
+{{:misc:hacks:cf2_proto_board_buzzer_1.jpg?direct&200|}}
+) Select a buzzer to solder to a Crazyflie 2.0 prototype deck using a few wires
+{{:misc:hacks:cf2_buzzer_material.jpg?direct&200|}}
+{{:misc:hacks:cf2_buzzer_proto_bottom_1.jpg?direct&200|}}
+{{:misc:hacks:cf2_buzzer_proto_bottom_2.jpg?direct&200|}}
+{{:misc:hacks:cf2_buzzer_proto_top_1.jpg?direct&200|}}
+) Attach the prototype deck with the buzzer to the Crazyflie 2.0 with the male headers in the box
+{{:misc:hacks:cf2_buzzer_proto_top_2.jpg?direct&200|}}
+{{:misc:hacks:cf2_buzzer_proto_top_3.jpg?direct&200|}}
+====== Firmware ======
+In order to do fun things with the buzzer there needs to be some firmware. The firmware can be found on the [[https://github.com/bitcraze/crazyflie-firmware/tree/dev-buzzer|dev-buzzer branch]] in the Crazyflie 2.0 repo on GitHub.  Build the firmware and flash it.
+The buzzer is implemented in a similar fashion as the [[projects:crazyflie2:expansionboards:ledring|LED-ring deck]]. Using a parameter you can set the current effect of the buzzer. Below is a list of the parameters that are interesting.
+<WRAP group>
+<WRAP half column>
+^  Parameter  ^  Comment  ^
+| buzzer.effect | Sets the current effect (max buzzer.neffects - 1) |
+| buzzer.melody | Set the current melody (needs buzzer.effect = 2) |
+| buzzer.freq | Set static frequency (needs buzzer.effect = 0) |
+| buzzer.radio | Set the duty cycle (in 8 bits) for the PWM (should be 127) |
+</WRAP>
+<WRAP half column>
+^  Effect ID ^  Comment  ^
+| 0 | Static tone/ratio |
+| 1 | Alarm |
+| 2 | Play a melody (selected by buzzer.melody) |
+| 3 | Frequency varies with pitch (when above 5 or below -5 degrees) |
+</WRAP>
+</WRAP>
+Have a look in the [[https://github.com/bitcraze/crazyflie-firmware/blob/dev-buzzer/modules/src/buzzer.c|modules/src/buzzer.c]] file for adding new melodies and effects.
+====== Result ======
+[[https://vine.co/v/OViKTETHt99|Vine]] (enabling the sound is a good idea :-) )

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