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.

For this hack you will need:

• Soldering iron
• Piezo buzzer
• Crazyflie 2.0 prototype deck
• Crazyflie 2.0 breakout deck (optional, just needed for testing different buzzers)
• Some wire

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 TX2/RX2 pins on the expansion header which also has PWM functionality using TIM5 channel 3/4.

1) Try out different buzzers using the Crazyflie 2.0 breakout deck and a few wires

2) Select a buzzer to solder to a Crazyflie 2.0 prototype deck using a few wires

3) Attach the prototype deck with the buzzer to the Crazyflie 2.0 with the male headers in the box

In order to do fun things with the buzzer there needs to be some firmware. The firmware can be found on the 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 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.

Have a look in the modules/src/buzzer.c file for adding new melodies and effects.

Vine (enabling the sound is a good idea )