This adds support for a cheap ultrasonic sensor (HC-SR04) to the Crazyflie 2.0.
- 1x HC-SR04
- 1x TI REG71050DDCT
- 1x Maxim DS28E05
- 2x Taiyo Yuden 2.2 uF EMK316BJ225KL-T
- 1x Taiyo Yuden 0.22 uF LMK107B7224KA-T
The HC-SR04 expansion board uses the following GPIO ports:
IO_1 / PB8
: HC-SR04 TriggerIO_2 / PB5
: HC-SR04 EchoIO_4 / PC12
: REG71050 Enable