BiBoard Extension Hat
BiBoard Hat V1.0 is the extension board of BiBoard V0 for convenient connection of the voice command and other Grove extensible modules.
BiBoard(left) and the extension hat
The extension hat has an onboard voice command module and four grove sockets.
- 1x Serial2 port (GPIO16, 17).You must dial the slide switch to UART2 to free it for regular serial communication or GPIO. In that case, the Tx pin (GPIO 17) can be used to write.
- 1x I2C port （GPIO21, 22). It's already used by the main program to read sensors. If you use the BiBoard as a regular ESP32 board without Bittle's firmware, they can be configured as regular GPIO pins to read and write.
- 2x input-only pins (GPIO 34, 35, 36, 39).
We adopted the Grove sockets for convenient plug-and-play connections. There are three types of sockets:
BiBoard provides the 5V power supply of the grove sockets, while the 5V comes from the battery. So the devices connected to the Grove sockets can only work when connected to the BiBoard and powered by the battery.
BiBoard's 3.3V powers the voice module. The 3.3V can be supplied from the USB. So it can work without battery power.
It's shared with the voice command module. When the switch is dialed to VOICE COMMAND, Serial2 port can NOT be used. You can dial the slide switch to UART2 to free it for regular serial communication or GPIO.