A quadrupedal robot capable of walking, running, standing up and self-stabilizing.
https://raspberrypi.stackexchange.com/questions/67328/send-image-from-one-raspberry-pi-to-another-via-socket
https://www.waveshare.com/wiki/Raspberry_Pi_Tutorial_Series
For example code see raspi/Pioneer600/OLED/
https://www.airspayce.com/mikem/bcm2835/index.html
https://www.waveshare.com/wiki/Raspberry_Pi_Tutorial_Series:_SPI
https://en.wikipedia.org/wiki/Serial_Peripheral_Interface