![Image](http://www.mikronauts.com/wp-content/upload/2014/06/Elf_HC-SR04_two_0560.jpg)
I've added photos showing
- how to wire the L9110S motor driver to RoboPi on Elf
- how to wire the HC-SR04 range sensor to RoboPi on Elf
And I also added a sample Python program for easily driving the L9110S motor driver on Elf
http://www.mikronauts.com/robot-zoo/elf-2wd-pi-robot/