mDrawbot is a four-in-one drawing robotic kit, you can assembly into 4 different configuration drawing robots, learn more from Makeblock official website
I don't know how this can work on the Arduino. strtok_r returns a null pointer if there are no more tokens and str[0] seems to be poking around in that null pointer.
I don't know how this can work on the Arduino. strtok_r returns a null pointer if there are no more tokens and str[0] seems to be poking around in that null pointer.