Window Painting Robot (arduino, processing, accelerometer)

Step 3: Magnets (so attractive)

The next import part is to mount your magnets to the underside of the frame. As you can see in my pictures I have it along the line that the motor shafts are, so when the robot turns it revolves around the magnet and will offer little resistance to keep the driving precise. The magnet should be mounted so that when the wheels are attached and the robot is pressed against the wall it will be just a millimeter from the surface of the glass. This height is tough to gauge without the wheels added yet, but it is important to make sure you can mount the magnets and the exact height can be adjusted with washers or nuts later. I actually kept the magnet off after this point to make the rest of the building easier.