The object of this program is to discover the pattern of switches needed to spin the propeller continuously clockwise. You might start by clicking any one of the blue switch levers and noting which direction the propeller turns. Once you discover the pattern, try for a full rotation, one clockwise and one counter-clockwise. Quadcopter motors are made to spin by applying voltage to each of the three motor leads and then applying the voltage to different leads using switches in a repeating pattern of six steps. Each step requires the toggling of one of the three switches. To toggle a switch, click on one of the blue switch levers. If the lever is currently up, toggling will bring it down, and conversely, if down, toggling will take the lever up. Note that when a switch is up, the positive (+) terminal connected to the battery will then be connected to one end of the motor coils, A, B or C. For example if switches S1 & S2 are down and S3 is up, the positive battery lead will be connected to coil A, and the negative battery lead will be connected to coil wires B & C. Electric current will then flow through the A coil and then split between coils B & C (half one way, half the other), returning again to the battery. Enjoy.
I'm a retired electrical engineer, and I'm always looking to find something of interest to my grandchildren. So a while back I purchased a quadcopter motor to learn the basics of how the motor works. In addition, I purchased three switches and wired these to the motor and battery exactly like the schematic shown here. Once connected, I toggled the switches and learned the required switch sequence for clockwise rotation just as you can here. The best part is that with Scratch, each of my seven grandchildren can have their own simulator.
