The author of Instructables under the nickname MayukhN2 came up with a way to clearly explain the principle of the H-bridge to someone who had never seen him in his life. Actually, this is correct, if there were more of such simple, but very understandable visual aids. But even the KISS principle, it turns out, does not tolerate hypertrophy. The master forgot to put in the design only two parts, without which it will quickly fail. But if you put it, there will be no visual aid for the price. The principle of operation of the H-bridge will explain to anyone in two minutes.
Collecting homemade, the master dispenses with the circuit, but it is not difficult to restore it. Many readers, looking at it, will immediately guess what details need to be added.
The wizard prepares the components necessary for assembling the manual:
And begins to collect. Installs buttons in the breadboard type breadboard:
Behind them are the dupont jumpers:
And connected counter-parallel LEDs:
The wizard connects the battery compartment to the device:
And offers to test the training manual in. If you press the two buttons diagonally, one LED will light up, simulating the rotation of the electric motor in one direction. When two buttons are pressed on the other diagonal, the second LED will light up, simulating the rotation of the electric motor in the opposite direction. If you press two buttons horizontally, nothing will happen. Finally, you cannot press two buttons vertically, and even more so - you cannot press any three or all four buttons - this will lead to a short circuit. What????
Textbooks without "protection from the fool" should not exist at all in principle. But even if you use it correctly, avoiding dangerous situations, LEDs without a resistor will not last long.
So in front of you is a modified outline of the manual. Added to it: a bulb (3.5 V, 0.26 A) - a short-circuit indicator and at the same time protection from it, as well as a resistor (about 200 Ohms) to limit the current through the LEDs.
Add these two components to the scheme when repeating, and it will completely remove the bullshit from the proposed textbook. It will become very good and useful.