Easy to do technological inventions with high score rewards!!

Small electronic balance model, note that this is a model, and it can only weigh very light objects, such as two small scraps of paper. The materials needed for the production are: a wooden board (preferably a little thinner, not too large), a washer, a paper clip, an awl, an electric soldering iron, several wires, two light-emitting diodes, a battery.

These materials are easy to find, and if you don't have LEDs, you can go to the electronics market and buy them, which are very cheap.

The production process is as follows: turn a small hole with an awl in the middle of the board, bend a paper clip into a hook shape, and fix it perpendicular to the board through the small hole, and hook it to hang the washer. Then take two paper clips and straighten them in half, leaving only one turn, which is actually the arm of the balance and the rest of the curved part is the tray.

Another paper clip does the same. Then the two paper clips and washers are welded together, the washers are in the middle, and the paper clips are in a straight line. Then hang the washer on the hook and adjust the distance between the hook and the board, about 3mm.

Then fix two paper clips under two trays, and next to the paper clips are ready to use LEDs as indicator lights. With a circuit underneath the wooden board, the balance is equivalent to a SPDT switch. This circuit is equivalent to two circuits, sharing one power supply and two light-emitting diodes.

As long as the left side sinks, the left tray will communicate with the pin under him, so that the circuit is turned on and the diode emits light; If the weight of both sides is equal, the circuit is not open, and both diodes are not lit.

Well, it's up to you. If you want to invent, you have to break up and reorganize what exists. Because I don't think you're at the point where you can change the internal structure of matter and the distribution of particles.

Then you can only look at what you have. Of course, the most special ones are chemical reactants. If you want to create something that has an ontology effect instead of waiting for it to have an effect, you need to learn a little bit about physics and chemistry.

It depends on how much you know. If you just want to create something that is waiting to have an effect, it's best to do it. He just needs you to have a mind.

Splitting and reorganizing existing substances. There are many ways to split, such as material splitting, reaction splitting, and manual splitting. Hehe, I hope it can help you a little.

Production method: 1. The slippers should be larger than the shoes you usually wear, so that they can be easily worn on the shoes.

2. Use rag strips as mop strips on the soles of shoes, and nail a thick layer of plastic bottom on the mop strips, which is both waterproof and durable.

3. Use a cloth shell and a tarp to make an upper, and install a zipper on the back root of the upper, which is easy to put on and take off. Connect the upper to the sole and the slip-flop is ready.