The crane can lift the weight of 50 subways⁉️

this buzzerwill ringThe reason is because of the salt water (Sodium chlorideNaCl) isStrong electrolyte, soluble in water, can be completely dissociated into chloride ions(Na+)and sodium ions(Cl-),connectAfter the electrode, the negative ions will go in the positive direction; while the positive ions will go in the negative direction, this process will generate current and electrify.

Through coins, we can make the earliest chemical battery, the voltaic pile(Voltaic pileThe principle of power generation is because "different metals have different oxidation activities. When two different types of metals are installed in an electrolyte aqueous solution, they will undergo a chemical reaction to release electrical energy, and a chemical effect of current will occur."

The coin is the positive electrode of the battery, the tin foil is the negative electrode of the battery, and the paper dipped in salt water is the electrolyte. Using the principle of metal activity and redox, the coin can generate electricity.

Use several micro:bits to make a physical treasure hunt through radio communication.

source: https://microbit.org/projects/make-it-code-it/treasure-hunt/

Turn the LED display into a sensor, allowing the micro:bit to react to light

source: https://microbit.org/projects/make-it-code-it/sunlight-sensor/