You’ve turned your pickle into a battery! Here’s how it works:
Pickles contain salt water, which is rich in charged particles called ions. The aluminum and the graphite react with these ions, setting off an electrical tug-of-war between the two materials. The material with the stronger pull—aluminum—takes electrons away from the graphite, triggering a flow of electrons around the circuit. This current powers the buzzer.
Most common batteries—such as your car battery and the batteries inside your flashlight—work on the same principle that your pickle battery works on: They use two metals suspended in an ion-rich liquid or paste to separate electric charge, and create an electrical current around a circuit.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.