Arduino Theremin
An Arduino Theremin using Arduino, an ultrasonic sensor, and a speaker that produces varying sound pitches based on the distance of an object from the sensor.
Description
The Arduino Theremin is a musical instrument that produces different sounds based on the distance of an object from the ultrasonic sensor. The ultrasonic sensor measures the distance of the object and sends the data to the Arduino. The Arduino processes this data and generates corresponding sound frequencies through the speaker. The pitch of the sound changes based on the distance, similar to how a traditional theremin works. This project combines music and sensor-based interaction to create a fun and creative experience.
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An AND gate can be built using BC547 NPN transistors, a common general-purpose transistor used in digital circuits.
The circuit represents both the inputs A & B for the AND gate and Output, Q, which also has a +5V supply to the collector of the first transistor, which is connected in series to the second transistor, and an LED is connected to the emitter terminal of the second transistor. The inputs A & B are connected to the base terminal of Transistor 1 and Transistor 2, respectively, and the output Q goes to the positive terminal LED.
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A Reaction Time Game is an interactive electronic project designed to measure a user’s response speed. Using an Arduino, keypad, buzzer, and LCD, the system tests how quickly a player can respond to a visual or auditory signal. This project is widely used in educational setups, gaming, and psychology experiments to study reflexes and reaction times.













