(fingertones)

I made this instrument in one class. It has two LDRs, one 1k resistor, one 10k, and one 100Ω. two speakers, and one button. one speaker for each LDR, and a button to turn the sound on or off. It plays different notes according to the light. When it's surroundings are dark, it plays higher notes, and when it's surroundings are light, it will not make any noise, or the noise will be lower.