The PAM8403 is an Amplifier Board that can be powered using simple 5V input and could drive two 3W + 3W stereo speakers. It is an excellent choice for, who wants a Class-D stereo audio amplifier in a small board space.
The PCA9685 is a 16-channel I2C-bus controlled LED controller optimized for Red/Green/Blue/Amber (RGBA) color backlight. Each LED output has individual 12-bit resolution (4096 steps) PWM controller with a fixed frequency.
The PCF8591 is a monolithic single supply low power 8-bit CMOS data acquisition device. PCF8591 has four analog inputs, one analog output and a serial I2C bus interface.