This Passive Buzzer is 5V 42 Ohms and offers an easy way to add a simple audio output to your robot. While you can't expect this tiny speaker to produce orchestral quality sound, it works great for simple beeps and boops. You can even program your robot to play a little song to wish your best friend a happy birthday. The great thing about this buzzer is that it can be connected directly to a 5V microcontroller pin without any additional hardware. To use this buzzer with an Arduino, simply connect one pin to a digital output and the other pin to ground and “presto!” - your Arduino can now play simple sounds. Use Arduino's “tone” function to make simple sounds or play around with PWM for more complex sounds.
