如下图所示，蜂鸣器为板载元器件，所以不需要外接其他设备。

将机器人打开电源开机，运行程序代码即可。

import RPi.GPIO as GPIO
import timeBuzzer = 11CL = [0, 131, 147, 165, 175, 196, 211, 248]		# Frequency of Low C notes
CM = [0, 262, 294, 330, 350, 393, 441, 495]		# Frequency of Middle C notes
CH = [0, 525, 589, 661, 700, 786, 882, 990]		# Frequency of High C notes
song_1 = [	CM[3], CM[5], CM[6], CM[3], CM[2], CM[3], CM[5], CM[6], # Notes of song1CH[1], CM[6], CM[5], CM[1], CM[3], CM[2], CM[2], CM[3], CM[5], CM[2], CM[3], CM[3], CL[6], CL[6], CL[6], CM[1],CM[2], CM[3], CM[2], CL[7], CL[6], CM[1], CL[5]	]beat_1 = [	1, 1, 3, 1, 1, 3, 1, 1, 			# Beats of song 1, 1 means 1/8 beats1, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 3	]song_2 = [	CM[1], CM[1], CM[1], CL[5], CM[3], CM[3], CM[3], CM[1], # Notes of song2CM[1], CM[3], CM[5], CM[5], CM[4], CM[3], CM[2], CM[2], CM[3], CM[4], CM[4], CM[3], CM[2], CM[3], CM[1], CM[1], CM[3], CM[2], CL[5], CL[7], CM[2], CM[1]	]beat_2 = [	1, 1, 2, 2, 1, 1, 2, 2, 			# Beats of song 2, 1 means 1/8 beats1, 1, 2, 2, 1, 1, 3, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 3 ]def setup():GPIO.setwarnings(False)GPIO.setmode(GPIO.BOARD)		# Numbers GPIOs by physical locationGPIO.setup(Buzzer, GPIO.OUT)	# Set pins' mode is outputglobal Buzz						# Assign a global variable to replace GPIO.PWMBuzz = GPIO.PWM(Buzzer, 440)	# 440 is initial frequency.Buzz.start(50)					# Start Buzzer pin with 50% duty rationdef loop():while True:print('\n    Playing song 1...')for i in range(1, len(song_1)):		# Play song 1Buzz.ChangeFrequency(song_1[i])	# Change the frequency along the song notetime.sleep(beat_1[i] * 0.5)		# delay a note for beat * 0.5stime.sleep(1)						# Wait a second for next song.print('\n\n    Playing song 2...')for i in range(1, len(song_2)):     # Play song 1Buzz.ChangeFrequency(song_2[i]) # Change the frequency along the song notetime.sleep(beat_2[i] * 0.5)     # delay a note for beat * 0.5sdef destory():Buzz.stop()					# Stop the buzzerGPIO.output(Buzzer, 1)		# Set Buzzer pin to HighGPIO.cleanup()				# Release resourceif __name__ == '__main__':		# Program start from heresetup()try:loop()except KeyboardInterrupt:  	# When 'Ctrl+C' is pressed, the child program destroy() will be  executed.destory()

 运行以上代码，小车即发出蜂鸣的声音。