Difference between revisions of "BakeBit - Buzzer"

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[[BakeBit - Buzzer/zh|查看中文]]
 
[[BakeBit - Buzzer/zh|查看中文]]
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 +
==Introduction==
 +
[[File:BakeBit - Buzzer.jpg|thumb|Buzzer]]
 +
* The BakeBit-Buzzer is a passive buzzer. To drive this buzzer an oscillating source generating 2.7K square waves is needed.
 +
* PWM input signals with different frequencies generate different sounds.
 +
* It can be used in electronic devices that need sound generators.
 +
 +
==Hardware Spec==
 +
* Standard 2.0mm pitch 4 Pin BakeBit interface
 +
* PWM input
 +
* PCB dimension(mm): 20 x 24
 +
[[File:BakeBit - Buzzerpcb.png|frameless|300px| Buzzer PCB]]
 +
 +
* Pin Description:
 +
{| class="wikitable"
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|-
 +
|Pin || Description
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|-
 +
|GND    || Supply Voltage 5V
 +
|-
 +
|5V    || Gound
 +
|-
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|NC    || Not Connected
 +
|-
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|SIG    || PWM Input
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|}
 +
 +
== Code Sample: Button And Buzzer ==
 +
 +
A [[BakeBit - Button]] module is needed in this test case.
 +
 +
=== Hardware Setup ===
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Connect the buzzer module to the NanoHat Hub's D3 and the button module to the NanoHat Hub's D4:
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 +
::{| class="wikitable"
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|-
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|[[File:Button And Buzzer-1.jpg |frameless|300px]]    || [[File:Button And Buzzer-2.jpg |frameless|300px]]
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|-
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|}
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 +
=== Source Code ===
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<syntaxhighlight lang="python">
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import time
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from bakebit import *
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import math
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buzzer_pin = 3 #Port for buzzer
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button = 4 #Port for Button
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old_button_status = -1
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pinMode(buzzer_pin,"OUTPUT") # Assign mode for buzzer as output
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pinMode(button,"INPUT") # Assign mode for Button as input
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buzzer_on = False
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old_buzzer_on = not buzzer_on
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button_pressed = False
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while True:
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try:
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while True:
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button_status = digitalRead(button) #Read the Button status
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# print button_status
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if old_button_status < 0:
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break
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if button_status != old_button_status:
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break
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time.sleep(0.2)
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old_button_status = button_status
 +
 +
if button_status == 0:
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button_pressed = True
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else:
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if button_pressed:
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buzzer_on = not buzzer_on
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button_pressed = False
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if old_buzzer_on != buzzer_on:
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old_buzzer_on = buzzer_on
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if buzzer_on:
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analogWrite(buzzer_pin,127)
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print "Buzzing"
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else:
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analogWrite(buzzer_pin,0)
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print "\tOff"
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time.sleep(0.2)
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except KeyboardInterrupt: # Stop the buzzer before stopping
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digitalWrite(buzzer_pin,0)
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break
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except (IOError,TypeError) as e:
 +
print("Error")
 +
</syntaxhighlight>
 +
 +
[https://github.com/friendlyarm/BakeBit/blob/master/Software/Python/bakebit_prj_Button_And_Buzzer.py Github]
 +
 +
=== Run Code Sample ===
 +
 +
Before you run the code sample you need to follow the steps in [http://wiki.friendlyarm.com/bakebit bakebit tutorial] to install the BakeBit package.<br />
 +
Enter the "BakeBit/Software/Python" directory and run the "bakebit_prj_Button_And_Buzzer.py" program:
 +
<syntaxhighlight lang="bash">
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cd ~/BakeBit/Software/Python
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sudo python bakebit_prj_Button_And_Buzzer.py
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</syntaxhighlight>
 +
 +
=== Observation ===
 +
 +
When the button is clicked the buzzer will beep and if it is clicked again the buzzer will be silent.
 +
 +
==Resources==
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*[Schematic]([http://wiki.friendlyarm.com/wiki/images/5/5b/04-SCHEMATIC_Buzzer.pdf BakeBit - Buzzer.pdf])
 +
*[BakeBit Github Project Page](https://github.com/friendlyarm/BakeBit)
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*[BakeBit Starter Kit User's Manual](http://wiki.friendlyarm.com/bakebit/bakebit_starter_kit_manual_en.pdf)
 +
 +
==Update Log==
 +
===December-11-2016===
 +
* Released English version
 +
 +
===Jan-19-2017===
 +
* Renamed "NEO-Hub" to "NanoHat-Hub"
 +
 +
===Jan-20-2017===
 +
* Renamed "NanoHat-Hub" to "NanoHat Hub"

Latest revision as of 07:45, 17 April 2017

查看中文

1 Introduction

Buzzer
  • The BakeBit-Buzzer is a passive buzzer. To drive this buzzer an oscillating source generating 2.7K square waves is needed.
  • PWM input signals with different frequencies generate different sounds.
  • It can be used in electronic devices that need sound generators.

2 Hardware Spec

  • Standard 2.0mm pitch 4 Pin BakeBit interface
  • PWM input
  • PCB dimension(mm): 20 x 24

Buzzer PCB

  • Pin Description:
Pin Description
GND Supply Voltage 5V
5V Gound
NC Not Connected
SIG PWM Input

3 Code Sample: Button And Buzzer

A BakeBit - Button module is needed in this test case.

3.1 Hardware Setup

Connect the buzzer module to the NanoHat Hub's D3 and the button module to the NanoHat Hub's D4:

Button And Buzzer-1.jpg Button And Buzzer-2.jpg

3.2 Source Code

import time
from bakebit import *
import math
 
buzzer_pin = 3		#Port for buzzer
button = 4		#Port for Button
old_button_status = -1
pinMode(buzzer_pin,"OUTPUT")	# Assign mode for buzzer as output
pinMode(button,"INPUT")		# Assign mode for Button as input
 
buzzer_on = False
old_buzzer_on = not buzzer_on
button_pressed = False
 
while True:
	try:
		while True:
			button_status = digitalRead(button)	#Read the Button status
			# print button_status
			if old_button_status < 0: 
				break
 
			if button_status != old_button_status:
				break
 
		time.sleep(0.2)
		old_button_status = button_status
 
		if button_status == 0:
			button_pressed = True
		else:
			if button_pressed:
				buzzer_on = not buzzer_on
			button_pressed = False 
 
		if old_buzzer_on != buzzer_on:
			old_buzzer_on = buzzer_on
			if buzzer_on:
				analogWrite(buzzer_pin,127)
				print "Buzzing"
			else:
				analogWrite(buzzer_pin,0)
				print "\tOff"			
 
		time.sleep(0.2)			
	except KeyboardInterrupt:	# Stop the buzzer before stopping
		digitalWrite(buzzer_pin,0)
		break
	except (IOError,TypeError) as e:
		print("Error")

Github

3.3 Run Code Sample

Before you run the code sample you need to follow the steps in bakebit tutorial to install the BakeBit package.
Enter the "BakeBit/Software/Python" directory and run the "bakebit_prj_Button_And_Buzzer.py" program: 

cd ~/BakeBit/Software/Python
sudo python bakebit_prj_Button_And_Buzzer.py

3.4 Observation

When the button is clicked the buzzer will beep and if it is clicked again the buzzer will be silent.

4 Resources

5 Update Log

5.1 December-11-2016

  • Released English version

5.2 Jan-19-2017

  • Renamed "NEO-Hub" to "NanoHat-Hub"

5.3 Jan-20-2017

  • Renamed "NanoHat-Hub" to "NanoHat Hub"
Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=BakeBit_-_Buzzer&oldid=9991"