Difference between revisions of "BakeBit - Buzzer"
From FriendlyELEC WiKi
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buzzer_pin = 3 #Port for buzzer | buzzer_pin = 3 #Port for buzzer | ||
button = 4 #Port for Button | button = 4 #Port for Button | ||
| − | + | old_button_status = -1 | |
pinMode(buzzer_pin,"OUTPUT") # Assign mode for buzzer as output | pinMode(buzzer_pin,"OUTPUT") # Assign mode for buzzer as output | ||
pinMode(button,"INPUT") # Assign mode for Button as input | pinMode(button,"INPUT") # Assign mode for Button as input | ||
| + | |||
| + | buzzer_on = False | ||
| + | old_buzzer_on = not buzzer_on | ||
| + | button_pressed = False | ||
| + | |||
while True: | while True: | ||
try: | try: | ||
| − | button_status= digitalRead(button) #Read the Button status | + | while True: |
| − | + | button_status = digitalRead(button) #Read the Button status | |
| − | + | # print button_status | |
| − | + | if old_button_status < 0: | |
| − | else: | + | break |
| − | analogWrite(buzzer_pin, | + | |
| − | + | 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 | except KeyboardInterrupt: # Stop the buzzer before stopping | ||
digitalWrite(buzzer_pin,0) | digitalWrite(buzzer_pin,0) | ||
break | break | ||
except (IOError,TypeError) as e: | except (IOError,TypeError) as e: | ||
| − | print("Error") | + | print("Error") |
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 05:52, 17 April 2017
Contents
1 Introduction
- 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
- 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:
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")
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 users press the button the buzzer will beep. When the button is released the buzzer will be silent.
4 Resources
- [Schematic](BakeBit - Buzzer.pdf)
- [BakeBit Github Project Page](https://github.com/friendlyarm/BakeBit)
- [BakeBit Starter Kit User's Manual](http://wiki.friendlyarm.com/bakebit/bakebit_starter_kit_manual_en.pdf)
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"
