BakeBit - Button

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1 Introduction

Button

• The BakeBit - Button is an instant button module and it is used to detect button events. When the button is released the module goes back to its default state.
• If the button is not pressed the module will output high otherwise it will output low.

2 Hardware Spec

• Standard 2.0mm pitch 4-Pin BakeBit interface
• Digital output
• PCB dimension(mm): 20 x 24

• Pin Description:

Pin	Description
GND	Ground
5V	Supply Voltage 5V
NC	Not Connected
SIG	Signal

3 Code Sample: Button And Buzzer

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

3.1 Hardware Connection

Connect the buzzer module to the NEO-Hub at D3 and the button module to the NEO-Hub at D4:

3.2 Source Code

import bakebit
import time
# Connect the BakeBit Ultrasonic Ranger to digital port D4
# SIG,NC,VCC,GND
ultrasonic_ranger = 4
 
# Connect the BakeBit LED to digital port D3
led = 3                                                                      
 
bakebit.pinMode(led,"OUTPUT")
light = 0
 
while True:
    try:
        # Read distance value from Ultrasonic
	distance = bakebit.ultrasonicRead(ultrasonic_ranger)
        print(distance)
	if distance > 0:
		if distance<10: 
			if light == 0:
				print("\ton")
				bakebit.digitalWrite(led,1)
				light = 1
		else:
			if light == 1:
				print("\toff")
				bakebit.digitalWrite(led,0)
				light = 0
	time.sleep(.2)
 
    except KeyboardInterrupt:
	bakebit.digitalWrite(led,0)
        break
 
    except TypeError:
        print ("Error")
    except IOError:
        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 users press the button the buzzer will beep. When the button is released the buzzer will be silent.

4 Resources

• [Schematic](BakeBit - Button.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-12-2016

• Released English version