BakeBit - Green LED

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1 Introduction

Green LED

• The BakeBit - Green LED is an LED module. This module has a a triode which is used to turn the LED on or off. There is a potentiometer in series connection with the LED. When users adjust the potentiometer the LED's luminance will be changed accordingly.Or you input PWM signals to control the the LED's luminance.

2 Hardware Spec

• Standard 2.0mm 4-Pin BakeBit Interface
• LED's luminance adjustable
• Digital Input

• Pin Description:

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

3 Code Sample:LED Blink

3.1 Hardware Connection

连接LED到NanoHUB扩展板的D3接口：

3.2 Source Code

import time
from bakebit import *
 
# Connect the BakeBit LED to digital port D3
led = 3
 
pinMode(led,"OUTPUT")
time.sleep(1)
 
print ("This example will blink a BakeBit LED connected to the BakeBit on the port labeled D3.\nIf you're having trouble seeing the LED blink, be sure to check the LED connection and the port number.\nYou may also try reversing the direction of the LED on the sensor.")
print (" ")
print ("Connect the LED to the port labele D3!" )
 
while True:
    try:
        #Blink the LED
        digitalWrite(led,1)		# Send HIGH to switch on LED
        print ("LED ON!")
        time.sleep(1)
 
        digitalWrite(led,0)		# Send LOW to switch off LED
        print ("LED OFF!")
        time.sleep(1)
 
    except KeyboardInterrupt:	# Turn LED off before stopping
        digitalWrite(led,0)
        break
    except IOError:				# Print "Error" if communication error encountered
        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_led_blink.py" program:

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

3.4 Observation

The BakeBit LED keeps blinking and the interval between two blinks is one second.

4 相关资料

• [Schematic](BakeBit - Green LED.pdf)
• [BakeBit Github项目](https://github.com/friendlyarm/BakeBit)
• [BakeBit Starter Kit手册](http://wiki.friendlyarm.com/bakebit/bakebit_starter_kit_manual_cn.pdf)