Difference between revisions of "BakeBit - Rotary Angle Sensor"

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[[BakeBit - Rotary Angle Sensor/zh|查看中文]]
 
[[BakeBit - Rotary Angle Sensor/zh|查看中文]]
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 +
==Introduction==
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[[File:BakeBit - Rotary Angle Senso.jpg|thumb|Rotary Angle Senso]]
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* The BakeBit - Rotary Angle Sensor module is a rotary sensor module. It acts as a variable resistor or rheostat.When the nub is rotated the resistance will change.
 +
 +
==Hardware Spec==
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* Standard 2.0mm pitch 4-Pin BakeBit Interface
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[[File:BakeBit - Rotary Angle Senso_PCB.png | frameless|320px|BakeBit - Rotary Angle Senso]]
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* Pin Description:
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{| class="wikitable"
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|-
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|Pin || Description
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|-
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|GND  || Ground
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|-
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|5V    || 5V Supply Voltage
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|-
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|NC    || Not Connected
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|-
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|SIG  || Signal
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|}
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== Code Sample(1): LED Fade ==
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A [[BakeBit - Rotary Angle Sensor]] module is needed in this test case.
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=== Hardware Setup ===
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Connect the LED module to the NanoHat Hub's D5 and the [[BakeBit - Rotary Angle Sensor]] module to the NanoHat Hub's A0:
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::{| class="wikitable"
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|-
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|[[File:LED Fade-1.jpg |frameless|300px]]    || [[File:LED Fade-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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import bakebit
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# Connect the BakeBit Rotary Angle Sensor to analog port A0
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# SIG,NC,VCC,GND
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potentiometer = 0
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# Connect the LED to digital port D5
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# SIG,NC,VCC,GND
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led = 5
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bakebit.pinMode(potentiometer,"INPUT")
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bakebit.pinMode(led,"OUTPUT")
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time.sleep(1)
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# Reference voltage of ADC is 5v
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adc_ref = 5
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# Vcc of the BakeBit interface is normally 5v
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bakebit_vcc = 5
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# Full value of the rotary angle is 300 degrees, as per it's specs (0 to 300)
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full_angle = 300
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while True:
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    try:
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        # Read sensor value from potentiometer
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        sensor_value = bakebit.analogRead(potentiometer)
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        # Calculate voltage
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        voltage = round((float)(sensor_value) * adc_ref / 1023, 2)
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        # Calculate rotation in degrees (0 to 300)
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        degrees = round((voltage * full_angle) / bakebit_vcc, 2)
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        # Calculate LED brightess (0 to 255) from degrees (0 to 300)
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        brightness = int(degrees / full_angle * 255)
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        # Give PWM output to LED
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        bakebit.analogWrite(led,brightness)
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        print("sensor_value = %d voltage = %.2f degrees = %.1f brightness = %d" %(sensor_value, voltage, degrees, brightness))
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    except KeyboardInterrupt:
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        bakebit.analogWrite(led,0)
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        break
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    except IOError:
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        print ("Error")
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</syntaxhighlight>
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[https://github.com/friendlyarm/BakeBit/blob/master/Software/Python/bakebit_rotary_angle_sensor.py Github]
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 +
=== Run Code Sample ===
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 +
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 />
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Enter the "BakeBit/Software/Python" directory and run the "bakebit_rotary_angle_sensor.py" program:
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<syntaxhighlight lang="bash">
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cd ~/BakeBit/Software/Python
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sudo python bakebit_rotary_angle_sensor.py
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</syntaxhighlight>
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=== Observation ===
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 +
When you rotate the rotary angle sensor module the LED’s luminance will change accordingly.
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 +
== Code Sample(2): Servo and Rotary Angle Sensor ==
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This code sample shows how to control a servo with the Rotary Angle Sensor module.<br />
 +
A [[BakeBit - Servo]] is needed in this test case. For more details about the servo module refer to the [[BakeBit - Servo]] page.
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 +
== Code Sample(3): LED Bar and Rotary Angle Sensor ==
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This code sample shows how to adjust sound volume with the rotary angle sensor module.<br />
 +
A [[BakeBit - LED Bar]] is needed in this test case. For more details about the LED Bar refer to the [[BakeBit - LED Bar]] page.
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==Resources==
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*[Schematic]([http://wiki.friendlyarm.com/wiki/images/0/01/03-SCHEMATIC_Rotary_Angle_Senso.pdf BakeBit - Rotary Angle Sensor.pdf])
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*[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)
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==Update Log==
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===December-13-2016===
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* Released English version
 +
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===Jan-19-2017===
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* Renamed "NEO-Hub" to "NanoHat-Hub"
 +
 +
===Jan-20-2017===
 +
* Renamed "NanoHat-Hub" to "NanoHat Hub"

Latest revision as of 08:16, 20 January 2017

查看中文

1 Introduction

Rotary Angle Senso
  • The BakeBit - Rotary Angle Sensor module is a rotary sensor module. It acts as a variable resistor or rheostat.When the nub is rotated the resistance will change.

2 Hardware Spec

  • Standard 2.0mm pitch 4-Pin BakeBit Interface

BakeBit - Rotary Angle Senso

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

3 Code Sample(1): LED Fade

A BakeBit - Rotary Angle Sensor module is needed in this test case.

3.1 Hardware Setup

Connect the LED module to the NanoHat Hub's D5 and the BakeBit - Rotary Angle Sensor module to the NanoHat Hub's A0:

LED Fade-1.jpg LED Fade-2.jpg

3.2 Source Code

import time
import bakebit
 
# Connect the BakeBit Rotary Angle Sensor to analog port A0
# SIG,NC,VCC,GND
potentiometer = 0
 
# Connect the LED to digital port D5
# SIG,NC,VCC,GND
led = 5
 
bakebit.pinMode(potentiometer,"INPUT")
bakebit.pinMode(led,"OUTPUT")
time.sleep(1)
 
# Reference voltage of ADC is 5v
adc_ref = 5
 
# Vcc of the BakeBit interface is normally 5v
bakebit_vcc = 5
 
# Full value of the rotary angle is 300 degrees, as per it's specs (0 to 300)
full_angle = 300
 
while True:
    try:
        # Read sensor value from potentiometer
        sensor_value = bakebit.analogRead(potentiometer)
 
        # Calculate voltage
        voltage = round((float)(sensor_value) * adc_ref / 1023, 2)
 
        # Calculate rotation in degrees (0 to 300)
        degrees = round((voltage * full_angle) / bakebit_vcc, 2)
 
        # Calculate LED brightess (0 to 255) from degrees (0 to 300)
        brightness = int(degrees / full_angle * 255)
 
        # Give PWM output to LED
        bakebit.analogWrite(led,brightness)
 
        print("sensor_value = %d voltage = %.2f degrees = %.1f brightness = %d" %(sensor_value, voltage, degrees, brightness))
    except KeyboardInterrupt:
        bakebit.analogWrite(led,0)
        break
    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_rotary_angle_sensor.py" program: 

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

3.4 Observation

When you rotate the rotary angle sensor module the LED’s luminance will change accordingly.

4 Code Sample(2): Servo and Rotary Angle Sensor

This code sample shows how to control a servo with the Rotary Angle Sensor module.
A BakeBit - Servo is needed in this test case. For more details about the servo module refer to the BakeBit - Servo page.

5 Code Sample(3): LED Bar and Rotary Angle Sensor

This code sample shows how to adjust sound volume with the rotary angle sensor module.
A BakeBit - LED Bar is needed in this test case. For more details about the LED Bar refer to the BakeBit - LED Bar page.

6 Resources

7 Update Log

7.1 December-13-2016

  • Released English version

7.2 Jan-19-2017

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

7.3 Jan-20-2017

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