Difference between revisions of "Matrix - Potentiometer"

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−
[[Matrix - Potentiometer|English]]
+
[[Matrix - Potentiometer/zh|查看中文]]
  
−
==介绍==
+
==Introduction==
 
[[File:Potentiometer .png|thumb|Potentiometer]]
 
[[File:Potentiometer .png|thumb|Potentiometer]]
−
*Matrix-Potentiometer是一个简单的电位器模块，电位器最常见的用途是各式音响声源设备里的音量控制或电子设备里的各式准位与功率等的控制，也可以做为位置或角度的传感器，或者是作为钨丝灯泡调光器或电热丝功率调节器的控制元件等。
+
*The Matrix-Potentiometer module is a Potentiometer module. It can be used in audio control, motion control, transducers, computation and etc.
−
*引脚为3-Pin 2.54mm排针，V接电源，G接地，S信号输出模拟电压信号。您可以把S输出的电压信号通过ADC转换为数字信号。
+
*3 Pin 2.54mm spacing pin header, V is supply voltage, G is ground and S is output analog signal. Users can convert output analog signals to digital signals via ADC conversion.
−
*输出电压范围：0--Vcc
+
*Output Voltage: 0 ~ Vcc
  
−
==特性==
+
==Features==
 
* GPIO
 
* GPIO
−
* 体积小巧
+
* Small
−
* 2.54mm排针接口
+
* 2.54mm spacing pin header
−
* PCB尺寸（mm）：8x24
+
* PCB Dimension(mm): 8 x 24
 
[[File:Potentiometer.png | frameless|400px|Potentiometer_PCB]]
 
[[File:Potentiometer.png | frameless|400px|Potentiometer_PCB]]
  
−
* 引脚说明:
+
* Pin Description:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
−
|名称 || 描述
+
|Pin || Description
 
|-
 
|-
−
|S    || 模拟GPIO
+
|S    || Analog GPIO
 
|-
 
|-
−
|V    || 电源5V
+
|V    || Supply Voltage 5V
 
|-
 
|-
−
|G    || 地
+
|G    || Ground
 
|}
 
|}
  
−
==工作原理==
+
==Basic Device Operation==
−
*电位器是一种具有三个端子，其中有两个固定接点与一个滑动接点，可经由滑动而改变滑动端与两个固定端间电阻值的电子零件，属于被动元件，使用时可形成不同的分压比率，改变滑动点的电位。
+
*A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.
−
*模块主要器件是一个电位器，通过改变接入电路部分电阻线的长度来改变接入部分的电阻值，从而改变输出端的分压。
+
*This module mainly contains a potentiometer where the resistance changes with changes between the contact and one end terminal.
  
−
==下载Matrix源码==
 
−
Matrix配件相关的代码是完全开源的，统一由一个仓库进行管理：git://github.com/friendlyarm/matrix.git <br>
 
−
该仓库里不同的分支代表着Matrix配件所支持的不同开发板。<br>
 
−
* nanopi分支用于支持NanoPi；
 
−
* nanopi2分支用于支持NanoPi 2；
 
−
* tiny4412分支用于支持Tiny4412；
 
−
* raspberrypi分支用于支持RaspberryPi；
 
  
−
在主机PC上安装git，以Ubuntu14.04为例
+
==Applications==
 +
The Matrix-Potentiometer module outputs analog signals which can be converted to digital signals through an ADC converter e.g. the Matrix-Analog_to_Digital_Converter module.<br>
 +
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki:[[Matrix_-_Analog_to_Digital_Converter/zh|Matrix-Analog_to_Digital_Converter]]。<br>
 +
 
 +
===Connect to NanoPi M1===
 +
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
 +
[[File:Matrix-Potentiometer_nanopi_m1.jpg|frameless|600px|Matrix-Potentiometer_nanopi_m1]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Potentiometer ||     
 +
|-
 +
|GND    || NanoPi M1 Pin9
 +
|-
 +
|5V    || NanoPi M1 Pin2
 +
|-
 +
|S      || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 
 +
===Connect to NanoPi 2===
 +
Refer to the following connection diagram to connect the module to the NanoPi 2:<br>
 +
[[File:Matrix-Potentiometer.jpg|frameless|600px|Matrix-Potentiometer]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Potentiometer ||     
 +
|-
 +
|GND    || NanoPi 2 Pin9
 +
|-
 +
|5V    || NanoPi 2 Pin2
 +
|-
 +
|S      || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 
 +
===Connect to NanoPi M2 / NanoPi 2 Fire===
 +
Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire.<br>
 +
[[File:Matrix-Potentiometer_nanopi_m2.jpg|frameless|600px|Matrix-Potentiometer_nanopi_m2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Potentiometer ||     
 +
|-
 +
|GND    || NanoPi M2 Pin9
 +
|-
 +
|5V    || NanoPi M2 Pin2
 +
|-
 +
|S      || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 
 +
===Connect to NanoPC-T2===
 +
Refer to the following connection diagram to connect the module to the NanoPC-T2:<br>
 +
[[File:Matrix-Potentiometer_NanoPC-T2.jpg|frameless|600px|Matrix-Potentiometer_NanoPC-T2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Potentiometer ||     
 +
|-
 +
|GND    || NanoPC-T2 USB Host GND
 +
|-
 +
|5V    || NanoPC-T2 USB Host 5V
 +
|-
 +
|S      || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 
 +
==Compile & Run Test Program==
 +
Boot your ARM board with Debian and copy the matrix code:
 +
<syntaxhighlight lang="bash">
 +
$ apt-get update && apt-get install git
 +
$ git clone https://github.com/friendlyarm/matrix.git
 +
</syntaxhighlight>
 +
If your cloning is done successfully a "matrix" directory will be generated.
 +
 
 +
Compile and install Matrix:
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ make && make install
 +
</syntaxhighlight>
 +
 
 +
Run test program:
 +
<syntaxhighlight lang="bash">
 +
$ matrix-adc
 +
</syntaxhighlight>
 +
Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.<br>
 +
Here is what you should observe:<br>
 +
<syntaxhighlight lang="bash">
 +
The channel0 value is 2460
 +
</syntaxhighlight>
 +
 
 +
==Code Sample==
 +
This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-analog_to_digital_converter". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i = 0;
 +
    int value = 0;
 +
    int channel = 0;
 +
 
 +
    if (boardInit() < 0) {
 +
        printf("Fail to init board\n");
 +
        return -1;
 +
    }
 +
   
 +
    if (argc == 2)
 +
        channel = atoi(argv[1]);
 +
    system("modprobe "DRIVER_MODULE);
 +
    signal(SIGINT, intHandler);
 +
    for (i=0; i<ADC_READ_TIMES; i++) {
 +
        if (pcf8591Read(channel, &value) != -1) {
 +
            printf("The channel%d value is %d\n", channel, value);
 +
        } else {
 +
            printf("Fail to get channel%d value\n", channel);
 +
        }
 +
    }
 +
    system("rmmod "DRIVER_MODULE);
 +
   
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
For more details about this APIs called in this code sample refer to [[Matrix API reference manual]] <br>
 +
 
 +
==Resources==
 +
 
 +
<!---
 +
==Download Matrix Source Code==
 +
All the matrix modules' code samples are open source. They are maintained on GitHub :https://github.com/friendlyarm/matrix.git <br>
 +
Each branch in this hub contains the matrix modules' code samples for a board that the matrix modules can work with.<br>
 +
* The matrix-nanopi branch contains the matrix modules' code samples for the NanoPi;
 +
* The matrix-nanopi2 branch contains the matrix modules' code samples for the NanoPi 2;
 +
* The matrix-tiny4412 branch contains the matrix modules' code samples for the Tiny4412;
 +
* The matrix-raspberrypi branch contains the matrix modules' code samples for the RaspberryPi
 +
 
 +
Please follow the steps below to get the source code:<br>
 +
Install the git utility on a PC running Ubuntu14.04<br>
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ sudo apt-get install git
 
$ sudo apt-get install git
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
克隆Matrix配件代码仓库
+
Clone the matrix code from GitHub
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
−
$ git clone git://github.com/friendlyarm/matrix.git
+
$ git clone https://github.com/friendlyarm/matrix.git
 
</syntaxhighlight>
 
</syntaxhighlight>
−
克隆完成后会得到一个名为matrix的目录，里面存放着所有Matrix配件的代码。
+
If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.<br>
  
−
==与NanoPi 2连接使用==
+
==Connect to NanoPi 2==
−
===硬件连接===
+
===Hardware Connection===
−
参考下图连接模块Matrix-Potentiometer和NanoPi 2：<br>
+
Please refer to the following connection diagram to connect the Matrix-Potentiometer to the NanoPi 2:<br>
 
[[File:Matrix-Potentiometer.jpg|frameless|600px|Matrix-Potentiometer]]
 
[[File:Matrix-Potentiometer.jpg|frameless|600px|Matrix-Potentiometer]]
  
−
连接说明：
+
Connection Details:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
−
|Matrix-Photoresistor ||      
+
|Matrix-Analog_to_Digital_Converter || NanoPi 2     
 
|-
 
|-
−
|GND    || NanoPi 2 Pin14
+
|SDA    || Pin3
 +
|-
 +
|SCL    || Pin5
 +
|-
 +
|5V    || Pin4
 +
|-
 +
|GND    || Pin6
 +
|}
 +
 
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Potentiometer ||     
 +
|-
 +
|GND    || NanoPi 2 Pin9
 
|-
 
|-
 
|5V    || NanoPi 2 Pin2
 
|5V    || NanoPi 2 Pin2
Line 65: Line 207:
 
|S      || Matrix-Analog_to_Digital_Converter A0
 
|S      || Matrix-Analog_to_Digital_Converter A0
 
|}
 
|}
 +
This module's output signals are analog signals. You can use our Matrix-Analog_to_Digital_Converter to convert them to digital signals.<br>
 +
Please connect the Matrix-Analog_to_Digital_Converter to the NanoPi 2 and then connect Pin S of the Matrix-Photoresistor's pin header to Matrix-Analog_to_Digital_Converter's A0.<br>
 +
For more details about the Matrix-Analog_to_Digital_Converter module please refer to wiki: [[Matrix_-_Analog_to_Digital_Converter]].<br>
  
−
* Matrix - Potentiometer 模块的使用，直接运行Matrix-Potentiometer模块的demo即可。
+
===Compile Test Program===
−
 
+
Please login the matrix hub and enter the nanopi2 branch
−
===编译测试程序===
+
−
进入Matrix代码仓库，切换到nanopi2分支
+
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cd matrix
 
$ cd matrix
Line 75: Line 218:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
编译Matrix配件代码
+
Compile the Matrix code
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ make CROSS_COMPILE=arm-linux- clean
 
$ make CROSS_COMPILE=arm-linux- clean
Line 81: Line 224:
 
$ make CROSS_COMPILE=arm-linux- install
 
$ make CROSS_COMPILE=arm-linux- install
 
</syntaxhighlight>
 
</syntaxhighlight>
−
注意：请确保你的主机PC当前使用的交叉编译器为NanoPi 2配套的arm-linux-gcc-4.9.3。<br>
+
Note: please make sure to install the cross compiler "arm-linux-gcc-4.9.3" on your PC, which is used to compile files for the NanoPi 2.<br>
−
编译成功后库文件位于install/lib目录下，而测试程序则位于install/usr/bin目录下，模块Matrix-Analog_to_Digital_Converter对应的测试程序为matrix-adc。<br>
+
Generated library files are under the "install/lib" directory. The test program is under the "install/usr/bin" directory. Its test program is "matrix-adc".<br>
 +
The modules are under the "modules" directory. Its driver's source code is in https://github.com/friendlyarm/linux-3.4.y.git <br>
  
−
===运行测试程序===
+
===Run Test Program===
−
将带有Debian系统的SD卡插入一台运行Linux的电脑，可以挂载SD卡上的boot和rootfs分区。<br>
+
Please insert a TF card which is flashed with Debian to a Linux host and mount its boot and rootfs sections.<br>
−
假设rootfs分区的挂载路径为/media/rootfs，执行以下命令将Matrix的硬件驱动、库文件和测试程序拷贝到NanoPi 2的文件系统上。<br>
+
We assume the rootfs is mounted to /media/rootfs then please run the following commands to copy the driver, library and test program to the card.<br>
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cp modules /media/rootfs/ -r
 
$ cp modules /media/rootfs/ -r
Line 93: Line 237:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
将SD卡重新插入NanoPi 2，上电启动，在Debian的shell终端中执行以下命令加载硬件驱动。<br>
+
Insert this TF card to your NanoPi 2, power on and run the following commands to load the driver.<br>
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cd /modules
 
$ cd /modules
Line 99: Line 243:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
−
运行模块Matrix-Potentiometer 的测试程序。<br>
+
Please run the following command to test the Matrix-Potentiometer module.<br>
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ matrix-adc
 
$ matrix-adc
 
</syntaxhighlight>
 
</syntaxhighlight>
−
运行效果如下：<br>
+
Here is what you should expect:<br>
−
[[File:matrix-Potentiometer _result.png|frameless||matrix-Potentiometer _result]] <br>
+
[[File:matrix-adc_result.png|frameless||matrix-adc_result]] <br>
  
−
===代码展示===
+
===Code Sample===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
int main(int argc, char ** argv)
 
int main(int argc, char ** argv)
Line 129: Line 273:
 
}
 
}
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
--->
 +
 +
==Update Log==
 +
===Feb-24-2016===
 +
* Added link to the Chinese version
 +
===June-23-2016===
 +
* Re-organized and simplified wiki

Latest revision as of 14:27, 23 June 2016

查看中文

1 Introduction

Potentiometer
  • The Matrix-Potentiometer module is a Potentiometer module. It can be used in audio control, motion control, transducers, computation and etc.
  • 3 Pin 2.54mm spacing pin header, V is supply voltage, G is ground and S is output analog signal. Users can convert output analog signals to digital signals via ADC conversion.
  • Output Voltage: 0 ~ Vcc

2 Features

  • GPIO
  • Small
  • 2.54mm spacing pin header
  • PCB Dimension(mm): 8 x 24

Potentiometer_PCB

  • Pin Description:
Pin Description
S Analog GPIO
V Supply Voltage 5V
G Ground

3 Basic Device Operation

  • A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.
  • This module mainly contains a potentiometer where the resistance changes with changes between the contact and one end terminal.


4 Applications

The Matrix-Potentiometer module outputs analog signals which can be converted to digital signals through an ADC converter e.g. the Matrix-Analog_to_Digital_Converter module.
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki:Matrix-Analog_to_Digital_Converter。

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-Potentiometer_nanopi_m1

Connection Details:

Matrix-Potentiometer
GND NanoPi M1 Pin9
5V NanoPi M1 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-Potentiometer

Connection Details:

Matrix-Potentiometer
GND NanoPi 2 Pin9
5V NanoPi 2 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.3 Connect to NanoPi M2 / NanoPi 2 Fire

Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire.
Matrix-Potentiometer_nanopi_m2

Connection Details:

Matrix-Potentiometer
GND NanoPi M2 Pin9
5V NanoPi M2 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.4 Connect to NanoPC-T2

Refer to the following connection diagram to connect the module to the NanoPC-T2:
Matrix-Potentiometer_NanoPC-T2

Connection Details:

Matrix-Potentiometer
GND NanoPC-T2 USB Host GND
5V NanoPC-T2 USB Host 5V
S Matrix-Analog_to_Digital_Converter A0

5 Compile & Run Test Program

Boot your ARM board with Debian and copy the matrix code: 

$ apt-get update && apt-get install git
$ git clone https://github.com/friendlyarm/matrix.git

If your cloning is done successfully a "matrix" directory will be generated.

Compile and install Matrix: 

$ cd matrix
$ make && make install

Run test program: 

$ matrix-adc

Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.
Here is what you should observe:

The channel0 value is 2460

6 Code Sample

This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-analog_to_digital_converter". Here is its source code: 

int main(int argc, char ** argv)
{
    int i = 0;
    int value = 0;
    int channel = 0;
 
    if (boardInit() < 0) {
        printf("Fail to init board\n");
        return -1;
    }
 
    if (argc == 2)
        channel = atoi(argv[1]);
    system("modprobe "DRIVER_MODULE);
    signal(SIGINT, intHandler);
    for (i=0; i<ADC_READ_TIMES; i++) {
        if (pcf8591Read(channel, &value) != -1) {
            printf("The channel%d value is %d\n", channel, value);
        } else {
            printf("Fail to get channel%d value\n", channel);
        }
    }
    system("rmmod "DRIVER_MODULE);
 
    return 0;
}

For more details about this APIs called in this code sample refer to Matrix API reference manual

7 Resources

8 Update Log

8.1 Feb-24-2016

  • Added link to the Chinese version

8.2 June-23-2016

  • Re-organized and simplified wiki
Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=Matrix_-_Potentiometer&oldid=6233"