Difference between revisions of "Matrix - Ball Rolling Switch"

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*The Matrix-Ball_Rolling_Switch module is a ball switch. Its electrical characteristics are very similar to a mercury switch's however a mercury switch is easily broken, oxidized, leaking and not environment-friendly. This ball switch prevents all these issues.
 
*The Matrix-Ball_Rolling_Switch module is a ball switch. Its electrical characteristics are very similar to a mercury switch's however a mercury switch is easily broken, oxidized, leaking and not environment-friendly. This ball switch prevents all these issues.
 
*The switch is free to move any angle and if that angle is between 15 degrees and 45 degrees a signal will be generated and used as an input to a Schmitt trigger.   
 
*The switch is free to move any angle and if that angle is between 15 degrees and 45 degrees a signal will be generated and used as an input to a Schmitt trigger.   
−
 
  
 
==Features==
 
==Features==
Line 27: Line 26:
  
 
==Basic Device Operation==
 
==Basic Device Operation==
−
3-Pin 2.54mm排针，V接电源，G接地，S为模块数字信号输出，当开关倾斜，开关内的金属球珠滚动到开关一侧，导通触点时，开关输出高电平到施密特触发器，再通过触发器内部的逆变器反向，模块输出低电平；当开关内的金属球珠滚动到开关的另一侧，断开触点时，滚珠开关输出低电平到施密特触发器，触发器内部的逆变器反向，此时，模块输出高电平。
+
Please connect Pin V to a power supply, Pin G grounded and Pin S to a digital output. When you move the switch pushing the internal metal ball to connect the trigger point a high level signal will be generated and output to a Schmitt trigger which reverses this signal to output a low level signal. When you move the switch pushing the internal metal ball away from the trigger point a low level signal will be generated and output to a Schmitt trigger which reverses this signal to output a high level signal.
  
−
==下载Matrix源码==
+
==Applications==
−
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>
+
===Connect to NanoPi M1===
−
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>
+
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
−
* nanopi分支用于支持NanoPi；
+
[[File:Matrix-Ball_Rolling_Switch_nanopi_m1.jpg|frameless|600px|matrix-BAll_Rolling_Switch_nanopi_m1]]
−
* 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
+
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Ball_Rolling_Switch || NanoPi M1
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 
 +
===Connect to NanoPi 2===
 +
Refer to the following connection diagram to connect the module to the NanoPi 2:<br>
 +
[[File:matrix-BAll Rolling Switch_nanopi.jpg|frameless|600px|matrix-BAll Rolling Switch_nanopi2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Ball_Rolling_Switch || NanoPi 2
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 
 +
===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-Ball_Rolling_Switch_nanopi_m2.jpg|frameless|600px|Matrix-Ball_Rolling_Switch_nanopi_m2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Ball_Rolling_Switch || NanoPi M2
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 
 +
===Connect to NanoPC-T2===
 +
Refer to the following connection diagram to connect the module to the NanoPC-T2:<br>
 +
[[File:Matrix-Ball_Rolling_Switch_NanoPC-T2.jpg|frameless|600px|Matrix-Ball_Rolling_Switch_NanoPC-T2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Ball_Rolling_Switch || NanoPC-T2
 +
|-
 +
|S    || Pin15
 +
|-
 +
|V    || Pin29
 +
|-
 +
|G    || Pin30
 +
|}
 +
 
 +
==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-gpio_int
 +
</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">
 +
Waiting event...
 +
Device[0] value is 1
 +
</syntaxhighlight>
 +
When you tilt the module, roll the ball and make it touch the trigger point you will see an event is detected.
 +
 
 +
==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-gpio_int". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i, board;
 +
    int retSize = -1;
 +
    char value[ARRAY_SIZE(dev)];
 +
 
 +
    if ((board = boardInit()) < 0)
 +
        printf("Fail to init board\n");
 +
   
 +
    if (argc == 2) {
 +
        dev[0].pin = atoi(argv[1]);
 +
    }
 +
    printf("Using GPIO_PIN(%d)\n", dev[0].pin);
 +
    system("modprobe "DRIVER_MODULE);
 +
    signal(SIGINT, intHandler);
 +
    if (board == BOARD_NANOPI_T2)
 +
        dev[0].pin = GPIO_PIN(15);
 +
    if ((devFD =sensorInit(dev, ARRAY_SIZE(dev))) == -1) {
 +
        printf("Fail to init sensor\n");
 +
        return -1;
 +
    }
 +
    printf("Waiting event...\n");
 +
    if ((retSize = sensorRead(devFD, value, ARRAY_SIZE(dev))) == -1) {
 +
        printf("Fail to read sensors\n");
 +
    }
 +
    if (retSize > 0) {
 +
        i = 0;
 +
        for (i=0; i<retSize; i++) {
 +
            printf("dev[%d] value: %d\n", i, value[i]);
 +
        }
 +
    }
 +
    sensorDeinit(devFD);
 +
    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==
 +
*[Schematic]([http://wiki.friendlyarm.com/wiki/images/0/00/TIL-01-1511-Schematic.pdf Matrix - Ball Rolling Switch-Schematic.pdf])
 +
 
 +
<!---
 +
==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
 
<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.
  
−
==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-Ball_Rolling_Switch和NanoPi2：<br>
+
Please refer to the following connection diagram to connect the Matrix-Ball_Rolling_Switch to the NanoPi 2:<br>
 
[[File:matrix-BAll Rolling Switch_nanopi.jpg|frameless|600px|matrix-BAll Rolling Switch_nanopi2]]
 
[[File:matrix-BAll Rolling Switch_nanopi.jpg|frameless|600px|matrix-BAll Rolling Switch_nanopi2]]
  
−
连接说明：
+
Connection Details:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
Line 65: Line 201:
 
|}
 
|}
  
−
===编译测试程序===
+
===Compile Test Program===
−
进入Matrix代码仓库，切换到nanopi2分支
+
Please login the matrix hub and enter the nanopi2 branch
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ cd matrix
 
$ cd matrix
Line 72: Line 208:
 
</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 78: Line 214:
 
$ 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-Ball_Rolling_Switch对应的测试程序为matrix-ball_switch。<br>
+
Generated library files are under the "install/lib" directory. The test program is under the "install/usr/bin" directory.<br>
 +
The modules are under the "modules" directory. The driver's source code is in github: 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 module, 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 90: Line 227:
 
</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运行模块Matrix-Ball_Rolling_Switch的测试程序。<br>
+
Insert this TF card to your NanoPi 2, power on and run the following commands to start the matrix-ball_switch program.<br>
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
$ matrix-ball_switch
 
$ matrix-ball_switch
 
</syntaxhighlight>
 
</syntaxhighlight>
−
运行效果如下：<br>
+
Here is what you should expect:<br>
 
[[File:matrix-ball_switch_result.png|frameless|600px|matrix-ball_switch_result]] <br>
 
[[File:matrix-ball_switch_result.png|frameless|600px|matrix-ball_switch_result]] <br>
−
将模块竖立起来，利用开关中的小珠的滚动，制造与金属端子的触碰或改变光线行进的路线，就能产生导通的效果。
+
After you get the prompt "Lean the switch" please tilt the module to roll the ball making it touch the trigger point you will see "Switch[0]:1".
  
−
===代码展示===
+
===Code Sample===
 
<syntaxhighlight lang="c">
 
<syntaxhighlight lang="c">
 
static struct sensor brSwitch[] = {
 
static struct sensor brSwitch[] = {
Line 137: Line 274:
 
}
 
}
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
--->
 +
 +
==Update Log==
 +
===Feb-24-2016===
 +
* Added the driver's source code location in Section 5.2
 +
===June-17-2016===
 +
* Re-organized and simplified wiki

Latest revision as of 10:30, 19 June 2016

查看中文

1 Introduction

BAll Rolling Switch
  • The Matrix-Ball_Rolling_Switch module is a ball switch. Its electrical characteristics are very similar to a mercury switch's however a mercury switch is easily broken, oxidized, leaking and not environment-friendly. This ball switch prevents all these issues.
  • The switch is free to move any angle and if that angle is between 15 degrees and 45 degrees a signal will be generated and used as an input to a Schmitt trigger.

2 Features

  • GPIO
  • Small
  • 2.54 mm spacing pin header
  • PCB Dimension(mm):16 x 16

BAll Rolling Switch-01.PCB

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

3 Basic Device Operation

Please connect Pin V to a power supply, Pin G grounded and Pin S to a digital output. When you move the switch pushing the internal metal ball to connect the trigger point a high level signal will be generated and output to a Schmitt trigger which reverses this signal to output a low level signal. When you move the switch pushing the internal metal ball away from the trigger point a low level signal will be generated and output to a Schmitt trigger which reverses this signal to output a high level signal.

4 Applications

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
matrix-BAll_Rolling_Switch_nanopi_m1

Connection Details:

Matrix-Ball_Rolling_Switch NanoPi M1
S Pin7
V Pin4
G Pin6

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
matrix-BAll Rolling Switch_nanopi2

Connection Details:

Matrix-Ball_Rolling_Switch NanoPi 2
S Pin7
V Pin4
G Pin6

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-Ball_Rolling_Switch_nanopi_m2

Connection Details:

Matrix-Ball_Rolling_Switch NanoPi M2
S Pin7
V Pin4
G Pin6

4.4 Connect to NanoPC-T2

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

Connection Details:

Matrix-Ball_Rolling_Switch NanoPC-T2
S Pin15
V Pin29
G Pin30

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-gpio_int

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:

Waiting event...
Device[0] value is 1

When you tilt the module, roll the ball and make it touch the trigger point you will see an event is detected.

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-gpio_int". Here is its source code: 

int main(int argc, char ** argv)
{
    int i, board;
    int retSize = -1;
    char value[ARRAY_SIZE(dev)];
 
    if ((board = boardInit()) < 0)
        printf("Fail to init board\n");
 
    if (argc == 2) {
        dev[0].pin = atoi(argv[1]);
    }
    printf("Using GPIO_PIN(%d)\n", dev[0].pin);
    system("modprobe "DRIVER_MODULE);
    signal(SIGINT, intHandler);
    if (board == BOARD_NANOPI_T2)
        dev[0].pin = GPIO_PIN(15);
    if ((devFD =sensorInit(dev, ARRAY_SIZE(dev))) == -1) {
        printf("Fail to init sensor\n");
        return -1;
    }
    printf("Waiting event...\n");
    if ((retSize = sensorRead(devFD, value, ARRAY_SIZE(dev))) == -1) {
        printf("Fail to read sensors\n");
    }
    if (retSize > 0) {
        i = 0;
        for (i=0; i<retSize; i++) {
            printf("dev[%d] value: %d\n", i, value[i]);
        }
    }
    sensorDeinit(devFD);
    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 the driver's source code location in Section 5.2

8.2 June-17-2016

  • Re-organized and simplified wiki
Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=Matrix_-_Ball_Rolling_Switch&oldid=6107"