Matrix - Rotary Encoder

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Introduction

Features

File:Matrix-Rotary Encoder PCB.png

  • Pin Description:
Pin Description

Basic Device Operation

Applications

Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-Rotary_Encoder_nanopi_m1

Connection Details:

Matrix-Rotary_Encoder NanoPi M1
R Pin7
G Pin8
B Pin10
V Pin4
G Pin6

Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-Rotary_Encoder_nanopi_2

Connection Details:

Matrix-Rotary_Encoder NanoPi 2
R Pin7
G Pin8
B Pin10
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:
Matrix-Rotary_Encoder_nanopi_m2

Connection Details:

Matrix-Rotary_Encoder NanoPi M2
R Pin7
G Pin8
B Pin10
V Pin4
G Pin6

Connect to NanoPC-T2

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

Connection Details:

Matrix-Rotary_Encoder NanoPC-T2
R Pin15
G Pin16
B Pin17
V Pin29
G Pin30

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-rotary_encoder

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:

Get sw=0 value=1
Get sw=0 value=2
Get sw=0 value=3
Get sw=0 value=4
Get sw=0 value=5

Rotating this module will trigger events and generate values.

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-rotary_encoder". Here is its source code:

int main(int argc, char ** argv) 
{ 
    int i = 0;
    int encoderSw = 0;
    int encoderValue = 0;
    int board;
    int swPin = GPIO_PIN(7);
    int siaPin = GPIO_PIN(8);
    int sibPin = GPIO_PIN(10);
 
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
    if (board == BOARD_NANOPI_T2) {
        swPin = GPIO_PIN(15);
        siaPin = GPIO_PIN(16);
        sibPin = GPIO_PIN(17);
    }
    system("modprobe "DRIVER_MODULE);
    if (rotaryEncoderInit(swPin, siaPin, sibPin)) {
        printf("Fail to init rotary encoder\n");
        goto err;
    }
    signal(SIGINT, encoderHandler);
    for (i=0; i<ENCODER_READ_TIMES; i++) {
        rotaryEncoderRead(ENCODER_SW, &encoderSw);
        rotaryEncoderRead(ENCODER_VALUE, &encoderValue);
        printf("Get sw=%d value=%d\n", encoderSw, encoderValue);
        sleep(1);
    }
    rotaryEncoderDeInit();
err:
    system("rmmod "DRIVER_MODULE);
    return 0;
}

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

Resources

Update Log

June-24-2016

  • Created English wiki