Matrix - Relay

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Introduction

Relay
  • The Matrix-Relay module is a SPDT relay which is an electrically operated switch. Relays are used where it is necessary to control a circuit by a low-power signal. In a electric system it is used to protect electrical circuits from overload or faults.

Features

  • 1 Form C
  • 5V supply voltage, GPIO signal: 3.3/5V
  • Current on-contact up to 10A
  • LED indicator
  • 2.54 mm spacing pin
  • PCB dimension (mm): 24 x 48

继电器PCB

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

Basic Device Operation

This is an SPDT relay. Its supply voltage is 5V and current on-contact is up to 10A. It can drive AC or DC high power loads. NO is Normally Open. NC is Normally Closed. COM is Common. When writing high to pin S NO will be open and NC will be closed.

Download Matrix Source Code

All the matrix modules' code samples are open source. They are maintained on GitHub - https://github.com/friendlyarm/matrix.git
Each branch in this hub contains the matrix modules' code samples for a board that the matrix modules can work with.

  • The nanopi branch contains the matrix modules' code samples for the NanoPi
  • The tiny4412 branch contains the matrix modules' code samples for the Tiny4412
  • The raspberrypi branch contains the matrix modules' code samples for the RaspberryPi

Please follow the steps below to get the source code:
Install the git utility on a PC running Ubuntu14.04

$ sudo apt-get install git

Clone the matrix code from GitHub

$ git clone https://github.com/friendlyarm/matrix.git

If this is successful a "matrix" directory will be generated, which will contain all the matrix modules' code samples.

Connect to NanoPi

Preparations

Please install a Debian on a NanoPi and an appropriate cross compiler on a PC. Please refer to wiki:NanoPi
Compile a NanoPi kernel. Note: please use the kernel's source code from the nanopi-v4.1.y-matrix branch.

$ git clone https://github.com/friendlyarm/linux-4.x.y.git
$ cd linux-4.x.y
$ git checkout nanopi-v4.1.y-matrix
$ make nanopi_defconfig
$ touch .scmversion
$ make

Hardware Connection

Please refer to the following connection diagram to connect the Matrix-Relay to the NanoPi
matrix-relay_nanopi

Connection Details:

Matrix-LED NanoPi
S Pin7
V Pin4
G Pin6

Compile Test Program

Please login the matrix hub and enter the nanopi branch

$ cd matrix
$ git checkout nanopi

Compile the matrix code

$ make CROSS_COMPILE=arm-linux- clean
$ make CROSS_COMPILE=arm-linux-
$ make CROSS_COMPILE=arm-linux- install

Note: please make sure to install the cross compiler "arm-linux-gcc-4.4.3" on your PC, which is used to compile files for the NanoPi-Debian.
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-Relay" module is "matrix-relay".

Run Test Program

Please copy the library files and test program to the NanoPi

$ cp install/usr/bin/* nanopi_rootfs/usr/bin/
$ cp install/lib/* nanopi_rootfs/lib/ -d

Power on the NanoPi and run the following command in Debian's terminal

$ matrix-relay

Code Sample

#include <stdio.h>
#include <string.h>
#include "libfahw.h"

int main(int argc, char ** argv)
{
    char *status = "off";
    if (argc != 2) {
        printf("Set relay on\n");
    } else {
        status = argv[1];
        printf("Set relay %s\n", argv[1]);
    }

    int pin = GPIO_PIN1;
    int ret = -1;
    if ((ret = exportGPIOPin(pin)) != 0) {	
        printf("exportGPIOPin(%d) failed!", pin);
    }
    if ((ret = setGPIODirection(pin, GPIO_OUT)) != 0) {
        printf("setGPIODirection(%d) failed", pin);
    }

    if (strcmp(status, "on") == 0) {
        ret = setGPIOValue(pin, GPIO_HIGH);
    } else if (strcmp(status, "off") == 0) {
        ret = setGPIOValue(pin, GPIO_LOW);
    }
    return ret;
}

Connect to Tiny4412

Preparations

Please refer to the Tiny4412's user's manual to install a UbuntuCore on the Tiny4412 and install an appropriate cross compiler on a PC.
Note: only the Tiny4412SDK-1506 carrier board can work with this module.

Hardware Connection

Please refer to the following diagram to connect the Matrix-Relay to the Tiny4412
matrix-relay_tiny4412

Connection Details:

Matrix-LED Tiny4412
S GPIO1 S
V GPIO1 5V
G GPIO1 GND


Compile Test Program

Please login the Matrix hub and enter the matrix-tiny4412 branch

$ cd matrix
$ git checkout tiny4412

Compile the matrix code

$ make CROSS_COMPILE=arm-linux-gnueabihf- clean
$ make CROSS_COMPILE=arm-linux-gnueabihf-
$ make CROSS_COMPILE=arm-linux-gnueabihf- install

Note: please make sure to install the cross compiler "arm-linux-gnueabihf-gcc-4.7.3" on your PC, which is used to compile files for the Tiny4412-UbuntuCore.
Generated library files are under the "install/lib" directory. Applications are under the "install/usr/bin" directory. The test program for the "Matrix-Relay" module is "matrix-relay".

Run Test Program

Please copy the library files and test program to the Tiny4412

$ cp install/usr/bin/* tiny4412_rootfs/usr/bin/
$ cp install/lib/* tiny4412_rootfs/lib/ -d

Power on the Tiny4412 and run the following command in UbuntuCore's terminal

$ matrix-relay

Code Sample

#include <stdio.h>
#include <string.h>
#include "libfahw.h"

int main(int argc, char ** argv)
{
    char *status = "off";
    if (argc != 2) {
        printf("Set relay on\n");
    } else {
        status = argv[1];
        printf("Set relay %s\n", argv[1]);
    }

    int pin = GPIO_PIN1;
    int ret = -1;
    if ((ret = exportGPIOPin(pin)) != 0) {	
        printf("exportGPIOPin(%d) failed!", pin);
    }
    if ((ret = setGPIODirection(pin, GPIO_OUT)) != 0) {
        printf("setGPIODirection(%d) failed", pin);
    }

    if (strcmp(status, "on") == 0) {
        ret = setGPIOValue(pin, GPIO_HIGH);
    } else if (strcmp(status, "off") == 0) {
        ret = setGPIOValue(pin, GPIO_LOW);
    }
    return ret;
}

Connect to RaspberryPi

Connect to Arduino

Resources

DHT11.pdf