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Revision as of 22:00, 5 February 2016
Contents
Introduction
- 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
- 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
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
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;
}