Raspberry PI

Raspberry PI (23)

Wednesday, 17 September 2014 10:36

Raspberry Pi LCD 16x2 Display

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1. Raspberry Pi
2. 16x2 LCD display 202A-D REV.A
3. Cables
4. Recommend install Raspbian






Pictures on Display









Upgrade distribute (required for RPi.GPIO 0.3.1a) 
$ sudo apt-get install python-dev
$ sudo apt-get install python-setuptools
$ sudo apt-get install unzip
Download and test display
$ unzip KMTronic_CharLCD.zip
$ chmod +x KMTronic_CharLCD.py
$ sudo KMTronic_CharLCD.py
You can test the wiring from the previous step by simply running the KMTronic_CharLCD.py
python code, as it has a little code it in that will simply display a test message when wired
If you're using a Version 2 Raspberry Pi, pin #21 has been replaced with pin #27 so edit
KMTronic_CharLCD.py and change:
def __init__(self, pin_rs=25, pin_e=24, pins_db=[23, 17, 21, 22], GPIO = None):
def __init__(self, pin_rs=25, pin_e=24, pins_db=[23, 17, 27, 22], GPIO = None):


Monday, 15 September 2014 08:11

Raspberry Pi How to install Web Server

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  1. 1
    Because you are running a fresh version of Raspberry PI (Raspbian) , you will need to do some housecleaning, updating, and installing. First, we are going to update the clock, update our sources, then upgrade any pre-installed packages. Type the following at the command line (press return/enter after each line):
    sudo dpkg-reconfigure tzdata
    sudo apt-get update
    sudo apt-get upgrade
  1. 2
    Set the date and time. From the command line type (replace parts as necessary):
    sudo date --set="15 September 2014 11:13:00"
  1. 3
    To install Apache and PHP, execute the following commands:
    sudo apt-get install apache2 php5 libapache2-mod-php5
  1. 4
    Now restart the service:
    sudo service apache2 restart

    sudo /etc/init.d/apache2 restart
  1. 5
    To install MySQL, install a few packages with the following command:
    sudo apt-get install mysql-server mysql-client php5-mysql
  1. 6
    We will now install FTP to allow transferring files to and from your Raspberry Pi.
  2. 7
    Take ownership of the web root:
    sudo chown -R pi /var/www
  3. 8
    Next, install vsftpd:
    sudo apt-get install vsftpd
  4. 9
    Edit your vsftpd.conf file:
    sudo nano /etc/vsftpd.conf
  5. 10
    Make the following changes:
    • anonymous_enable=YES to anonymous_enable=NO
    • Uncomment local_enable=YES and write_enable=YES by deleting the #symbol in front of each line
    • then go to the bottom of the file and add force_dot_files=YES.
  6. 11
    Now save and exit the file by pressing CTRL-O, CTRL-X.
  7. 12
    Now restart vsftpd:
    sudo service vsftpd restart
  8. 13
    Create a shortcut from the Pi user's home folder to /var/www:
    ln -s /var/www/ ~/www
  9. 14
    You can now FTP using the Pi user and access the /var/www folder via a shortcut that should appear on login.
Monday, 15 September 2014 08:10

Raspberry Pi Web Control Relay

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1 RaspberryPI
1 USB 485 Relay (for test)
USB cable
Web Server
recommend install Raspbian
Install KMTronic Web Interface 
 $ wget http://info.kmtronic.com/software/Raspberry_PI/KMTronic_WEB_Control_Relay_0.1v.zip
$ cd /var/www/
$ unzip KMTronic_WEB_Control_Relay_0.1v.zip
$ chmod +x on.sh
$ chmod +x off.sh
Set Permissions on usbtty0
$chmod -R 777 /dev/ttyUSB0
Web interface
Mobile Interface
Friday, 12 September 2014 07:57

Raspberry Pi RS232 8 Relay Board

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Now I'll show you a very easy way how to control RS232 8 relays

with the help of Raspberry PI 


1 RaspberryPI 

1 RS232 KMTronic 8 Relay Board

1 USB cable 

1 FTDI KMTronic
1 RS232 to TTL converter with MAX232
2 DB9 RS232 Male
12-volt power
recommend install Raspbian
DB9 RS232 Male to Male
FTDI to RS232 to TTL converter with MAX232


Sets baud rate of the USB relay
stty -F /dev/ttyUSB0 9600
How to switch on or off the relays
Shell code
# sends on signal to the USB relay
echo -e "\xFF\x01\x01" > /dev/ttyUSB0   -----> ON 
echo -e "\xFF\x01\x00" > /dev/ttyUSB0   -----> OFF
Monday, 25 August 2014 11:51

USB RS485 8 Relay boards by Raspberry Pi

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Now I'll show you a very easy way how to control 32 relays with the help of Raspberry PI with web Interface
1 RaspberryPI
KMTronic RS485 8 Relay Boards
KMTronic USB<>RS485 adapter
1 USB cable 
12 volt power
recommend install Raspbian







Commands for control shell script of the relays:

echo -e "\xFF\x01\x01" > /dev/ttyUSB0  -> For ON Relay 1
echo -e "\xFF\x01\x00" > /dev/ttyUSB0  -> For OFF Relay 1
echo -e "\xFF\x02\x01" > /dev/ttyUSB0  -> For ON Relay 2
echo -e "\xFF\x02\x00" > /dev/ttyUSB0  -> For OFF Relay 2
echo -e "\xFF\x03\x01" > /dev/ttyUSB0  -> For ON Relay 3
echo -e "\xFF\x03\x00" > /dev/ttyUSB0  -> For OFF Relay 3    
and etc..





Web interface



For full shell scrip download this  Download


Download web interface -Download




Thursday, 21 August 2014 13:30

How to connect RaspberryPI camera

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1 RaspberryPI
1 Raspberry PI Camera
recommend install Raspbian
Open the raspi-config tool from the Terminal:
Interminal :
sudo raspi-config
Select Enable camera and hit Enter, then go to Finish and you'll be prompted to reboot.
With the camera module connected and enabled, enter the following command in the Terminal to take a picture:
raspistill -o cam.jpg
In this example the camera has been positioned upside-down. If the camera is placed in this position, the image must be flipped to appear the right way up.
With the camera placed upside-down, the image must be rotated 180° to be displayed correctly. The way to correct for this is to apply both a vertical and a horizontal flip by passing in the -vf and -hf flags:
raspistill -vf -hf -o cam2.jpg
Vertical and horizontal flipped photo
Now the photo has been captured correctly.
The camera module takes pictures at a resolution of 2592 x 1944 which is 5,038,848 pixels or 5 megapixels.
A photo taken with the camera module will be around 2.4MB. This is about 425 photos per GB.
Taking 1 photo per minute would take up 1GB in about 7 hours. This is a rate of about 144MB per hour or 3.3GB per day.
You can create a Bash script which takes a picture with the camera. To create a script, open up your editor of choice and write the following example code:
DATE=$(date +"%Y-%m-%d_%H%M")
raspistill -vf -hf -o /home/pi/camera/$DATE.jpg
This script will take a picture and name the file with a timestamp.
You'll also need to make sure the path exists by creating the camera folder:
mkdir camera
Say we saved it as camera.sh, we would first make the file executable:
chmod +x camera.sh
Then run with:
For a full list of possible options, run raspistill with no arguments. To scroll, redirect stderr to stdout and pipe the output to less:
raspistill 2>&1 | less
Use the arrow keys to scroll and type q to exit.


Thursday, 21 August 2014 08:59

Raspberry PI USB DS18B20

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1 RaspberryPI
1 USB<>DS18B20
recommend install Raspbian
In terminal 
In web browser
C code
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
int main(int argc, char* argv[]) {
    struct termios serial;
    char inBuff[100];
    char logBuff[100];
    char *buffer;
    char *logPtr;
    int wcount = 0;
    int j;
    int fd = open("/dev/ttyACM0", O_RDWR | O_NOCTTY | O_NDELAY);
    FILE *log;
    //log = fopen("log.txt","w");
    if (fd == -1) {
        return -1;
    if (tcgetattr(fd, &serial) < 0) {
        perror("Getting configuration");
        return -1;
    //////////////////// Set up Serial Configuration ////////////
    serial.c_iflag = 0;
    serial.c_oflag = 0;
    serial.c_lflag = 0;
    serial.c_cflag = 0;
    serial.c_cc[VMIN] = 0;
    serial.c_cc[VTIME] = 10;
    serial.c_cflag = B9600 | CS8 | CREAD;
    tcsetattr(fd, TCSANOW, &serial); // Apply configuration
   int rcount;  
   buffer = &inBuff[0];
   logPtr = &logBuff[0];
   buffer = &inBuff[0];
   logPtr = &logBuff[0];
while( (rcount = read(fd,buffer,1)) > 0)
    if (rcount < 0) {
        return -1;
if(inBuff[j] == '+') {
while(inBuff[j++] != '\r'){
*logPtr = inBuff[j-1];logPtr++;
*logPtr = '\r';logPtr++;
                        *logPtr = '\n';logPtr++;
log = fopen("log.txt","w");
create log.txt file and set chmod -R 777 /path/to/file.log to folder
PHP Script
$handle = @fopen("log.txt", "r");
if ($handle) {
    while (($buffer = fgets($handle, 4096)) !== false) {
        echo $buffer;
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail\n";
Wednesday, 20 August 2014 13:13

How to Compiling C and C++ Programs

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Compiling C and C++ Programs

gcc is the "GNU" C Compiler, and g++ is the "GNU C++ compiler, while cc and CC are the Sun C and C++ compilers also available on Sun workstations. Below are several examples that show how to use g++ to compile C++ programs, although much of the information applies to C programs as well as compiling with the other compilers.

Example 1: Compiling a simple program

Consider the following example: Let "hello.C" be a file that contains the following C++ code.
  #include "iostream.h"
  int main() 
    cout << "Hello\n";
The standard way to compile this program is with the command
  g++ hello.C -o hello 

This command compiles hello.C into an executable program named "hello" that you run by typing 'hello' at the command line. It does nothing more than print the word "hello" on the screen.

Alternatively, the above program could be compiled using the following two commands.
  g++ -c hello.C
  g++ hello.o -o hello 

The end result is the same, but this two-step method first compiles hello.C into a machine code file named "hello.o" and then links hello.o with some system libraries to produce the final program "hello". In fact the first method also does this two-stage process of compiling and linking, but the stages are done transparently, and the intermediate file "hello.o" is deleted in the process.

Frequently used compilation options

C and C++ compilers allow for many options for how to compile a program, and the examples below demonstrate how to use many of the more commonly used options. In each example, "myprog.C" contains C++ source code for the executable "myprog". In most cases options can be combined, although it is generally not useful to use "debugging" and "optimization" options together.

Compile myprog.C so that myprog contains symbolic information that enables it to be debugged with the gdb debugger.
g++ -g myprog.C -o myprog
Have the compiler generate many warnings about syntactically correct but questionable looking code. It is good practice to always use this option with gcc and g++.
g++ -Wall myprog.C -o myprog
Generate symbolic information for gdb and many warning messages.
g++ -g -Wall myprog.C -o myprog
Generate optimized code on a Solaris machine with warnings. The -O is a capital o and not the number 0!
g++ -Wall -O -mv8 myprog.C -o myprog
Generate optimized code on a Solaris machine using Sun's own CC compiler. This code will generally be faster than g++ optimized code.
CC -fast myprog.C -o myprog
Generate optimized code on a Linux machine.
g++ -O myprog.C -o myprog
Compile myprog.C when it contains Xlib graphics routines.
g++ myprog.C -o myprog -lX11
If "myprog.c" is a C program, then the above commands will all work by replacing g++ with gcc and "myprog.C" with "myprog.c". Below are a few examples that apply only to C programs.
Compile a C program that uses math functions such as "sqrt".
gcc myprog.C -o myprog -lm
Compile a C program with the "electric fence" library. This library, available on all the Linux machines, causes many incorrectly written programs to crash as soon as an error occurs. It is useful for debugging as the error location can be quickly determined using gdb. However, it should only be used for debugging as the executable myprog will be much slower and use much more memory than usual.
gcc -g myprog.C -o myprog -lefence

Example 2: Compiling a program with multiple source files

If the source code is in several files, say "file1.C" and "file2.C", then they can be compiled into an executable program named "myprog" using the following command:
  g++ file1.C file2.C -o myprog 
The same result can be achieved using the following three commands:
  g++ -c file1.C
  g++ -c file2.C
  g++ file1.o file2.o -o myprog 
The advantage of the second method is that it compiles each of the source files separately. If, for instance, the above commands were used to create "myprog", and "file1.C" was subsequently modified, then the following commands would correctly update "myprog".
  g++ -c file1.C
  g++ file1.o file2.o -o myprog 
Note that file2.C does not need to be recompiled, so the time required to rebuild myprog is shorter than if the first method for compiling myprog were used. When there are numerous source file, and a change is only made to one of them, the time savings can be significant. This process, though somewhat complicated, is generally handled automatically by a makefile.
Monday, 18 August 2014 07:06

Control DMX512 devices via Raspberry PI

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1 RaspberryPI
1 Moving Head Baby LED
1 DMX512
1 USB cable
1 JoyStick Dilong
recommend install Raspbian








FTDI lib installation guide


D2XX for Linux
As Linux distributions vary these instructions are a guide to installation 
and use.  FTDI has tested the driver and samples with Ubuntu 12.04 (kernel 
version 3.2) for i386 and x86_64, and Debian 6 'squeeze' (kernel version 
2.6.32) for arm926.
FTDI developed libftd2xx primarily to aid porting Windows applications 
written with D2XX to Linux.  We intend the APIs to behave the same on
Windows and Linux so if you notice any differences, please contact us 
(see http://www.ftdichip.com/FTSupport.htm).
FTDI do not release the source code for libftd2xx.  If you prefer to work
with source code and are starting a project from scratch, consider using
the open-source libFTDI.
libftd2xx uses an unmodified version of libusb 
(http://sourceforge.net/projects/libusb/).  Source code for libusb is 
included in the driver distribution.
Installing the D2XX shared library and static library.
1.  tar xfvz libftd2xx1.1.12.tar.gz
This unpacks the archive, creating the following directory structure:
2.  cd build/arm926
3.  sudo -s 
  or, if sudo is not available on your system: 
Promotes you to super-user, with installation privileges.  If you're
already root, then step 3 (and step 7) is not necessary.
4.  cp lib* /usr/local/lib
Copies the libraries to a central location.
5.  chmod 0755 /usr/local/lib/libftd2xx.so.1.1.12
Allows non-root access to the shared object.
6.  ln -sf /usr/local/lib/libftd2xx.so.1.1.12 /usr/local/lib/libftd2xx.so
Creates a symbolic link to the 1.1.12 version of the shared object.
7.  exit
Ends your super-user session.
Building the shared-object examples.
1.  cd examples
2.  make -B
This builds all the shared-object examples in subdirectories.
With an FTDI device connected to a USB port, try one of the 
examples, e.g. reading EEPROM.
3.  cd EEPROM/read
4.  sudo ./read
If the message "FT_Open failed" appears:
    Perhaps the kernel automatically loaded another driver for the 
    FTDI USB device.
    sudo lsmod
    If "ftdi_sio" is listed:
        Unload it (and its helper module, usbserial), as follows.
        sudo rmmod ftdi_sio
        sudo rmmod usbserial
    Otherwise, it's possible that libftd2xx does not recognise your 
    device's Vendor and Product Identifiers.  Call FT_SetVIDPID before
    calling FT_Open/FT_OpenEx/FT_ListDevices.
Building the static-library example.
1.  cd examples/static
2.  rm lib*
Cleans out any existing libraries built for another target.
3.  cp /usr/local/lib/libftd2xx.a .
4.  make -B
5.  sudo ./static_link
This example demonstrates writing to, and reading from, a device with a loop-back connector attached.
The examples show how to call a small subset of the D2XX API.  The full API is available here:







#//sudo lsmod
sudo rmmod ftdi_sio
sudo rmmod usbserial
gcc -o dmx512 dmx512.c -L. -lftd2xx -Wl,-rpath /usr/local/lib




#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../ftd2xx.h"
#include "time.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/joystick.h>
#define JOY_DEV "/dev/input/js0"
BYTE Start[] = {0x00};
BYTE MAB[256] = {0};
BYTE DMX_Data[512];
DWORD   BytesWritten;
void delay_ms(unsigned int howLong);
void delay_us(unsigned int howLong);
int main(void)
DWORD dwBytesInQueue = 0;
FT_STATUS ftStatus;
FT_HANDLE ftHandle;
int iport = 0;
float fAxis;
//////////////////////////////////// JOYSTICK Definitions /////////////////////////////
int f;
int joy_fd, *axis=NULL, num_of_axis=0, num_of_buttons=0, x;
char *button=NULL, name_of_joystick[80];
struct js_event js;
if( ( joy_fd = open( JOY_DEV , O_RDONLY)) == -1 )
printf( "Couldn't open joystick\n" );
return -1;
ioctl( joy_fd, JSIOCGAXES, &num_of_axis );
ioctl( joy_fd, JSIOCGBUTTONS, &num_of_buttons );
ioctl( joy_fd, JSIOCGNAME(80), &name_of_joystick );
axis = (int *) calloc( num_of_axis, sizeof( int ) );
button = (char *) calloc( num_of_buttons, sizeof( char ) );
printf("Joystick detected: %s\n\t%d axis\n\t%d buttons\n\n"
, name_of_joystick
, num_of_axis
, num_of_buttons );
fcntl( joy_fd, F_SETFL, O_NONBLOCK ); /* use non-blocking mode */
////////////////////////////////////////// DMX ////////////////////////////////////////
ftStatus = FT_Open(iport, &ftHandle);
if(ftStatus != FT_OK) {
This can fail if the ftdi_sio driver is loaded
use lsmod to check this and rmmod ftdi_sio to remove
also rmmod usbserial
printf("FT_Open(%d) failed\n", iport);
return 1;
ftStatus = FT_SetDataCharacteristics(ftHandle, FT_BITS_8, FT_STOP_BITS_2,FT_PARITY_NONE);
if(ftStatus != FT_OK)
                printf("Can't set characteristics\n");
                return 1;
ftStatus = FT_SetBaudRate(ftHandle,250000);
        if(ftStatus != FT_OK) {
                printf("Can't set baudrate\n");
                return 1;
//////////////////////////////// Read Joystick data /////////////////////////////
read(joy_fd, &js, sizeof(struct js_event));
/* see what to do with the event */
switch (js.type & ~JS_EVENT_INIT)
axis   [ js.number ] = js.value;
button [ js.number ] = js.value;
/* print the results */
//printf( "X: %6d  Y: %6d  ", axis[0], axis[1] );
//if( num_of_axis > 2 )
// printf("Z: %6d  ", axis[2] );
//if( num_of_axis > 3 )
// printf("R: %6d  ", axis[3] );
//for( x=0 ; x<num_of_buttons ; ++x )
// printf("B%d: %d  ", x, button[x] );
if(axis[0] < 0)
if(DMX_Data[0] != 0)
DMX_Data[0] -= 5;
else if(axis[0] > 0)
if(DMX_Data[0] < 0xFF)
DMX_Data[0] += 5;
if(axis[1] < 0)
                        if(DMX_Data[2] != 0)
                        DMX_Data[2] -= 5;
                else if(axis[1] > 0)
                        if(DMX_Data[2] < 0xFF)
                        DMX_Data[2] += 5;
if(button[0] == 1)
DMX_Data[5] = 0xFF;
  DMX_Data[7] = 0xFF;
if(button[1] == 1)
                        DMX_Data[5] = 0xFF;
                        DMX_Data[6] = 0xFF;
if(button[2] == 1)
                        DMX_Data[5] = 0xFF;
                        DMX_Data[8] = 0xFF;
       if(button[3] == 1)
                        DMX_Data[5] = 0x00;
                        DMX_Data[6] = 0x00;
DMX_Data[7] = 0x00;
                        DMX_Data[8] = 0x00;
/////////////////////////// Send DMX512 Packet ///////////////////////////////////
ftStatus = FT_SetBreakOn(ftHandle);
delay_ms(10); //10ms delay
ftStatus = FT_SetBreakOff(ftHandle);
ftStatus = FT_Write(ftHandle,Start,sizeof(Start),&BytesWritten);
ftStatus = FT_Write(ftHandle,DMX_Data,sizeof(DMX_Data),&BytesWritten);
return 0;
void delay_ms (unsigned int howLong)
  struct timespec sleeper, dummy ;
  sleeper.tv_sec  = (time_t)(howLong / 1000) ;
  sleeper.tv_nsec = (long)(howLong % 1000) * 1000000 ;
  nanosleep (&sleeper, &dummy) ;
void delay_us (unsigned int howLong)
  struct timespec sleeper, dummy ;
  sleeper.tv_sec  = (time_t)(howLong / 1000000) ;
  sleeper.tv_nsec = (long)(howLong % 1000) * 1000 ;
  nanosleep (&sleeper, &dummy) ;


How to compiling C and C++ programs
Archives contains all files you need













Friday, 15 August 2014 07:39

Raspberry PI DS18B20 connect to GPIO

Written by


How to connect DS18B20 to RaspberryPI GPIO






How to view what is the ID of the Device?


In terminal


pi@raspberrypi /sys/bus/w1/devices $ cd /sys/bus/w1/devices/
pi@raspberrypi /sys/bus/w1/devices $ ls
28-000004d13e6d  w1_bus_master1
28-000004d13e6d This is a my ID 



How to test DS18B20


cat /sys/bus/w1/devices/28-000004d13e6d/w1_slave



t=26500 = 26.5 C


PHP Script 


//File to read
$file = '/sys/bus/w1/devices/28-000004d13e6d/w1_slave';
//Read the file line by line
$lines = file($file);
//Get the temp from second line 
$temp = explode('=', $lines[1]);
//Setup some nice formatting (i.e. 21,3)
$temp = number_format($temp[1] / 1000, 1, ',', '');
//And echo that temp
echo $temp . "C";


Download PHP Script - DOWNLOAD


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