Posts Tagged ‘basic hardware for projects’

DIY: 3 PC-USB KVM

IMG_20130908_121553

IMG_20130908_121217

IMG_20130908_121210

IMG_20130908_121203

 

 

 

 

 

 

 

 

 

 

 

 

 

Hello again,

The trouble, I was facing when I made this was that, I was using three machines together so that means 3 keyboards and 3 mouse, well 2 mouse one of those machines was console based, and I didn’t had much space on my table it was getting much hectic managing all the keyboards and mouses. And KVM’s in market I found were quiet expensive. so the solution was quiet simple and cheap; I took 8 small relays, cut-out of vero board, two toggle buttons, one usb-female for wireless RF receiver of Keyboard and Mouse and 3 usb-male for 3 machines and Altoids box to fit it all in.

I powered it externally, do not use usb to from machine to power the relays, it could fry your usb controller hub in machine. so two toggle switches meant;

 

00, 01, 11, 10

 

concept was quiet simple usb has 4 wires 2 of them are for power and 2 in center for data .. I distributed them, on toggle the connection of wires changed from one usb-male to another .. Sharing one wireless keyboard and mouse with 3 machines.

Kinect Car

 

 

De’Ranged Bot from Kazi Murtaza.

Communication Mediums: Netduino Ethernet Part 2

Results were not the same, Netduino Ethernet was way faster than Arduino WiFi, no delay’s instant execution, Netduino Plus is bundle of joy for those who wish to build home automation cheap solution with Ethernet and SD-card slot, wins the race again Arduino & Arduino WiFi, making Netduino a web server and parsing data was a breeze and no bugs, I find it to be wonderfully robust, have a look at the video below;

Netduino & Ethernet Sheild : Controlling my room lights from Kazi Murtaza.

 

and here is the code first webserver.cs

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using System;
using Microsoft.SPOT;

namespace WebServer
{
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;

public class WebServer : IDisposable
{
private Socket socket = null;
//open connection to onbaord led so we can blink it with every request
private OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);

static OutputPort Device1 = new OutputPort(Pins.GPIO_PIN_D5, false);
static OutputPort Device2 = new OutputPort(Pins.GPIO_PIN_D6, false);
static OutputPort Device3 = new OutputPort(Pins.GPIO_PIN_D7, false);

static OutputPort Device4 = new OutputPort(Pins.GPIO_PIN_D8, false);
static OutputPort Device5 = new OutputPort(Pins.GPIO_PIN_D9, false);
static OutputPort Device6 = new OutputPort(Pins.GPIO_PIN_D10, false);

public WebServer()
{
//Initialize Socket class
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//Request and bind to an IP from DHCP server
socket.Bind(new IPEndPoint(IPAddress.Any, 80));
//Debug print our IP address
Debug.Print(Microsoft.SPOT.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()[0].IPAddress);
//Start listen for web requests
socket.Listen(10);
ListenForRequest();
}

public void ListenForRequest()
{
while (true)
{
using (Socket clientSocket = socket.Accept())
{
//Get clients IP
IPEndPoint clientIP = clientSocket.RemoteEndPoint as IPEndPoint;
EndPoint clientEndPoint = clientSocket.RemoteEndPoint;
//int byteCount = cSocket.Available;
int bytesReceived = clientSocket.Available;
if (bytesReceived > 0)
{
//Get request
byte[] buffer = new byte[bytesReceived];
int byteCount = clientSocket.Receive(buffer, bytesReceived, SocketFlags.None);
string request = new string(Encoding.UTF8.GetChars(buffer));
string filename = ProcessResponse.GetTextBetween(request, "(java 1.4)");

if(filename.Length>0){
filename.ToCharArray();
String DeviceID = "0"; if (!(filename[0].Equals(null))) { DeviceID = filename[0].ToString(); }
String DeviceSTATE = "0"; if (!(filename[2].Equals(null))) { DeviceSTATE = filename[2].ToString(); }

if (DeviceID.Equals("1")) {
if(DeviceSTATE.Equals("1")){
Device1.Write(true);
}
else if (DeviceSTATE.Equals("0")) {
Device1.Write(false);
}
}
else if (DeviceID.Equals("2")) {
if (DeviceSTATE.Equals("1"))
{
Device2.Write(true);
}
else if (DeviceSTATE.Equals("0"))
{
Device2.Write(false);
}
}
else if (DeviceID.Equals("3")) {
if (DeviceSTATE.Equals("1"))
{
Device3.Write(true);
}
else if (DeviceSTATE.Equals("0"))
{
Device3.Write(false);
}
}
else if (DeviceID.Equals("4")) {
if (DeviceSTATE.Equals("1"))
{
Device4.Write(true);
}
else if (DeviceSTATE.Equals("0"))
{
Device4.Write(false);
}
}
else if (DeviceID.Equals("5")) {
if (DeviceSTATE.Equals("1"))
{
Device5.Write(true);
}
else if (DeviceSTATE.Equals("0"))
{
Device5.Write(false);
}
}
else if (DeviceID.Equals("6")) {
if (DeviceSTATE.Equals("1"))
{
Device6.Write(true);
}
else if (DeviceSTATE.Equals("0"))
{
Device6.Write(false);
}
}
}

//Compose a response
string response = "Hello World";
string header = "HTTP/1.0 200 OK\r\nContent-Type: text; charset=utf-8\r\nContent-Length: " + response.Length.ToString() + "\r\nConnection: close\r\n\r\n";
clientSocket.Send(Encoding.UTF8.GetBytes(header), header.Length, SocketFlags.None);
clientSocket.Send(Encoding.UTF8.GetBytes(response), response.Length, SocketFlags.None);
//Blink the onboard LED
led.Write(true);
Thread.Sleep(150);
led.Write(false);
}
}
}
}

#region IDisposable Members
~WebServer()
{
Dispose();
}
public void Dispose()
{
if (socket != null)
socket.Close();
}
#endregion
}
public static class ProcessResponse
{
public static string GetTextBetween(string str, string a)
{
if (str == null || str == String.Empty) { return String.Empty; }

int aIdx = str.IndexOf(a);
if (aIdx == -1) { return String.Empty; }
int strt = aIdx + a.Length;

return str.Substring(strt).TrimStart();
}
}
}

Program.cs

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using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;

namespace WebServer
{
public class Program
{
public static void Main()
{
Microsoft.SPOT.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()[0].EnableStaticIP("10.0.0.11","255.255.255.0","10.0.0.1");
WebServer webServer = new WebServer();
webServer.ListenForRequest();
}

}
}

Communication Mediums: Arduino WiFi, RN-42 Bluetooth, Netduino Ethernet

Hello, I have gotten my hands on couple of communication devices which could be used for android and Arduino/ Netduino communication, first RN-42 SMD bought from robotics.pk – link, Arduino WiFi Shield also bought from robotics.pk – link and third is Netduino it self which comes with Ethernet shield built-in, and Netduino is given to me by my teacher for educational purposes only, sad cant keep it.

Any ways lets start of with, RN-42 SMD is fairly cheap comparatively to others available for sale on spark fun  and is very easy to use you just need 4 connections VCC(3.3v),GND,RX and TX and you are done and by default RN-42 runs on 115200 braud rate, I found this to be very cheap and easy to use although for making connections on the smd, could be stressing, you would need small and steady hands, after making connections and connecting it to my Arduino Mega 2560, I used my serial Bluetooth android app and data transfer was done perfectly and fast, and range was acceptable, about 50 to 60 feet. it is perfect fit for short range, battery powered application.

Second device is WiFi Shield, which lets Arduino board connect to the internet using the 802.11 wireless specification and comes with a micro-SD card socket for saving of html pages and data logging,  we could either use the WiFi Shield as Server or Client and in my case I use it as a server, although Arduino cant process anything above HTML and JavaScript but we can do with these all so well, with WiFi Shield, we use Get and Post methods – (which I will explain in next post how?) to send and receive data from Arduino, from then on its same as serial monitor or Bluetooth. So from my android I send a request on the ip which is assigned to WiFi Shield through DHCP, request could be Get or Post and Arduino executes that request.

Arduino and WiFi Shield : Controlling my room lights from Kazi Murtaza on Vimeo.

Third device which is Netduino in-built Ethernet Shield, I have not gotten around to configure it yet, but will do it next. I feel the results will be same as Arduino WiFi Shield.

So in end I realized one thing, WiFi Shield is a bit buggy, sometimes requests in buffer of Arduino don’t really execute and if they do its 4-5 sec delay, I guess it takes time to process the request and its fairly new so needs a firmware update, so WiFi shield is not recommended for on second execution for example like WiFi controlled car, for such projects Bluetooth should be preferred, and for projects such as Home Automation and such WiFi is ideal.

 

 

things

Requirement list

This is basic things i have at my dissposal, list you will need to follow my experiments, if you have any suggestion do comment

ITEM
ARDUINO MEGA 2560 Rev3
Bluetooth Serial Module
TRANSISTORS (C945)
RESISITANCE (330 ohm )
RESISITANCE ( 10k )
BREAD BOARD
JUMPER CABLES or WIRES
Relay 6V
PRINTER CABLE
ANDROID PHONE
ARDUINO WIFI SHIELD
7805 12V TO 5V
5V DC ADAPTER
100 OHM RESISTANCE
BLUETOOTH RN42 SMD
NETDUINO
9V BATTERY
9V BATTERY STRAP
VERO BOARD

for now I guess that’s it.