Jun

2

Pictures from Computex 2009

15 years ago, at the start of June | Leave a Comment

Two of my colleagues are in Taipei again attending Computex 2009 this week and the news is that there appear to be a whole lot of netbooks on view. As ever Nick is uploading pictures to Picasa so you can get some idea of what’s about. As the days progress Nick will update the images, but it is a slow, slow process. Keep your eyes peeled for the rest of the week – and make sure you’re not looking at last years’ pictures by mistake ;). Some of you might notice that some things like the Asus Skype phone have been around for a little while. In fact it has been around since September of last year.

Update 1: More pictures are available.

Update 2: Pictures from day 3 are available now.

Update 3: Pictures from day 4 are available now. There are also some shots of Taipei

Tagged with: computex • hardware • linux • software
June 2, 2009 10:51

Mar

1

Gratifying Graphic Gizmos

15 years ago, at the start of March | 2 Comments

Yesterday the Current Cost unit actually got installed for real, something I was dreading. Dreading not because it was a difficult thing to do but simply because I expected the figure it would show would be terrible. Guess what, it wasn’t. In fact it seemed to be fairly close to that of other people who are monitoring theirs. The initial figure of 371 Watts didn’t last too long once the dishwasher and oven came on and an interesting spike appeared when the hob went on for the kettle.

Continuing with my sudden graphing fetish, as well as using a Current Cost unit I have dotted a number of little devices I’ve built with Xbee and Arduinos to measure temperatures (and other things) around the house. More information on those will come out later, but it’s an interesting project too.

Since I have the data for those it’d be rude not to graph them too, there’s a sample in the thumbnails below.

Not content with graphing them locally I picked up a Pachube invite and started graphing data there too. The process is simple really and as you can see on the right hand side of this page under ‘Graphy Stuff’, graph images can be embedded in your own or other sites. The really interesting thing about Pachube is that you can share your data with people who may be interested. The data they get to see is delayed by approximately 15 minutes. If you output your data in the eeml format then you can specify your own tags too.

Tagged with: 1-Wire • arduino • development • environment • hardware • monitoring • Pachube • software
March 1, 2009 8:47

Feb

13

Current Cost Capers

15 years ago, mid-February | 4 Comments

My ~~Unbioctium~~ Current Cost CC128 arrived on Thursday and although I’m not going to actually get a chance in install it for a couple of weeks I did have a play. The first thing to do once it was all up and paired with the base was get the output into my laptop. To do this you will need to buy the data cable or make up your own…

At first I tried to be smart with reading from the serial port, as that seems to be a bit unreliable I fell back on the old tried and tested method. I also decided from the outset that I was going to parse the XML that the the CC128 spat out rather than just filter the bits needed with regexp.

You will need to make sure you have the perl modules Device::SerialPort and XML::Simple installed. If you don’t have them then as root on your linux box do the following:

perl -MCPAN -e shell

then install each module, for example Device::SerialPort,

install Device::SerialPort

and here’s the script which is also available for download.Updated to make it more reliable.

#!/usr/bin/perl
 
use Device::SerialPort qw( :PARAM :STAT 0.07 );
use XML::Simple;
 
$port = "/dev/ttyUSB0";
 
$ob = Device::SerialPort->new($port) or die "Can not open port $port\n";
$ob->baudrate(57600);
$ob->write_settings;
$ob->close;
 
# using XML::Parser speeds xml parsing up lots!
$backend = 'XML::Parser';
$ENV{XML_SIMPLE_PREFERRED_PARSER} = $backend;
 
# we use this to only do 1 iteration (or not)
$escape=0; 
 
open(SERIAL, "<$port");
 
while($escape <= 0) {
	sleep(2);
 
	while ($line = <SERIAL>) {
 
		# for debug
		#print $line;
 
		$isValid = (index($line,"<msg>") != -1);
 
 
		if (!$isValid) { last; }
 
		print "This data is".($isValid==1?"":" not")." valid\n";
 
		# force XML::Simple to see this as a string not as a file
		# since XML::Simple is stupid and needs to be shot
 
		$line = "<fakeTag>$line</fakeTag>";
 
		$isHistoric = (index($line,"<hist>") != -1);
 
		$nref = XMLin($line,forcearray => 0);
 
		$ref = $nref->{msg};
 
		# just for reference, show if data is historic or not
 
		print "This data is".($isHistoric==1?"":" not")." historic\n";
 
 
		if (!$isHistoric) {
 
	        	$dsb        = 0 + $ref->{dsb};
        		$recordTime = $ref->{time};
        		$ccname     = $ref->{src};
        		$temp       = $ref->{tmpr};
			$ch1watts   = 0 + $ref->{ch1}->{watts};
			$sensor     = 0 + $ref->{sensor};
			$id         = $ref->{id};
			$type       = 0 + $ref->{type};
 
 
			if (defined $ref->{whatever}) {
				# do something based on whatever
 
			}
 
        		print "This $ccname was born $dsb days ago as at $recordTime - temperature is: $temp :: Current Watts in use on channel 1 are $ch1watts :: Sensor is $sensor, with an id of $id and a type of $type\n";
 
			# for cacti you'd probably just want to output CC_Temperature:$temp CC_Watts1:$ch1watts 
 
			# insert data into db
 
			# if you want to exit after a 'good' iteration set this to 1 otherwise set it to 0 (or don't change it to 1 :) );
			$escape=1;
		} else {
			#process or ignore historic data
		}
	}
}
 
close(SERIAL);

and here’s some example output, remember that I haven’t actually connected the loop around my electrical cable as yet.

This data is not historic
This CC128-v0.11 was born 1 days ago as at 21:16:44 - temperature is: 23.7 :: Watts used on channel 1 are 0 :: Sensor is 0, with an id of 02835 and a type of 1

Historic data isn’t processed at the moment but it would be trivial to do. I’m not processing it since I don’t really see the point if you’re going to store the results in a database.

Tagged with: hardware • monitoring • opensource • software
February 13, 2009 9:38

Feb

4

One Wireduino made easy

15 years ago, at the start of February | 12 Comments

For a very long time now I’ve been playing with the Arduino boards but it wasn’t until I recently discovered some DS1820 1-wire chips in my parts box that I started even thinking about 1-wire stuff. Connecting 1-wire devices to the Arduino is, well, amazingly simple. Using the sample circuit from the datasheet we can see the connections are few and far between.

Please note that this is the corrected circuit, previously the VDD was not tied to ground. While the circuit would work it would only give reliable results on very short runs. This circuit allows longer runs to the sensor.

Coding this up is also made extremely easy with the OneWire library. I’ve put together a little application below that will read all of the 1-wire devices on a bus. If you press L in the Arduino IDE serial monitor it will list all the 1-Wire device id’s and if you press T you’ll get the id and temperature reading.

/*
Simple 1-wire device reading
 
Pass T over serial to get temperatures
Pass L to list 1-wire devices
 
*/
#include <OneWire.h>
#include <stdio.h>
 
#define CONVERT     0x44
#define READSCRATCH 0xBE
#define SKIP_ROM    0xCC
#define MATCH_ROM   0x55
 
OneWire  ds(10);  // The DS18S20 is connected on pin 10
int ledPin = 13;  // flash an led on 13 - we all like flashing lights
 
void setup(void) {
  // initialize inputs/outputs
  // start serial port
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);  //we'll use the led to output a heartbeat
}
 
void loop(void) {
  int incomingByte = 0;
  if (Serial.available() &gt; 0) {
		// read the incoming byte:
		incomingByte = Serial.read();
 
		// say what you got:
		//Serial.print("I received: ");
		//Serial.println(incomingByte, DEC);
                if (incomingByte == 84) {
                  getStuff();
                  Serial.print("\r\n^");
                } else if (incomingByte == 76) {
                   listDevices();
                }
	}
 
}
 
void listDevices(void) {
 
  byte addr[8];
 
  ds.reset_search();
 
  while(ds.search(addr)) {
 
     digitalWrite(ledPin, HIGH);   // sets the LED on
 
     if ( OneWire::crc8( addr, 7) == addr[7])   {
         if ( addr[0] == 0x10) {
            // Make sure it is a DS18S20 device
            char buffer[512];
            sprintf(buffer,"Id:%02x%02x%02x%02x%02x%02x%02x%02x\r\n",
                       addr[0], addr[1], addr[2], addr[3], addr[4],
                       addr[5], addr[6], addr[7]);
              Serial.print(buffer);
          }
      }
  }
 
    Serial.print('^');
}
 
void getStuff(void) {
  byte i;
  byte present = 0;
  byte data[12];
  byte addr[8];
  char buff[15];
  float real_temp;
 
  float temp_count;
  float read_temp; 
 
  ds.reset_search();
 
  while(ds.search(addr))  {
 
     digitalWrite(ledPin, HIGH);   // sets the LED on
 
    if ( OneWire::crc8( addr, 7) != addr[7])  { // Check CRC is valid
        Serial.print("CRC is not valid");
    }
 
    if ( addr[0] != 0x10) {   // Make sure it is a DS18x20 device
      Serial.print("Device is not a DS18x20 family device.");
    }
 
    ds.reset();    // Reset device
    ds.select(addr);     // Select device
    ds.write(CONVERT,1);   // Issue Convert command 
 
    delay(1000);     // maybe 750ms is enough, maybe not
    digitalWrite(ledPin, LOW);    // sets the LED off
 
    present = ds.reset();  // Reset device
    ds.select(addr);  // Select device
    ds.write(READSCRATCH);  // Read Scratchpad
 
    for ( i = 0; i &lt; 9; i++) {  // we need 9 bytes
          data[i] = ds.read();
    }
 
    if(OneWire::crc8( data, 8) == data[8]) {  // Check CRC is valid
 
      // CRC is ok
      // Divide the temperature by 2 - note the » and
      // « need to be replaced with double < and >
      // wordpress kills the server when you try to 
      // save otherwise.
      read_temp=((data[1]«8) | data[0]) » 1 ;
     // Convert to real temperature
      temp_count=float(data[7] - data[6])/(float)data[7];
      real_temp = ((float)read_temp-0.25)+temp_count;
 
       // Convert float to ascii
      tempToAscii(real_temp,buff);
      char buffer[512];
      sprintf(buffer,"%02x%02x%02x%02x%02x%02x%02x%02x %s\r\n",
                  addr[0], addr[1], addr[2], addr[3], addr[4],
                  addr[5], addr[6], addr[7], buff);
 
      Serial.print(buffer);
 
    } else    {
       Serial.println("CRC Failed");
    }
  }    
 
void tempToAscii(double temp, char *buff) {
  int frac;
  //get three numbers to the right of the decimal point
  frac=(unsigned int)(temp*1000)%1000;
  itoa((int)temp,buff,10);
 
  strcat(buff,".");
  //put the frac after the decimal
  itoa(frac,&amp;buff[strlen(buff)],10);
}

There’s also a copy of the .pde file that you can download if you feel more inclined. It’s not an exact copy, I removed the commented out xml for the above version. It’s worth pointing out that this circuit is using what is called parasitic power, which means your cable run should be shortish. If you want to use an external power supply then pin 3 (VDD) on the DS18S20 should go to your external supply. This would allow for much longer runs of cable. Below is an example graph generated by cacti with 2 DS1820’s connected the the arduino. As you can see the temperatures aren’t exactly the same but this is to be expected since the accuracy of the DS1820 is +/- 0.5 ° C

The breaks in the graph were caused my me removing the USB plug from the PC it was connected to so that I could make some minor alterations to the circuit.

Josh asked how I was getting the input for Cacti, here’s the perl script I use

#!/usr/bin/perl
 
$output = `echo -en "T" >>/dev/ttyUSB0 && cat /dev/ttyUSB0`;
 
@lines = split(/\r\n/,$output);
$t=1;
 
foreach $line (@lines) {
 
       @spl = split(/\s+/,$line);
 
	$lc = @spl;
 
	if ($lc gt 1) {	
                $node=$spl[0];
		$val=$spl[1];
 
		print "Temperature_$node:$val ";
	}
$t++;
}

This outputs Temperature_x:n where x is the 1-Wire id and n is the temperature. It could probably do with tidying up and if you wanted to you could pass the 1-Wire id to the script to and only output the temperature for that particular 1-Wire device. A copy of the exported Cacti template can be downloaded, I’m hoping that you just need to import that into your Cacti after placing the script in the scripts directory. Just remember, under linux, if you unplug and replug in your Arduino you may need to set the tty port speed to 9600 (or whatever you put in your Serial.begin(); ). You can use the following command for that;

1
2
3

 
 
stty -F /dev/ttyUSB0 cs8 9600 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts

Make sure that ttyUSB0 is what your Arduino is connected to first. If not you will need to change it in the perl script and on the line above.

Tagged with: 1-Wire • arduino • hardware • opensource • software
February 4, 2009 21:46

Nov

1

Meet JO Black

16 years ago, at the start of November | Leave a Comment

Having the IMIV in the car makes driving around much more fun but up until recently I had my iPhone and prior to that my iPod Classic flapping about on the passenger seat. It worked but wasn’t particularly elegant and of course the moment I had a passenger in the
car there was a problem. This week I finally broke and decided to sort out the problem. To be honest I was looking for something cheap and functional. A quick search lead me to the JO BLACK from x castro design. This is a rather simple frame with what I can only describe as a bulldog clip on the back. The JO works rather simply. You squeeze the clip to open it and slip it onto one of your car air vents. Your iPod or iPhone or other device slips into it, gently held by the neoprene arms. The arms can be bent to allow more or less grip, so, although it seems to be an iPhone or iPod holder it isn’t just that, it can safely hold pretty much any handheld device – within reason of course. The fact that it has an open base means I can have the IMIV cable connected with no issues.

The JO is available with the neoprene in one of 7 colours, the base frame is always black but the colour range is varied enough for most tastes.

If you’re looking for a passive holder for your phone or music player then for the money the JO series suit. One thing I did notice when looking at the pricing on their site compared to Amazon was that although the x castro site and Amazon prices matched (after shipping), there seemed to be no way to select the free shipping for the UK. The 3 options in the dropdown box all added more to the price.