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Aspire :: OSGi Bundles :: TEMPerProducer

1 Aspire :: OSGi Bundles :: TEMPerProducer
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This section describes the bundle for TEMPer sensor

1.1 Context
The TEMPer is a USB-to-serial low-cost thermometer. It can be ordered from many websites. One of the cheapest is http://www.dealextreme.com/details.dx/sku.7003 .

The TEMPerProducer bundle registers one Producer service producing Measurement, Double or String objects (unit is K).

*WARNING:*\\
as seen on the Internet, there are two versions of this stick.
The current bundle has been tested with the gray version (old one apparently).
A blue version exists, with a different data transmission protocol.

1.1 Dependencies

This bundle requires :
* OSGi R4 Compendium, available from OBR in Felix Shell
* RXTX, available from Aspire SVN Repository/archive/rfidsuite/rfidsuite/bundles/rxtx/

1.1 Build
1.1.1 Sources
* trunk/bundles/sensors/temperproducer/

1.1.1 Device installation
Under Windows
# you must install the USB-to-Serial driver on your host with the CD provided with the USB stick (USB Driver/setup.exe).
# you may install the demonstration application (CD > TEMPer V8.1/setup.exe) to test the thermometer.
# inspect the serial COM port from "System Properties > Hardware > Device Management > Ports (COM and LPT) > USB-SERIAL (COMxx)"

Under Linux
# put the device on a USB port
# In dmesg, you should see a line like : ~~usb 7-2: ch341-uart converter now attached to *ttyUSB0*~~
# In this case, *ttyUSB0* is the serial port to use to read data from the stick.

*WARNING:*\\
Reading serial ports through /dev requires root rights.\\
Some hints to bypass that problem may be given here later.

Then
# cd trunk/bundles/sensors/temperproducer
# configure the serial port in src/main/java/org/ow2/aspirerfid/sensor/temperproducer/TEMPerProducer.java
# mvn clean install

1.1 Configuration

You must configure the properties for your dongle in the source (currently).\\
The default values are a COM14 port and a poll each 2 seconds.

See org/ow2/aspirerfid/sensor/temperproducer/TEMPerProducer.java

* Hard coded COM port :
** Default Value : ~~String portName = "COM14";~~
** Under Linux, you should use : ~~String portName = "/dev/ttyUSB0";~~

* Poll delay :
** Default value : ~~int POLLDELAY = 2000;~~

1.1 Artifacts
The artifact to deploy is
*  org.ow2.aspirerfid:org.ow2.aspirerfid.temperproducer

1. Tests
1.1 Under Linux

Tested under Fedora 13 (64 bits), kernel 2.6.33, with included driver

It seems that there is an alternance between a correct value and a constant value.\\
All the results looked like :

Where 305 K is a correct value (around 30°C), and 529.0875 (around 255.9°C) seems to be a control value.

1.1 Under Windows

Tested under Windows 7 Professional (32 bits), with the provided driver (on the CD-Rom).

Works fine, no problem found.