Since the first ZigBee release in 2004, two revisions (ZigBee 2006v and ZigBee-Pro 2007v) have seen the light. This article comes to explain which are the improvements and changes which have been done to the initial version during the last 4 years.

Regarding the 802.15.4 vs ZigBee article, it is important to know which module in the market fits better our requirements and how they behave. In this article we analize the Freescale and Ember radio chipsets integrated inside the Digi XBee modules and their compatibilities and uncompatibilities.

People often get confused with all the communications technologies which are used in the WSN field: 802.15.4, ZigBee, Mesh protocols, 2.4GHz, 868MHz and 900MHz bands... This first document compares both IEEE 802.15.4 and ZigBee technologies and explains its main characteristics.

Can a modulation radio be ZigBee certified? What does a communication module mean to be ZigBee compliance? What should I do to get a ZigBee certified sensor device? These and other questions answered in this article.

One of the main challenges when treating the objects and people location field is when they have to be found indoor. We have created a new device called X-Tick as a tool to let the creation of triangulation applications based on the RSSI parameter computation.

When monitoring risk situations it is important to be able to generate alarms in real time and in the same place where the parameter is detected. For this scenarios the ideal solution is to send a SMS directly to the secutity forces such as fireman brigade or policy. This article shows how to use the GPRS/GSM communication module for SquidBee and configure it to send SMS's in the same time it happens.

Libelium has launched a survey to ask developers and companies which sensors they would find useful a mote to bring. They are currently working on the development of the sensor integration board for Waspmote and they want to take into account your opinion. Think in a WSN project you would like to develop and tell them which sensors the motes should have to bring. There will be a prize draw for a Waspmote Developer Kit among all the participants. The survey: http://www.waspmote.com/survey/

Since we are often unable to connect our SquidBee to a main power supply, we needed to find the best way of powering it while minimizing maintenance operations, such as battery changes. Sun provides a clean, cheap, infinite power source, so we have developed a board to take advantage of this by attaching a solar cell to our mote.

The MicroSD module for Arduino is a small shield that you can connect to Arduino, once the shield is connected, you add SD flash memory to Arduino. The SD socket is connected to SPI port.
With this module you can store a big amount of information (1Gb microSD card is included).

Continuing with the sensor integration, we have added to the SquidBee mote a magnetic field sensor based on the Hall-Effect. The sensor, capable of detecting magnetic fields of 50 mT,  provides the mote with a digital output that denotes the presence of the field; which can be used in different control and monitorization applications.

Wireless Sensor Network use normally IEEE 802.15.4 / ZigBee technologies for communication among motes, technologies like these are very useful to tramsmit data between motes. But some times in Wireless Sensor Network is interesting to count with a long  range  communication technology to send / receive data to a remote user, server or alarm center. Using the cell networks throught the GPRS/GSM module we are going to make our motes be able to work and send information in almost anywhere.

Maybe one of the most important feature of the motes in a wireless sensor network is the time a mote is able to be working without charging its battery. In this article we are going to develope a code on SquiBee using the sleep features and cyclic waking up. With this working mode we are gonig to save a big amount of energy.

We have developed a SONAR mote for detecting presence and measuring distances up to 6.45m. It is constructed from an integrated ultrasound sensor placed into a SquidBee mote which wirelessly outputs range values whenever there is any moving object within the monitored area.

Here we have the classic presence detector built in a SquidBee mote. We use a PIR sensor integrated with an on-board circuitry and a Fresnel lens, suitable for detecting presence from anything emitting infrared radiation up to a distance of 6m, and connect it to a wireless emitter in order to receive the corresponding alarm. The mote is also prepared to remain in a low-consumption state, resulting in a perfect device for battery-powered applications.

In this article we are going to show how to improve a SquidBee mote adding GPS position using the GPS module from Libelium. To the three usual sensors (temperature, humidity and light) now we add the physical position as a sensor. With this improvement into the motes our sensor network is able to provide the coordinates of each node in real time.

Once we have some SquidBees running in our sensor network it's time to add new sensors. In this articule we are going to add a vibration sensor to SquidBee. With this new sensor we'll be able to detect movements on the mote such as falls, crashes, seismic activity or even chek the amount of the  mote vibration movement to measure special events.

SquidBee is a wireless sensing mote which simultaneously measures temperature, relative humidity and intensity of light and wirelessly sends data to a central monitoring Gateway. This tutorial is intended to provide a quick assembly guide for those who want to build a SquidBee through easy construction steps.

Reading this article you will learn about the ways to keep the ip degree of enclosures which have  important componentes connected to the pcb outside them. We also talk about the advantages that this solutions gives to the company.