The large amount of flash memory is useful for buffering Paclitaxel microtubule collected data, as described below.In order to monitor oar motion we examined the feasibility of designing an accelerometer-based Inhibitors,Modulators,Libraries sensor that uses only accelerometers to compute the linear and angular motions of a rigid body. The main motivation for developing a gyroscope-free system was that low-cost gyroscopes lack the accuracy needed for precise oars monitoring [7]. Moreover, low cost gyroscopes (automotive applications) cost about an order of magnitude more with respect of 3 axis accelerometers. In addition, it was reported in [8, 9] that due to challenges associated with gyroscopes hardware integration, the levels of precision required for our problem cannot be achieved in the near future with inexpensive gyroscopes.

For the later reasons, Inhibitors,Modulators,Libraries we were limited to use accelerometers by our prime design constrain which was minimize sensors cost. In theory, a minimum of six accelerometers is required for a complete description of a 3D rigid body motion [10, 11]. The key to a solution of the feasibility problem is the choice of location and orientation of the accelerometers. In our case a feasible cube configuration of six accelerometers is then considered (Figure 2), and based on this configuration, a basic algorithm to subtract rotation and translation was developed.Figure 2.Diagram of the accelerometers position.To adapt two MEMS (Micro Electro Mechanical System) accelerometers to the required geometry without jeopardizing system flexibility, two Inhibitors,Modulators,Libraries sensor boards for each sensor node, as presented in Figure 3, were developed.

Each board was equipped with a LIS3L02AS4 Inhibitors,Modulators,Libraries [12] MEMS low-power three axes linear accelerometer.Figure 3.Developed PCB plugged to telosb.The LIS3L02AS4 has a user selectable full scale range of ��2g, ��6g and it is capable of measuring accelerations over a bandwidth of 1.5KHz for all axes. It features a signal conditioning, Entinostat a 1 pole low pass filter at 100 Hz, and temperature compensation. It has an analog output which is sampled using the microcontrollers embedded 12 bit AD converter. The power consumption of the LIS3L02AS4 is less than 0.85 mW [12].A single sensor node consisted of the sensor board, the interface board and battery holder with two AA batteries, all of which were housed inside a cylindrical PVC tube weatherproof and watertight, as presented in Figure 4, which was adapted to the inside oar end.

Figure 4.Mounting the mote inside the oar.The boat sensor node was also equipped with a two single three axis accelerometer selleck chemical Nutlin-3a to track vertical and horizontal motion of the boat. The difference among oar and boat sensors was the packaging. In that case, a waterproof case to keep the sensor dry from water splashing replaced the cylindrical packaging used for the oar sensors. As a base station we used a telosb mote connected to a laptop which could be used in the same boat or in the accompanying boat.3.2.