These circuits are based on ideas previously presented in conferences and journal briefs [15,16]. The comparison is to be taken as an approximation, since final performance depends www.selleckchem.com/products/DAPT-GSI-IX.html on many factors, for instance the PCB technology, the encapsulation of integrated circuits and electronic components, Inhibitors,Modulators,Libraries or the specific device chosen for the electronics to be based on.2.?Piezoresistive Sensors and CrosstalkMany tactile sensors are made of sheets of piezoresistive materials. The sheet covers an array of electrodes and we obtain an array of force sensing resistors Inhibitors,Modulators,Libraries as tactels. However, if a continuous sheet is used, parasitic resistors are present between tactels in the array. Moreover, crosstalk is present even if the array is composed of discrete force sensors once they are arranged in rows and columns [16,17].

The reason is that the addressing tracks are shared by many tactels and they form resistive paths that cause crosstalk. A circuitry that does not cancel crosstalk is depicted in Figure 1(a), where an example of a parasitic path is also shown. Crosstalk due to the electrical addressing Inhibitors,Modulators,Libraries (there can be a certain crosstalk for mechanical reasons) is not registered if a single tactel is pressed. However, if a group of tactels are pressed crosstalk alters the readings for them. It can be hidden if the pressed area presents some symmetry with respect to rows or columns, but it is clear in the other cases. For instance, Figure 1(b) shows the output of a sensor with the signal conditioning in Figure 1(a) for a slash bar on it. Note that there is significant crosstalk.

A few strategies Inhibitors,Modulators,Libraries to reduce the interference caused by these resistive paths have been proposed [18], although the best one that is commonly implemented is grounding. Its goal consists in having the same voltage at both sides of parasitic resistors, so they are virtually short-circuited. Circuits that implement this strategy will be shown in the next sections.Figure 1.(a) Electronics for piezoresistive tactile sensor that does not cancel crosstalk; (b) Tactile image obtained by a slash bar on it.3.?Electronics Based on a MicrocontrollerThe local electronics for a tactile array of N columns and M rows based on a microcontroller PIC18F4680 (Microchip) are shown at Figure 2(a). Cilengitide These electronics are in charge of scanning the array, storing
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