best large touch screen displays.To measure in the Y- axis direction, the top bus is biased to VREF and the bottom bus is biased to 0V . The ADC input is connected to the left or right bus, and the voltage can be measured when the top layer is in contact with the bottom layer. Figure 5 shows a simplified model of a four-wire touch screen when two layers are in contact. For a four-wire touch screen, the ideal connection method is to connect the bus biased to VREF to the positive reference input of the ADC , and connect the bus set to 0V to the negative reference input of the ADC .

best large touch screen displays.To measure in the Y- axis direction, the top bus is biased to VREF and the bottom bus is biased to 0V . The ADC input is connected to the left or right bus, and the voltage can be measured when the top layer is in contact with the bottom layer. Figure 5 shows a simplified model of a four-wire touch screen when two layers are in contact. For a four-wire touch screen, the ideal connection method is to connect the bus biased to VREF to the positive reference input of the ADC , and connect the bus set to 0V to the negative reference input of the ADC . IQTouch K interactive touch screen feature 20-point touch and dual system -- Android 8.0 system and optional OPS Windows 10Pro system. Its 4K UHD resolution facilitates presentations and collaboration. With optional multi-screen casting software, IQClass 6.0 and installation-free IQClass Plus software, IQTouch K Series can help create an interactive and collaborative teaching atmosphere in class.