Abstract: A resistive touch screen controller provides two-finger gesture recognition. Current mirror circuitry, coupled to the XP/XN and YP/YN conductors, generates a screen current IL corresponding to X/y plate currents, and a corresponding mirror current IL/N. A variable resistor receives mirror current IL/N, and a resistance controller sets the resistance value R1 of the variable resistor, and monitors a variable resistor voltage VR1 based on IL/N*R1. A processor determines calibration voltages for the X and Y plates corresponding to the mirror current IL/N for X/Y voltage values of VR1 for a no touch condition, and X/Y offset voltages VOFS and HOFS of VR1 for a two touch condition. For a two touch condition, the processor determines touch resistance relative to no touch, and generates an adjusted X/Y plate resistance ?X/?Y based on VOFS/HOFS, and based on X/Y, determines a distance and angle between the two touches.

Abstract: The disclosure provides measuring a current on a top and bottom touch screen, wherein the top touch screen is not being touched; measuring a current on a top and bottom touch screen, wherein the top touch screen is not being touched by one finger; measuring a current on a top and bottom touch screen, wherein the top touch screen is not being touched by two fingers; calculating a one a two finger threshold on a plurality of touch screens, wherein, if the touch is a two finger touch: calculating an orientation of the two finger touch; and calculating a change of position of at least one finger of the two finger touch, wherein the processor employs a deriviative of the change of current on at lest one of the plates over time to determine a characteristic of the position.

Abstract: Battery driven display device includes a battery, first and second comparators, non-volatile memory, controller driven by the voltage of the battery, and display device. Non-volatile memory stores the first and second reference voltages of the first and second comparators measured by using stabilized power supply. Controller detects when the first and second reference voltages of the first and second comparators become lower than the voltage of the battery when battery is connected, and determines the time at which end-point voltage of the battery will be reached based on the first and second detection times at the time of measurement and the measured reference voltages.

Abstract: A particulate detector system is provided that can sense particulates (such as smoke in the air). The system employs a reflected light system that generally avoids making measurements of light intensity. Instead, coded signals are compared with one another to determine error rates between emitted light and detected light (across a chamber). Based on the error rate, processing circuitry can determine particulate concentration.

Abstract: A particulate detector system is provided that can sense particulates (such as smoke in the air). The system employs a reflected light system that generally avoids making measurements of light intensity. Instead, coded signals are compared with one another to determine error rates between emitted light and detected light (across a chamber). Based on the error rate, processing circuitry can determine particulate concentration.

Abstract: Battery driven display device includes a battery, first and second comparators, non-volatile memory, controller driven by the voltage of the battery, and display device. Non-volatile memory stores the first and second reference voltages of the first and second comparators measured by using stabilized power supply. Controller detects when the first and second reference voltages of the first and second comparators become lower than the voltage of the battery when battery is connected, and determines the time at which end-point voltage of the battery will be reached based on the first and second detection times at the time of measurement and the measured reference voltages.

Abstract: The input capacitance of a current outputting amplifier for the case where it is connected to an electrostatic sensor portion is preliminarily allowed for and after a capacitance equivalent to this input capacitance is added to the input terminal of the amplifier, an offset in the output of the amplifier is cancelled. The added capacitance is then isolated from the input terminal of the amplifier and electrodes in the electrostatic sensor portion are scanned to generate touch detection signals.

Abstract: The input capacitance of a current outputting amplifier for the case where it is connected to an electrostatic sensor portion is preliminarily allowed for and after a capacitance equivalent to this input capacitance is added to the input terminal of the amplifier, an offset in the output of the amplifier is cancelled. The added capacitance is then isolated from the input terminal of the amplifier and electrodes in the electrostatic sensor portion are scanned to generate touch detection signals.

Abstract: The improved small current detector circuit and locator device each include a first and a second capacitor, a pulse drive circuit which drives one terminal of each capacitor by a pulse signal and charges and discharges the capacitors in synchronism with the rise and fall of the applied pulse so as to generate a first and a second detection signal at the other terminal of each capacitor. A current generator circuit receives the first and second detection signals and generates a current representing the difference between the levels of said signals. An integrator circuit integrates the output current from the current generator circuit. At least one of the first capacitor or second capacitor is provided in a detection portion of the detector circuit or locator device.

Abstract: Improved small current detector circuit and locator device each comprise a first and a second element in both of which a small current output occurs, a first and a second constant current generator circuit each generating a specified constant current, a first current mirror circuit which is supplied at the input with said output current occurring in said first element and said specified constant current generated from said first constant current generator circuit, and a second current mirror circuit which is supplied at the input with said output current occurring in said second element and said specified constant current generated from said second constant current generator circuit, and wherein either one of said first and second elements is disposed in a detecting portion and a current equal to the current from the output of either one of said first and second current mirror circuits is flowed to the output of the other current mirror circuit such that a detection output corresponding to the difference betw