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This paper proposes an interface circuit for a three-electrode metal-oxide (MOX) gas sensor. The proposed interface circuit adopts a pulse width modulation (PWM) signal to control the heater and to measure the sensor resistance almost simultaneously. Furthermore, to measure the resistance of the sensing material, our circuit adopts a scheme that works regardless of the asymmetry of the sensor geometry...
This paper describes a system for the simultaneous dynamic control and thermal characterization of the heating and cooling phases of an ultralow-power (ULP) micromachined sensor, featuring thermal characteristics that are quite similar to those of innovative ULP semiconducting metal-oxide gas sensors. A pulsewidth-modulated (PWM) excitation system has been realized using a microcontroller featuring...
This paper describes an embedded system for the simultaneous dynamic control and thermal characterization of the heating phase of an Ultra Low Power (ULP) micromachined sensor, featuring thermal characteristics quite similar to those of innovative ULP semiconducting metal oxide (MOX) sensors. A Pulse Width Modulated (PWM) powering system has been realized using a microcontroller featuring an ARM7...
An electronic system based on a microcontroller architecture devoted to interfacing an Ultra Low Power (ULP) Metal OXide (MOX) gas sensor is presented. The circuit controls the operating temperature and manages the acquired data. A Pulse Width Modulation (PWM) signal with variable duty cycle is used to provide power to the heating resistor in order to set the desired operating temperature. The heating...
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