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We present the theoretical analysis and performance results of a direct microcontroller unit (MCU) interface circuit for capacitive sensors based on the charge-transfer method, when stray capacitances are considered. The interface circuit can implement two alternative two-point calibration techniques that reduce the effects of stray capacitance, temperature, and MCU parameters that depend on the power...
Resistive bridge sensors can be directly connected to a microcontroller by using time-based measurement circuits that yield a digital output proportional to the fractional resistance change. However, internal resistances (Rini) of microcontroller pins result in systematic errors. We propose an improved measurement circuit and two time-based equations to compensate for Rini. The proposed circuit and...
AMR and GMR magnetoresistive sensors are typically connected to form a Wheatstone bridge with four or two active sensing elements. The resistance change of each sensing element is proportional to the external magnetic field over a limited field range. The bridge output voltage is then linear for bridges with four active sensors and nonlinear for bridges with only two active sensors. This paper proposes...
Microcontrollers with embedded timers can directly measure resistive and capacitive sensors by determining the charging or discharging time of an RC circuit that includes the sensor. However, the same as classical signal conditioning circuits, these microcontroller-based interfaces are susceptible to power supply interference. This susceptibility is analyzed herein by using theoretical and experimental...
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