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This paper proposes the use of Vernier technique to improve the performance of direct interface circuits based on measuring the charging or discharging time of an RC circuit that includes the sensor. The proposed Vernier technique either improves the resolution determined by quantization of the digital timer or reduces the cost, measuring time, and power consumption of the circuit while preserving...
This paper proposes a simple and low-cost interface circuit for capacitive sensors that is insensitive to the parasitic conductance (Gx) of the sensor. Such a circuit relies on a previous circuit also proposed by the authors, in which the sensor is directly connected to a microcontroller without using analog circuitry between them. The novel circuit uses the same hardware, but it performs an additional...
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