A Multi-Channel Data Acquisition System for Capacitive Sensing

Abstract Capacitive sensing can be applied to a variety of applications. A multi-channel data acquisition system for capacitive sensing was designed based on an FDC2214 with external L-C resonators. The FDC2214 was used for capacitance-to-digital converting by measuring the ratio of the resonator frequency to a reference frequency. Employing MSP430F5529 as host processor and the two-wire I2C serial bus interface connected with the FDC2214, the system implemented multi-channel data acquisition. As a test system, an 8-channel physical hardware device was provided. Experiments for gesture recognition had been done using the 8-channel capacitive sensing data acquisition system. The good experimental results verified the availability of the designed system.