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This paper introduces MicPen, a low-cost pressure-sensitive stylus pen interface for standard touchscreen displays that uses a microphone to estimate the amount of pressure applied to the pen. This is achieved by filtering and analyzing the acoustic signal generated when the tip of the pen is rubbed on the touchscreen. The advantage of this approach is that it is inexpensive, reliable and suitable for mobile interaction because it does not require mechanical parts to sense the input pressure. Results from a user study shows that the participants recognized five out of ten different pressure levels with perfect accuracy, and nine out of ten with minimal error.