As mentioned in class, you don't want your sensor to be temp dependent due to capacitor value changes. C0G: upto 30 ppm/degrees C X7R: upto +15% over temp range X5U: +22%, -56% (not suitable for resonant circuit) Z5U: " Y5V: really bad for temp stability Please check out: http://www.kemet.com/kemet/web/homepage/kechome.nsf/weben/6FB56FCB5EBB9053CA2570A500160913/$file/F3101ECerLdPerfChar.pdf for all the gory details -- Prof. R.S. Fearing Dept. of EE&CS 265M Cory Hall University of California Berkeley, CA 94720 phone (510) 642-9193 http://robotics.eecs.berkeley.edu/~ronf
