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Unformatted text preview: EE 4770 Homework 4 Due: 7 April 1997 Design a system to convert strain x 2 ,0:0001; 0:0001 to a oating point number
given by H x = 1:3x to be written to variable scaled strain using strain gauges with response
Ht = R0 1 + 2 , where R0 = 150 . Strain gauges can be mounted to obtain complementary
responses; there is room to mount as many strain gauges as needed.
Design the circuit assuming that arbitrary voltage sources are readily available e.g.,
1:14285714285714285 V and strain gauges are inexpensive but opamps and instrumentation ampli ers are expensive. Use four strain gauges. Problem 1: With a skitype exercise machine an exerciser uses his or her feet to slide ersatz skis
back and forth. Tracks limit the skis' motion to one axis the direction of simulated travel; the
exerciser is held in place by a waistheight cushion. The skis are two meters long; assume that
both skis cannot simultaneously move backward. De ne simulated skiing distance to be the total
backward distance that both skis travel. Using twoway coded displacement transducers, design
a system to convert simulated skiing speed x 2 0; 40 km=hr to an integer, H x = x km1=hr . The
solution should not include a computer, instead it should use logic gates, registers, adders, etc., to
convert the CDT output to the speed. Be sure to specify the spacing and number of marks on the
CDT, counter and registers sizes, the frequency of any clocks used, and any other relevant details. Problem 2: ...
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 Fall '99
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