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# fe - Name Real Time Computing Systems EE 4770 Final...

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Name Real Time Computing Systems EE 4770 Final Examination 7 May 1999, 10:00-12:00 CDT Alias Problem 1 (25 pts) Problem 2 (25 pts) Problem 3 (25 pts) Problem 4 (25 pts) Exam Total (100 pts) Good Luck!

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Problem 1: Design a system to convert process variable x [0 , 2000 N], force, to a ﬂoating point number H ( x )= x/ N, to be written to variable force . Force is to be measured using a load cell with four strain gauges mounted. Force is converted to strain so that ± = H tfs ( x ± ( xk 1 + x 2 k 2 ), where k 1 = 1 . 100 × 10 - 7 N and k 2 = 2 . 420 × 10 - 11 N 2 . The sign is based on where the strain gauge is mounted, two are positive and two are negative. The strain gauges are ideal; their model function is H t ( ± ) = 1000 Ω(1 + 2 ± ). (25 pts) Use a 10-volt, 16-bit ADC. Choose a conditioning circuit appropriate to the strain gauge responses. Show all component and supply values. Write the interface routine. Do not expect a symbolic equation solver to be linked in with the real-time program. Indicate the minimum precision of force . The answer can be given as a formula, be sure to indicate which values to substitute. Justify your answer.
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fe - Name Real Time Computing Systems EE 4770 Final...

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