EE
hw 04 - Sensors, Signal Conditioning, ADC.pdf

Strain or force in quality assurance process control

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strain or force in quality assurance, process control and development across many different industries. The required dimension of a piezoelectric load sensor by design is Diameter x Thickness = d x t = 0.7 in x 0.4 in What must be the sensitivity of a piezoelectric sensor to accurately measure 10 lb load? Induced voltage is to be no less than 500 mV
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3 Design Problem 4 ( Signal Conditioning ) Design a signal conditioning circuits to convert sensor voltage input -100 mV to 100 mV to the range 0V to 5V. Design Problem 5 ( OpAmp Level Shifting and Scaling ) V IN is a 1 kHz small-signal variable-sign harmonic (sinusoidal) signal of amplitude 100 mV. Design a circuit that would shift and scale V IN so that it oscillates between 1.0 V and 2.0 V (that is, of amplitude 500 mV). Design Problem 6 ( Configuration of HCS12 A/D Converter ) (E12.8 ) Write an instruction sequence to configure the HCS12DP256 A/D converter with the following characteristics: f OSC = 8 MHz Channel AN0~AN3 A/D result left-justified 8-bit resolution, unsigned result, continuous conversion Four conversions in a sequence Prescaler set to 2 Four cycles second stage sample time, non-FIFO mode Enable fast ATD flag clear, enable ATD interrupt External falling edge triggered (at ATD7 pin) Finish current conversion then freeze in background debug mode V IN V 1 R 1 R 2 R f - + +12 V - 12 V 741 - + +12 V - 12 V 741 R 0 R 0 V OUT V OUT - (12-5) R f R 1 R 2 R f = V 1 V IN Figure 12.7 Level shifting and scaling circuit V M V M = - V IN
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