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Connection between pc and a microcontroller

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4) Why we need MAX3232 in the UART connection between PC and a microcontroller? 

5) How the minimum sample rate is defined for sampling a signal? What would be the sampling rate for a temperature, voice, and a video signals and why?

6) Suppose we are going to convert an ECG (Electrocardiogram) signal to digital that its amplitude varies between 1 V to 5 V and its maximum frequency is 200 Hz. The smallest voltage change that we have to measure is 10 mV. Define:

a. The minimum sampling rate?

b. Vref+ and Vref- and the minimum number of bits in A/D.

c. What would be the advantages and disadvantages of sampling the signal with a higher or lower frequency specified in (a).

Reference no: EM132415317

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