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Showing results for tags 'Analog input sensor'.
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I want to measure the frequancy of a IR beam interrupted by a spinning fan blade. I am usieing an MSP430G2553 Here is a link to the sensor circuit. http://www.dickbrom.com/circuits/dark.jpg The voltage across the Red Led varies from 1.0 volts to 2.0 volts depending on the beam being interrupted or not. Can I connect the emitter of the 2n2222 directly to an analog input pin and the battery minus to the launchpad ground pin? There are a few Energia programs that show hot to compute the frequency. Thanks