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Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.

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Using rotary encoders with no interrupt pins

Have you considered polling very fast and strobing a pair of 71451s with four separate addresses to get the pair of inputs you need, in round-robin (but very fast) fashion? You could then read one bi …
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2 votes
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Issue reading pressure transducers and getting floating value

The analogRead() method returns an integer between 0 and 1023 on a 0-5V swing. Your transducer produces a 0.5V - 4.5V range (from the datasheet you linked to). That's a 4V swing. So analogRead() can …
TomServo's user avatar
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2 votes
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Switching low power with transistor

A more standard value will be 4700 ohms, it little lower drain on the Arduino pin and a bit less delivered current with the PN2222's beta. … Keys to look for are: Limiting bias current from the Arduino to the base of the transistor. …
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