I've been wondering about something. (still a beginner bear with me).
When using digital inputs we tend to put a current limiting resistor on the pin to prevent it from damage.
Anyway, I was looking at trying to get a readout of my cars throttle sensor (has a convenient range of 0-4.5v), however - since the throttle potentiometer (pedal) is technically a variable resistor, won't a current limiting resistor affect teh voltage?
I know this is probably a dumb question but I don't want to cook anything, or affect my accuracy either (been there, done it).
I've with-held answering this question for a while now, I was hoping to find a circuit diagram I could look at, but not found anything that uses an 'external sensor' (i.e the tps has it's own power supply, though we do share a common earth as the pic will be powered off the same batt).
Anyway, just wondered if anyone can clear up the confusion about how ADC is actually wired up.
I suppose the question is 'how do you tap into the sensors of other devices'.
When using digital inputs we tend to put a current limiting resistor on the pin to prevent it from damage.
Anyway, I was looking at trying to get a readout of my cars throttle sensor (has a convenient range of 0-4.5v), however - since the throttle potentiometer (pedal) is technically a variable resistor, won't a current limiting resistor affect teh voltage?
I know this is probably a dumb question but I don't want to cook anything, or affect my accuracy either (been there, done it).
I've with-held answering this question for a while now, I was hoping to find a circuit diagram I could look at, but not found anything that uses an 'external sensor' (i.e the tps has it's own power supply, though we do share a common earth as the pic will be powered off the same batt).
Anyway, just wondered if anyone can clear up the confusion about how ADC is actually wired up.
I suppose the question is 'how do you tap into the sensors of other devices'.
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