Documentation update request - analogRead()
i stumbled on answer after rewiring 5 times, testing serial printing , scouring web 3 hours.
when mixing several analog sensors 1 or more high impedance, seems multiplexer takes bit stabilize when analog reading several pins in row.
this seems common issue new users trying mix photocell tm35 temperature sensor.
http://forums.adafruit.com/viewtopic.php?f=24&t=11597
i suggest noting effect on documentation page analogread()
something "when using more 1 analog sensor, may need analogread() pin twice, delay (10) in between stable output numbers. first analogread forces adc select pin , delay lets value stabilize second reading more reliable. "
when mixing several analog sensors 1 or more high impedance, seems multiplexer takes bit stabilize when analog reading several pins in row.
this seems common issue new users trying mix photocell tm35 temperature sensor.
http://forums.adafruit.com/viewtopic.php?f=24&t=11597
i suggest noting effect on documentation page analogread()
something "when using more 1 analog sensor, may need analogread() pin twice, delay (10) in between stable output numbers. first analogread forces adc select pin , delay lets value stabilize second reading more reliable. "
the avr analog input pins work best when output impedance of signals wired analog input pins 10k ohms or less. method handling higher impedance signals wire .1 ufd cap input pin ground, lower impedenace internal adc 'sees'.
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