Quantcast
Channel: Raspberry Pi Forums
Viewing all articles
Browse latest Browse all 4799

Beginners • Re: Multiple devices to the same ADC Input

$
0
0
You are assuming that a powered-down device will have a well-defined (and preferably very high) resistance between the output and ground.

In general, this isn't true; if you apply a signal to a pin of an unpowered device, then undefined (and possibly damaging) things will happen; for example, the device may try to power itself up from that signal, in which case the current flow will be highly device-specific, with a very non-linear relationship to the applied voltage.

Just use an analog multiplexer.

Statistics: Posted by jayben — Sat Jul 06, 2024 9:58 am



Viewing all articles
Browse latest Browse all 4799

Trending Articles