Using arduino like a 4066 chip--for me, to clobber audio signals

Using Arduino General Electronics
1

Hi there:

not sure if this is the best place to post this....

I figure experienced Arduino users have seen this already but it was new to me, and a pretty cool thing.

It's a bit hard to explain so I put it into a Blog entry but basically using digital pins as grounds to stop analog signals from getting to the analog pins, then changing over to INPUT for hi-z and letting them pass.

It makes your Arduino into a very fancy and easily programmable 4066 or 4016 cmos chip?

but without having to worry about on resistance or how high the hi-z mode is.

I used this trick to create an accurate (within one percent or better? still tweaking) DVM that reads up to +/- 12V DC as well as RMS AC to about 5V.

You can read more here if you're interested, I'd like to know ways to improve etc.

Again not saying I discovered this, far from it, but am finding it really useful as I try to mix analog control and audio signals with arduino. Thanks!

2

clammo:
It makes your Arduino into a very fancy and easily programmable 4066 or 4016 CMOS chip?

Limited by use as a shunt connection, to ground or 5 V.

Interesting that the effective resistance of the ATmega328 is approximately 47 Ohms, and pretty much the same as a 74HC4066.

3

clammo:
Hi there:

not sure if this is the best place to post this....

I figure experienced Arduino users have seen this already but it was new to me, and a pretty cool thing.

It's a bit hard to explain so I put it into a Blog entry but basically using digital pins as grounds to stop analog signals from getting to the analog pins, then changing over to INPUT for hi-z and letting them pass.

It makes your Arduino into a very fancy and easily programmable 4066 or 4016 cmos chip?

You short the analog pin to ground - why is that any more useful than just ignoring its value?