Analog ?

Joe McCarron

Hello Gents,

I am looking to get back into my microcontroller hobbies.
The propeller looks to me to be something alot different than anything I've used before.
Going over the docs I/O is general purpose (ie digital).
My question is how is analog I/O dealt with?
The docs said that the counters can do Ang I/O but I dont see how.
Can anyone point me in the right direction.

Thanks
Joe

Leon

You can either use an external ADC, or sigma-delta conversion with a couple of resistors and a capacitor.

Leon

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beebs

Joe,
Welcome to the forum.
Check this thread: http://forums.parallax.com/forums/default.aspx?f=25&m=115264
This is Chip's explanation of using the sigma-delta method Leon was referring to (there are others more recent also).
There are quite a number of examples in the Object Exchange (http://obex.parallax.com) for using different external ADC chips.

- beebs

SRLM

The sole application note: www.parallax.com/Portals/0/Downloads/appnt/prop/AN001-PropellerCountersv1.1.zip

mynet43

If you want to use external ADC, it's easy to hook up an MCP3208, which gives 8 ADC ports.

There are several good drivers for this in the Object Exchange.

Jim