The best way depends on your specific circumstances.
You can use an external analog to digital converter of which there are many.· There are several objects in the Propeller Object Exchange that take care of interfacing to these.
You can use the built-in sigma-delta analog to digital conversion techniques described in the AN001 application note on the cog counters (see the Propeller downloads).· There's an object in the Propeller Object Exchange that provides analog to digital conversion using this mechanism.· Download it and have a look at it.
virtualcp
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You can use an external analog to digital converter of which there are many.· There are several objects in the Propeller Object Exchange that take care of interfacing to these.
You can use the built-in sigma-delta analog to digital conversion techniques described in the AN001 application note on the cog counters (see the Propeller downloads).· There's an object in the Propeller Object Exchange that provides analog to digital conversion using this mechanism.· Download it and have a look at it.
In the 0-5V range, U can mess around or buy an IC... ADC0831 gives about 8 bits, has a nice object, is well documented and a dream to use.