On Fri, 26 Feb 2021 15:50:17 +0000, Folderol wrote:

> On Fri, 26 Feb 2021 14:32:14 -0000 (UTC)
> Martin Gregorie  wrote:
>
>>On Fri, 26 Feb 2021 05:17:11 +0000, A. Dumas wrote:
>>
>>> There are 16 pwm channels on the rp2040 chip which can be connected to
>>> any gpio. I'm sure that's still the same on the Tiny. So you have at
>>> least 8 pwm pins, or 11 if you count the rgb led. Not sure if the 4
>>> adc pins can be reconfigured to be digital pwm, but I don't think so.
>>>
>>Thanks for the correction - I just looked at the pretty picture and, not
>>seeing PWM among all the other coloure blobs, thought it wasn't
>>available.
>>
>>> (The Tiny has one more adc pin than the Pico because it lacks the
>>> buck-boost and hence the need to monitor the input voltage. Like
>>> (many/all/most?) small mcus, by the way, there is just one adc and the
>>> 4 pins are multiplexed.)
>>>
>>Does this mean that, if I put 5v on pin 1 I'll see 3.3v on pin 3, but
>>the reverse doesn't happen?
>
> That was the impression I got, doing a fairly rapid skim of the data.

Close enough
Putting poweing the 3v pin will not get you a 5v output form either board.

The pico has a pin - VSYS which is connected to a Buck/boost converter &
will accept 2V to 5.5V & regulate it to the required V3.3 (this will be
great for battery powered equipment)

The Tiny does not have this pin (or type of regulator) so does not need
to use one of the ADC pins to monitor & control it



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