[Lab] simple 5.5V<->3.3V interface for 1-wire
peters-modlab at techwiz.ca
Tue Dec 25 11:37:26 EST 2012
On Mon, 2012-12-24 at 11:57 -0500, Richard Guy Briggs wrote:
> On Mon, Dec 24, 2012 at 11:41:01AM -0500, Peter Sjoberg wrote:
> > what's the safest way to read 5V with raspberry pi's 3.3V
> > unbuffered input short of buying some chip?
> A voltage divider will easily do that.
> / 10k
> 5V +----------
> / 18k
> \ 3.3v
> Use proportionately higher values if there is too much loading on your data
I know enough basic electronics to know about a resistor voltage divider
about but I forgot one important detail in my question - bidirectional.
I don't think I can send 3.3V out and get 5V and if I put >5V with
resistor somewhere I above I have to think a bit about values, currents
and so on to not interfere with the signal.
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