On Tue, April 18, 2017 11:27 am, Tom Metro wrote:
. The manufacturer wouldn't even
> splurge on a micro with an analog input,
Two gpio pins, a resistor, a capacitor,
and a digital counter can get you a cheap
approximation of an ADC in a digital only micro.
Put cap and resistors in series
On Sun, Apr 16, 2017 at 9:33 PM, Tom Metro wrote:
> Greg Rundlett wrote:
>> I bought a house 6 years ago, and I was perplexed this week as ALL the
>> First Alert combo smoke + CO detectors started chirping and went bad.
>> The First Alert smoke detectors have and "End
On Mon, Apr 17, 2017 at 1:33 PM, Tom Metro
wrote:
> Federico Lucifredi wrote:
> > This excess life span I detected in use leads me to think the sensor
> > chemistry decays even when warehoused and not in powered use.
>
> Sure, that makes perfect sense given what we