Re: [HH] CO detectors self-destruct

2017-04-19 Thread Greg London
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

Re: [HH] CO detectors self-destruct

2017-04-18 Thread Bill Bogstad
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

Re: [HH] CO detectors self-destruct

2017-04-18 Thread Greg Rundlett (freephile)
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