Re: X10 device to detect open circuit or voltage drop

["Bob F" <bobnospam@xxxxxxxxx>]

codepug@xxxxxxxxx wrote:
> On Nov 1, 1:11 pm, nob...@xxxxxxxxxxxx (Dave Houston) wrote:
>> "Greg (code...@xxxxxxxxx)" <code...@xxxxxxxxx> wrote:
>>> Which X10 device would be used to detect a low voltage drop, or
>>> open circuit ? It seems that the powerflash does the reverse.
>>
>> It might help if you tell us the specifics of what you want to do.
>> No X10 module is designed to do exactly what you want but we may be
>> able to come up with suggestions on how to use them or other devices
>> to accomplish your goals.
>>
>> For example, many of the Smarthome modules will send an x10 code
>> when the load they control is turned off.
>
> I have snap style temperature sensors that are normally closed. I want
> to detect when the
> circuit opens, and be able to send an x10 signal to a red light. The
> problem is that the
> powerflash module only sends a lights ON signal when a circuit closes.
> I do not have a
> computer available in this location to interpret an OFF signal to mean
> ON. What are my options ?

You could use a resister in series with the sensor, fed by a power supply, with
the powerflash module wired across the sensor. Thus, it will get voltage when
the sensor opens.