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Yes, the temperature sensor does exactly what you want using the one-wire protocol.

Also, look at this http://openenergymonitor.blogspot.co.uk/2012/08/reading-watt-hour-data-f... which uses the pulse input.

let's hope it's not serial data he want's to read... and worse if he wants to ways serial com with the external device..

given up on figure that one out for the emontx myself

Others have successfully implemented serial input, if you cannot do it, it does not mean the everybody is the same.

There is a pulse input on the standard board which is designed to read a digital value, i am using it to read rpm for a heat pump. My experience is that its more difficult to read exact ad values with current emontx scripts.

nope it does not mean that... i have seen threads about input only but it will be another thing for meters that require a request before they output anything.

Thanks to all for reply.

My goal is to read a digital value that comes from an alarm system.

If value is true means that my allarm is active otherwise is turned off

I not need to read a serial data, I need to read only one value

hmm... i think you can use the pulse input... of course it will require a small mod so it does only report either on or off..

the pulse i normal used to messure things like water or electricity that gives 1 pulse for every liter or kwh (in most cases it requires more pulses to say 1 liter etc)

if you used the pulse input without mods you will only have a pulse when alarm is activated or turned off.. of course it would work somehow but you would have to go back and figure if the alarm is on or off instead of a simple value of on or off

By digital value, do you mean a voltage out on the alarm?  If so then if you can adjust it to provide a suitable input voltage for the emontx (not sure if has to be 3.3v or if 5v will do).

This page http://openenergymonitor.org/emon/emontx/reference%20  gives the pin uses of which Digital 5, 6 and 7 could be used for 'if pin HIGH = alarm triggered'.

This page http://solderpad.com/openenergymon/emontx/  should help you identify the pins, but they are the pads set out to be compatible with the Jeenodes.

Maybe you mean something else though?

Dennis

Thanks,

For summary

Digital 5, corresponding to pin 11 that is connect to CT3 connector is free

Digital 6, corresponding to pin 12 that is connect to AC-DC 9 V measurement, connector already in use

Digital 7, corresponding to pin 13, that is connect to to CT1, connector already in use

Digital 4, corresponding to to pin 6, that is connect to temperature measure, connector is free

If I understand correctly I can use Digital 5 or Digital 4, correct?

On  P1 is connected also the CT2 connector, if I use the Digital 4, is compromise CT2
read ?
Thanks

Not from how I read it, unless you mean you have built/designed your own board?

If using the OEM Emontx then:

Digital 5, 6 & 7 are all free, and ready setup to use the Jeenode layout.

CT3 is connected to Analogue 1/ Digital 15/Pin 24 which can be used if you don't use CT3, but as there already unassigned pins then why use it - maybe you want to make use of the available jack?

9v AC input is connected Analogue 2/ Digital 16/Pin 25.

On P1 the digital port is in use, but it is the One Wire Temperature input.

Dennis

Sorry but perhaps I wrong to read a schema.

If I understand if something use the pin AIO of PX connector, this is in use. I look a DIO pin of PX connector.

If it is connect where, in the schema, I connect my cable to read a input?

Thanks