Recent content by n4hc

  1. N

    Elk M1 Humidity sensor

    Good job! I'm not familiar with that micro or language.   I know you need some time between transmissions but not too much.  I wait about 10 seconds between sending readings (if I remember correctly).   That could explain the flashing zone on your keypad.
  2. N

    Elk M1 Humidity sensor

    I posted a blog entry with the protocol description and demonstration code for a humidity sensor. http://cocoontech.com/forums/blog/43/entry-393-elk-m1-zone-temperature-sensor-protocol-decoded/
  3. N

    Elk M1 Humidity sensor

    It's a 1 bit per second datarate. he blinking light on the temperature sensor is the actual data. Bit-banging is the best and easiest way to go. I'm still looking for the code but I think it's about 480ms per 1/2 bit. And it MUST be connected to the main input zones directly on the Elk...
  4. N

    Elk M1 Humidity sensor

    I hear that's encrypted. Makes sense that it's secure for a security system... But it's RS485 if anyone wants to give it a try.
  5. N

    Elk M1 Humidity sensor

    Thanks everyone for the interest. My plans have changed so at this time I can't build this as a product so I'll post what I have and make this open source. Who knows what cool stuff can be built if we open this up and let people create. The protocol is pretty simple. It's Manchester encoded...
  6. N

    Elk M1 Humidity sensor

    Todd, We've been delayed. A lot of work and personal stuff getting in our ways. Hardware design is pretty much done but trying to find the right packaging is hard. I found this: http://www.instawares.com/p-o-d.big-180.0.7.htm which is pretty affordable but is large. Any thoughts... Thanks, Joe
  7. N

    Elk M1 Humidity sensor

    We are actively developing the sensor now. We ultimately will be making this a wireless sensor in a nice (wife approved) package that you can just stick on the wall like a thermostat. A wired sensor is easier and will be lower cost. How much interest is there in the wired vs: wireless sensor...
  8. N

    Elk M1 Humidity sensor

    Thanks for all the input. I'm working with a friend to get this design together. The hardest part is finding a suitable enclosure. At this time I'm leaning toward something that can fit into a standard Decora plate. (of course, any other suggestions are welcome) We may also produce the unit...
  9. N

    Elk M1 Humidity sensor

    I definitely agree. Having "humidity" in the rule name would be good. And for light, that can be done now via any zone (expansion too) programmed as analog. Just need a light dependent resistor and appropriate divider network. Very inexpensive. (few $) Would read back as voltage though...
  10. N

    Elk M1 Humidity sensor

    Thanks. M1 zone 1-16 is required since these are the only zones that support temperature sensors. The data is transmitted digitally at a very low bit rate and these are the only zones that can accept the data. No ELK support is needed for rules since it looks like a temperature sensor to...
  11. N

    Elk M1 Humidity sensor

    Call sign. Ham radio. (not a valid chemical formula) Yes, I've reverse engineered the protocol and I have thought about using this for anything else that can be represented in a "normal" temperature range as seen by the Elk. Your rules would still use "temperature" but you would know that...
  12. N

    Elk M1 Humidity sensor

    No firmware support needed. It looks like and connects to the system exactly like an Elk temperature sensor. Don't know about making it flush mount. There is the same amount of support circuitry as the temperature sensor. The package for that would be at least the same size. Perhaps...
  13. N

    Elk M1 Humidity sensor

    I have developed a prototype for this and it has been working for over a year without a hitch. This device works like an Elk Temperature sensor and connects to one of the base zones. I am looking to see if there is an interest for this type of product. Since I haven't produced a stand-alone...
Back
Top