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Can someone give me an estimate on how much these locks cost?

I'm using these: http://iteadstudio.com/store/index.php? ... ucts_id=53

Regarding code, if you can read a datasheet, you can write the code too, thats how I do it for code-less sensors

Erisan, which sensor are you using and what is the range that you are getting? Sensor for what? I use mostly OneWire sensors, but also Hall-Effect sensors. Depends on what you wanna measure. Regarding the range, i didn't do any tests, but my home is about 20 by 10 and i have no reception problems. ...

I use 2.4Ghz RF modules that can send at 2Mbit, and they cost 2,9€, and thats what i've settled on.

XBee is very nice, but way too expensive

Looks like domoticans are not interested in .Net hardware...shame, shame, shame....

Have a look here: http://blog.hekkers.net/2010/12/04/the-allegro-a3214-hall-effect-switch/#comment-5551 If you want to continue using the CNY70 you really need this: http://www.domoticaforum.eu/viewtopic.php?f=23&t=111&p=16944&hilit=cny70#p30383 I tried your above schematic too in the pa...

I just get "This photo has been removed"

Post a pic of your gasmeter and I'll tell you a if it's possible to use a much more reliable way to count the pulses

No, and I'm not going to look at it seen that SoftwareSerial is working well.

For those interested: http://wiki.vdbnet.net/doku.php?id=rfid

Would you mind posting your sketch so i can compare where the possible mistake is?

Are you sure that the TagID you read corresponds to the TagID written on the tag? OK NODE=1 TAG=41003D948F67 I have the exact same reader, but the id's i read don't correspond to whats written on the tag itself. I found the solution here maniacbug.wordpress.com/2011/10/09/125k ... le-rdm630/ but it ...

Usualy it is an Open Collector output. In the manual/datasheet/mounting instructions, you should be able to find the allowed voltage range you can use, but consider 5V as safe.

I've build my own pulse counter for electricity, water, gas with a Fez Panda (+/-25€)

Use shielded cable, that protects you better from EMI interference. I saw the same problem with UTP CAT5. You can use CAT5 cable in some environments but you have to use them in pairs (ex: orange +5V, orange/white GND, blue sensor, blue/white GND)