OT: Wireless doorbell signalling resolved
- From: Steve Thackery <nobody@xxxxxxxxxxx>
- Date: Sun, 20 May 2012 18:06:22 +0100
With reference to the thread "Best length of wire?", and if anybody should be mad enough to try, here is what I had to do.
Just to recap: I'm using a wireless doorbell to transmit a timekeeping signal around the house every 30s.
The problem: intermittent missed signals by the receiver. You guys made some great suggestions, and one of them led to the solution.
The first step was to try a more sophisticated and longer range (100m) doorbell unit. The end result was exactly the same. Thus I concluded that it probably wasn't a range/weak signal problem; rather that the signal was intermittently clashing with other signals on the same frequency (e.g. my three wireless room stats).
The solution is far from elegant, but it seems to work. I now send three transmissions spaced apart over a period of ten seconds. The plan is that at least one of them will get through without clashing.
At the receiver end I ignore the receiver for twelve seconds after receiving a valid signal. This prevents retriggering on the second and/or third signals when the first signal is correctly received.
Obviously if it doesn't trigger until the third transmission is received, the twelve second timeout is wasted, but does no harm. The receiver is "re-armed" in plenty of time for the next 30s pulse.
I never imagined it would be this hard!
Thanks again for your advice.
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