• 10 dec 2017: forum version update. In case of issues use this topic.
  • 30 nov 2017: pilight moved servers. In case of issues use this topic.
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Band pass-filter (new version)
#81
Hi,

I received my kit too. I am not working with pilight atm I just want the raw data. I used an other receiver before but I felt like there was too much noise.

However I think I connected it correctly, attached a picture of pilight in (from attiny). Is this what it should look like? As there is still alot of noise coming in although it is low frequent indeed compared to the raw receiver connected.


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#82
It does not filter all noise, it just reduces it a lot.
 
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#83
(06-23-2015, 08:18 PM)curlymo Wrote: It does not filter all noise, it just reduces it a lot.

Yes that was what I assumed. But now when I read out the pin the chance is 50/50 it reads back a false 1...
 
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#84
No, because valid signals will 99% of the case overrule invalid signals.
 
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#85
(06-23-2015, 10:40 PM)Korrupt Wrote:
(06-23-2015, 08:18 PM)curlymo Wrote: It does not filter all noise, it just reduces it a lot.

Yes that was what I assumed. But now when I read out the pin the chance is 50/50 it reads back a false 1...
pilight is fetching all signal status changes on the GPIO input line via interrupts.

As with all General Purpose Filters, there is a chance of reading back false bits, as the output of each filter is modified, however the problem is caused by missing or weak 433MHz RF input signals, combined with problematic behaviour of the 433MHz receiver.

The wiki provides more information in the electronics section.
 
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#86
Hi there,

I have been using the band pass filter for a while now. In my config.json I have the option to set values for lpf and hpf. Recently this is not part of the default config.json. What do these values mean and do they have an effect on the filter? Can I change the sensitivity of the filter using these values?

Thx

Teddy
 
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#87
Those values cannot be set, they are received from the filter and stored for future references.
 
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