Do you have an external antenna attached to the receiver? What kind of receiver do you use?
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Kabelloser Bewegungsmelder PIR
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I am using a cheap (1 EUR) pair of Tx/Rx modules. The transmitter is good, the super regenerative receiver
however is a bit crappy: without antenna the reach is maybe no further than a meter, but even with
a 17,2cm long antenna (a wire) it is marginally more, round about 2-3m, even with free line of sight.
Now I ordered a super heterodyne receiver (rx6). -
@alter_knochen said in Kabelloser Bewegungsmelder PIR:
now I ordered a super heterodyne receiver (rx6).
Yes, that will work much better.
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@alter_knochen said in Kabelloser Bewegungsmelder PIR:
Now I ordered a super heterodyne receiver (rx6).
Good choice.
I also recommend to use capacitors to denoise the power rail. See the following page for details (a bit further down, section “RXB6”): http://www.rflink.nl/blog2/wiringIt is also better to have a shielded version of the receiver.
"It always takes longer than you expect, even when you take into account Hofstadter's Law.", Hofstadter's Law
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Now I have found a good instruction how to make a 433MHz (air cooled) antenna.
–> http://www.byvac.com/downloads/RLnn/How-to-make-a-Air-Cooled-433MHz-antenna.pdf
Many people confirm to the author of this instruction that it dramatically increased the range of the cheap
Tx/Rx pair. The distance (with the cheap receiver as well as the transmitter) that can be covered easily goes
to 25 m with line of sight, but also in-house the distance will be increased reaching other rooms with concrete
walls in between, were earlier 3 meters with line of sight would be pushing the limits already. Says one of the
testers …I will try it.
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I bought two of those antennas and soldered them to my sender/receiver. No difference between a single wire and an “antenna”.
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Currently testing the Xiaomi PIR, and I have to say : I’m impressed. Very good stuff, a smart PIR that knows when and what to send. The lux transmission is also a plus.
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@koffienl
I totally agree with you - a great device.
But I was surprised about the brightness sensor - I didn’t get any data.
Until I noticed that there are 2 versions - one with and one without brightness sensor.Greetings
Revo -
Correct, the v1 dose not have a lux sensor, the v2 does.
How do you gather data from the gateway? If you are able to see the realtime traffic that your program/script/plugin/whatever receives from the gateway you should see something about the version of the sensor and, if it does send, the lux.
Modelname of my v2 sensor issensor_motion.aq2
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Although I have made up my mind to move to the Xiaomi devices, the test is still running.
The cheap Chinese PIR’s are still functioning on their ‘low battery’ mode. the one in the living room has 22102 hits registered in the past 50 days.
I have a Chinese PIR in the hallway, about 1 meter above my RF receiver (receiver behind wooden door/wall), but still sometimes issues with reception - even with the antenne a bit retracted.
Pimatic is programmed to turn on some lights in the morning when some requirements are met.
When I walk down the stairs in the morning I see the red LED on the PIR noticing my movement. But nothing happens. Usually I stay a few seconds in the hallway to disarm my alarm. Enough time for a second detection. Most of the time the second detection is picked up by RF and the lights turn on.
I have not seen this kind of reception issues with the Xiaomi PIR, while the distance between PIR and 2.4Ghz gateway is much more compared with the PIR in the hallway.Waiting for another 2 xiaomi PIR’s on transit from China
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