12-08-2017, 09:55
Hi,
It's important to remember that 434 MHz is a shared radio frequency, used by many other commercial systems (I have nearly 10). The typical transmission period for "repetitive" systems (temperature senders, etc.) is one minute, or much longer for wireless doorbells and garage door openers, etc. So 3 seconds is already rather fast and 1 second would probably "kill" most of the other available systems, because of all the "collisions" between data packets from different sources.
But of course the "transmission" and "measurement" times do not need to be the same. The humble "Fine Offset" weather stations transmit only once every 48 seconds, but the data packet contains an "average" wind value (obviously over the 48 seconds period) and a "gust" value, which is the maximum of 24 values measured in two-second intervals.
I don't know how the Weatherduino data/protocol is organised, but obviously a (separate) "gust" value would allow the transmitter to calculate a (maximum) value over as small a period as desired (or at least practical).
Cheers, Alan.
It's important to remember that 434 MHz is a shared radio frequency, used by many other commercial systems (I have nearly 10). The typical transmission period for "repetitive" systems (temperature senders, etc.) is one minute, or much longer for wireless doorbells and garage door openers, etc. So 3 seconds is already rather fast and 1 second would probably "kill" most of the other available systems, because of all the "collisions" between data packets from different sources.
But of course the "transmission" and "measurement" times do not need to be the same. The humble "Fine Offset" weather stations transmit only once every 48 seconds, but the data packet contains an "average" wind value (obviously over the 48 seconds period) and a "gust" value, which is the maximum of 24 values measured in two-second intervals.
I don't know how the Weatherduino data/protocol is organised, but obviously a (separate) "gust" value would allow the transmitter to calculate a (maximum) value over as small a period as desired (or at least practical).
Cheers, Alan.