Electronics > Beginners
Extremely low bandwidth between 2 radio modules
epigramx:
--- Quote from: Buriedcode on March 23, 2019, 02:48:57 pm ---I thought Lora modules with 100mW output could do a couple of km? I know the spread-spectrum adds a fair bit of coding gain at the cost of through-put.
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Yeah I mean it's partly marketing though. e.g. for this model they advertise 3000 meters but they also mention in the small print, if the antenna is 5dbi (small ones people use are barely 2.5dbi) and at 2 meters height, and with no obstacles in view.
I'll be happy if I get 500 meters with average equipment to be honest when some minor/medium obstacles are inbetween.
[Ah, and they say if the bandwidth of air com is 2.4kb(bit!)s which is extremely low for many applications.]
epigramx:
--- Quote from: helius on March 22, 2019, 06:37:47 am ---All data links need to implement flow control, unless the source of data is strictly less than the worst-case channel throughput.
This module appears to provide an AUX pin that can be used as a CTS (clear to send) signal.
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Thanks for that info, I was wondering what that AUX shenanigans was for and most people dismiss it with "just leave it floating". However, it's not entirely unreasonable to leave it unused if a specific application has determined in most realistic scenarios won't have congestion issues (though I understand it's best for something commercial to not leave it unused).
[PS. In my particular personal project it won't have an important use beyond initial testing because the bandwidth required is relatively reproducible and with a max that is relatively constant, and in any case I would have to alter the sender software which is a third party creation and I'm not willing to delve into that.]
[Actually, it's pretty cool to use it for a led indicator, so there's that.]
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