Electronics > Beginners
Extremely low bandwidth between 2 radio modules
epigramx:
I seem to be getting extremely low bandwidth (with uart at 115200 and rf at 19200) when trying to receive a stream of gnss data, distance not being the problem, with two e32-ttl-100 modules. Do I miss something basic like having to change default channels?
Benta:
What do you mean by low bandwidth?
The signal from the satellite is only 50 baud, so the utilization of a UART port is of course low.
epigramx:
--- Quote from: Benta on March 21, 2019, 04:40:20 pm ---What do you mean by low bandwidth?
The signal from the satellite is only 50 baud, so the utilization of a UART port is of course low.
--- End quote ---
No, that has nothing to do with gnss, the satellite data are plentiful locally. I'm talking about radio linking only (the data might as well be any arbitrary text).
PS. "the satellite is only 50 baud". No, that's not how gnss modules work, they combine multiple satellite data etc.
epigramx:
Nevermind, it turns out my problem is of a different nature entirely. Apparently my confusion came from the fact that since the radio modules have an extremely low buffer size (512 bytes if I'm not mistaken), if the UART rate is not the same with the radio rate, it usually drops data without warning!
helius:
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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