RS485 Wind direction transmitter Arduino library
MazinNasser 2022-04-25 02:51:58 1138 Views3 Replies Hello
I'm trying to do the RS485 wind vane transmitter project, link https://wiki.dfrobot.com/RS485_Wind_Direction_Transmitter_SKU_SEN0482
But the Arduino library doesn't open up when clicked, but refreshes the page. Is there any way to get the zip folder for the library?
Thank you
Just a note: I am running the wind direction transmitter and at least my transmitter returns valid data in two bytes, which I use for high res. output of the direction. The response is not totally linear. A have checked the response at different angles and use a correction with a 2nd order polynomial function. Then one can use the data, correct it and gets a nice ~11-12 bit resolution for the wind direction.
I am using Python with a Raspberry Pi.
Example: for the command: [0x02, 0x03, 0x00, 0x00, 0x00, 0x01, 0x84, 0x39]
I read the 7 Data bytes return
and use the bytes: x = (Data[3] * 0x100 + Data[4])
correct them by: WindDirection = -3E-6 * x^2 + 0.1098 * x + 0.1412 (this calibration has to be done probably for each device)
which gives a high resolution wind direction.
To get an index 0-15 I use: idx = round(WindDirection / 360 * 16)
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