💬 Connecting the Radio
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Little mistake in the text, I don't think dupont cables are made of bread.
"the antenna need to be single core inside, only one wire, not multi-wire breaded like you can find in common dupont cable (not good for antenna.)"
should be
"The antenna need to be single core inside, only one wire, not multi-wire braided like you can find in common dupont cable (not good for antenna)" -
Little mistake in the text, I don't think dupont cables are made of bread.
"the antenna need to be single core inside, only one wire, not multi-wire breaded like you can find in common dupont cable (not good for antenna.)"
should be
"The antenna need to be single core inside, only one wire, not multi-wire braided like you can find in common dupont cable (not good for antenna)" -
@nitroburn thanks! I've updated the page.
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@mfalkvidd No problem, did make me a little hungry though.
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Can anyone change the text for "Configuring MySensors for RFM69". When you want to use another pin for cs it´s not this code:
// #define RF69_SPI_CS 15 // If using a different CS pin for the SPI bus
but this
// #define My_RF69_SPI_CS 15 // If using a different CS pin for the SPI bus
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Can anyone change the text for "Configuring MySensors for RFM69". When you want to use another pin for cs it´s not this code:
// #define RF69_SPI_CS 15 // If using a different CS pin for the SPI bus
but this
// #define My_RF69_SPI_CS 15 // If using a different CS pin for the SPI bus
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Nrf24l01+ also drains less current when sleeping vs RFM69 -
@joseyapor neither is better. They are good at different things. See https://forum.mysensors.org/topic/3993/nordic-or-hoperf-radio/2 for an earlier discussion.
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@Grave thanks for pointing this out. From looking at the source code, it looks like it should be MY_RFM69_CS_PIN. I have updated the text. Could you check if I got it right?
@mfalkvidd said in 💬 Connecting the Radio:
@Grave thanks for pointing this out. From looking at the source code, it looks like it should be MY_RFM69_CS_PIN. I have updated the text. Could you check if I got it right?
It looks like that MY_RFM69_CS_PIN is used only in develop branch.
Stable brach still using MY_RF69_SPI_CS. -
@mfalkvidd said in 💬 Connecting the Radio:
@Grave thanks for pointing this out. From looking at the source code, it looks like it should be MY_RFM69_CS_PIN. I have updated the text. Could you check if I got it right?
It looks like that MY_RFM69_CS_PIN is used only in develop branch.
Stable brach still using MY_RF69_SPI_CS. -
@RAD-X both will work in the stable branch. See https://github.com/mysensors/MySensors/blob/28c4f3f19e7026f56fd9bbc61d566f770fd7a9d2/MyConfig.h#L935
@mfalkvidd
Hmm.... Is not that a reference to the development branch? :-)
I think that right content for stable branch is: https://github.com/mysensors/MySensors/blob/master/MyConfig.h
If you don´t believe it, try to download a stable branch, unpack and search for string "MY_RFM69_CS_PIN". -
@mfalkvidd
Hmm.... Is not that a reference to the development branch? :-)
I think that right content for stable branch is: https://github.com/mysensors/MySensors/blob/master/MyConfig.h
If you don´t believe it, try to download a stable branch, unpack and search for string "MY_RFM69_CS_PIN".@RAD-X yes, you are correct. Thanks for noticing.
I thought that if I selected the master branch on github and used the search function, the search results would only show hits from the selected branch. But it seems like this is not the case.
Linking to a specific line in a file doesn't work very well, because that line might move by later commits. That's why I select a specific commit to link to. But as you point out, my link points to a commit in the development branch.
The correct link is https://github.com/mysensors/MySensors/blob/8bb3cfb2e14214ae19e8531c989d1e81c9660614/MyConfig.h#L663 and there is indeed no support for MY_RFM69_CS_PIN.
I'll update the documentation again. The documentation is meant to reflect the current stable branch.
EDIT: Found this in the Github documentation:
Only the default branch is considered.
So there is no way to search in the stable branch.
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I have one question regarding the length of the 868MHz antenna. According to the theory, a the wavelength of a 868Mhz signal is 300/868 = 34.6 mm, so a quarter wave antenna should be 8.6mm long. The table above indicates 8.2mm. May someone confirm the correct figure, and also indicate how critical is that difference in terms of range?
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I have one question regarding the length of the 868MHz antenna. According to the theory, a the wavelength of a 868Mhz signal is 300/868 = 34.6 mm, so a quarter wave antenna should be 8.6mm long. The table above indicates 8.2mm. May someone confirm the correct figure, and also indicate how critical is that difference in terms of range?
@manutremo the speed of electromagnetic waves is slower in metal than in vacuum, that's why the length is shorter.
My experience is that the length doesn't need to be exact, but antenna theory is way too complicated for me to understand the details.
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@manutremo the speed of electromagnetic waves is slower in metal than in vacuum, that's why the length is shorter.
My experience is that the length doesn't need to be exact, but antenna theory is way too complicated for me to understand the details.
Many thanks @mfalkvidd . That explains it.
While waiting for an answer I also found some sites which mention that the speed of electromagnetic waves is even slower if the conductor has an isolation layer around, which would further justify the difference.
Many thanks! :+1:
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Many thanks @mfalkvidd . That explains it.
While waiting for an answer I also found some sites which mention that the speed of electromagnetic waves is even slower if the conductor has an isolation layer around, which would further justify the difference.
Many thanks! :+1:
@manutremo I think that part is due to skin effect.
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@manutremo I think that part is due to skin effect.
@mfalkvidd Many thanks again... I learn new things every day.
