💬 The Sensor Network
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This thread contains comments for the article "The Sensor Network" posted on MySensors.org.
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So if I understand correctly I could just by default enable the repeater on every non-battery powered node I create? The nodes wil only use a repeater if they can't connect to the gateway directly? Are there any downsides to enabling it, besides using more battery? Will the airwaves be full of repeating shouting nodes, like a speech at an Occupy demonstration, and perhaps disrupt wifi?
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So if I understand correctly I could just by default enable the repeater on every non-battery powered node I create? The nodes wil only use a repeater if they can't connect to the gateway directly? Are there any downsides to enabling it, besides using more battery? Will the airwaves be full of repeating shouting nodes, like a speech at an Occupy demonstration, and perhaps disrupt wifi?
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In the example sketch for the RepeaterNode it has this info:
- It is important that nodes that has enabled repeater mode calls
- process() frequently. Repeaters should never sleep.
So, is this for older sketches for versions below 2?
Do we need to add something more to the example sketch? -
If I have multiple repeater nodes, is there a way to force a child node to got to a repeater Node and not to the GW? I have tried to use the setDestination function but that still goes via GW.
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@talhatec setDestination sets final destination, not intermediate destination.
Use MY_PARENT_NODE_ID and MY_PARENT_NODE_IS_STATIC to set static routing.
@mfalkvidd I will try this out today and see if it helps. But this will just make the child node always communicate with the Repeater node. What im trying to do is : https://forum.mysensors.org/topic/6984/pairing-nodes-with-each-other
So on first boot, i want the child node to goto the GW and get a node-ID and register itself. Afterwards I want it to pair to a Repeater node.
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A theroetcical capacity using RFM 95 LoRa radios in 433 MHz ISM band:
Lora Config bandwith: 125 KHz.
ISM band 433.050 - 434.790 MHz.
Allows for these 5 "channels";- 433.125
- 433.400
- 433.650
- not used (ISM noise from commercial devices on 433.920 etc)
- 434.150
6 .434.400
7 .not used (local ham repeater), (yes its nice to check!)
Each GW can handle 254 RF Nodes
254 x 5 RF channels = 1270 sensor nodes in any one geographical location. (including repeated nodes)?
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A theroetcical capacity using RFM 95 LoRa radios in 433 MHz ISM band:
Lora Config bandwith: 125 KHz.
ISM band 433.050 - 434.790 MHz.
Allows for these 5 "channels";- 433.125
- 433.400
- 433.650
- not used (ISM noise from commercial devices on 433.920 etc)
- 434.150
6 .434.400
7 .not used (local ham repeater), (yes its nice to check!)
Each GW can handle 254 RF Nodes
254 x 5 RF channels = 1270 sensor nodes in any one geographical location. (including repeated nodes)?
p@cloolalang you can also vary the spreading factor (6 alternatives) and the coding rate (4 alternatives), yielding 24x1270= 30,480 nodes. There are other options as well (encryption, directed antennas and more) but what to do will vary in each use case. Theoretical calculations can be fun, but they do not represent the real world.
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@cloolalang you can also vary the spreading factor (6 alternatives) and the coding rate (4 alternatives), yielding 24x1270= 30,480 nodes. There are other options as well (encryption, directed antennas and more) but what to do will vary in each use case. Theoretical calculations can be fun, but they do not represent the real world.
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@mfalkvidd Hello, you can give an example of how to do this ? and if it is possible to perform on a Gateways ?
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@frydrik all nodes, including the gateway, on the same MySensors network need to use the same settings.
Documentation for settings: https://www.mysensors.org/apidocs/group__RFM95SettingGrpPub.html#gaedc32edc29ffd4ecc2c849e39010069e
@mfalkvidd Thanks for the answer, I want to create a network for reading electric meters in a city with a population of over 500,000 people, the limit of 254 nodes is too small, yes, I understand that you can create more Gateways to share them after different frequencies, the spreading factor, coding rate, and I understand according to this scheme that the point where there will be Gateways will consist of several Gateways each will have as ex. a different frequency and only the nodes will be connected to it with its frequency, you can look at the sketch drawn by me. It gets too complicated, can it be done in a single GW or with a reduced number of GW?
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@mfalkvidd Thanks for the answer, I want to create a network for reading electric meters in a city with a population of over 500,000 people, the limit of 254 nodes is too small, yes, I understand that you can create more Gateways to share them after different frequencies, the spreading factor, coding rate, and I understand according to this scheme that the point where there will be Gateways will consist of several Gateways each will have as ex. a different frequency and only the nodes will be connected to it with its frequency, you can look at the sketch drawn by me. It gets too complicated, can it be done in a single GW or with a reduced number of GW?
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These technologies are quite expensive to make, mysensors comes with some pretty cheap solutions, I think mysensors can be used in urban areas where the density of electric meters is quite high, especially in the panels where the meters are usually installed are grouped several as ex. 4 and more, for this panel you can mount a node that will read the indications of all meters, thus drastically reducing the number of nodes and the cost will be even more attractive to carry out this project, I thought that these nodes can be made on esp8266 + RFM95 to gain greater distances between Gateways nodes, in rural areas I will think about implementing LoraWan, for me it is quite complicated to clarify with this technology.
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These technologies are quite expensive to make, mysensors comes with some pretty cheap solutions, I think mysensors can be used in urban areas where the density of electric meters is quite high, especially in the panels where the meters are usually installed are grouped several as ex. 4 and more, for this panel you can mount a node that will read the indications of all meters, thus drastically reducing the number of nodes and the cost will be even more attractive to carry out this project, I thought that these nodes can be made on esp8266 + RFM95 to gain greater distances between Gateways nodes, in rural areas I will think about implementing LoraWan, for me it is quite complicated to clarify with this technology.
@frydrik LoRaWAN nodes can be made with esp8266 and rfm95. I have done so myself.
LoRaWAN gateways are slightly more expensive, but they are able to handle at least tens of thousands of nodes which is 100x more than a MySensors gateway, so the cost per node is much much lower than for MySensors.
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the problem is that I can't find code examples for LoraWan nodes so I can start this project on LoraWan, first I created my own LoraWan gateways on TTGO LoRa32 SX1276 OLED, and on another module TTGO LoRa32 SX1276 OLED a test node as in the video on youtube https://www.youtube.com/watch?v=T40a51TAMDI&t=401s
something works but the number of messages that reach the gate are very small in 24 hours I can receive 5-6, the problem I think I miss a gateways with one channel, and the node transmits randomly on that 8 channels, in addition I do not understand how to combine a sketch that reads the pulses from a meter with the loraWan library, I can't find examples of how to do it, that's why I was enchanted by the mysensors community, it's simple to create a node to understand how it works,
in mysensors I found what I needed + it is a receptive community, if you have experience with LoraWan please guide me how to start creating these nodes, I found how to build a local LoRaWAN® Network Server, and unfortunately here I stopped -
the problem is that I can't find code examples for LoraWan nodes so I can start this project on LoraWan, first I created my own LoraWan gateways on TTGO LoRa32 SX1276 OLED, and on another module TTGO LoRa32 SX1276 OLED a test node as in the video on youtube https://www.youtube.com/watch?v=T40a51TAMDI&t=401s
something works but the number of messages that reach the gate are very small in 24 hours I can receive 5-6, the problem I think I miss a gateways with one channel, and the node transmits randomly on that 8 channels, in addition I do not understand how to combine a sketch that reads the pulses from a meter with the loraWan library, I can't find examples of how to do it, that's why I was enchanted by the mysensors community, it's simple to create a node to understand how it works,
in mysensors I found what I needed + it is a receptive community, if you have experience with LoraWan please guide me how to start creating these nodes, I found how to build a local LoRaWAN® Network Server, and unfortunately here I stopped -
@frydrik I have multiple years of experience with LoRaWAN, but transferring that experience from one person to another in a forum thread is not possible.
