我想了解一下，NRF52840作为无线组网的时候相邻设备最大接入距离是多远？最大能接入多少个设备？
Hi,
I don't understand what those symbols mean, but google translate says it is Chinese and translates it to:
"I would like to know how far the maximum access distance of neighboring devices is when NRF52840 is used as a wireless network. How many devices can I access at most?"
Q1) maximum access distance:
This depends on your environment, network protocol, and device configuration. You will get better range in an open field (line of sight) than you will inside a building for example. Please refer to these two blogs:
Testing Long Range (Coded PHY) with Nordic solution
Exploring Bluetooth 5 - Going the Distance
Q2) How many devices can I access at most?
That also depends on your chosen network protocol. By using BLE Mesh, Thread, or Zigbee you can have thousands of devices in a single network. If you go for Bluetooth low energy then a single device can connect to 20 other devices.
Could you provide two NRF52840 demo boards for me to test?
Hi,
For sample requests please contact our regional sales manager for your area. If you don't know who that is please send me a PM and I'll give you his details.
I don't known who is my area sales manager. My address is Hangzhou, Zhejiang, China.
The end device of this series can also be used as a router, the router can also be used as an end device, and the router can also act as a co-ordinator?
Please refer to this documentation: Node Roles and Types.
Sorry,I can't open this page
Being a Router requires a lot of memory and current because it needs to keep track of other nodes in the network and has its radio on continuously. End Devices are typically memory and current constrained. Hence, dedicated End Devices cannot become routers. However, a Router can act as an End Device.
From the documentation in my link:
A Router is a node that:
An End Device (ED) is a node that:
Furthermore, nodes comprise a number of types.
A Full Thread Device (FTD) always has its radio on, subscribes to the all-routers multicast address, and maintains IPv6 address mappings. There are three types of FTDs:
An FTD can operate as a Router (Parent) or an End Device (Child).
A Minimal Thread Device does not subscribe to multicast traffic and forwards all messages to its Parent. There are two types of MTDs:
An MTD can only operate as an End Device (Child).
Being a Router requires a lot of memory and current because it needs to keep track of other nodes in the network and has its radio on continuously. End Devices are typically memory and current constrained. Hence, dedicated End Devices cannot become routers. However, a Router can act as an End Device.
From the documentation in my link:
A Router is a node that:
An End Device (ED) is a node that:
Furthermore, nodes comprise a number of types.
A Full Thread Device (FTD) always has its radio on, subscribes to the all-routers multicast address, and maintains IPv6 address mappings. There are three types of FTDs:
An FTD can operate as a Router (Parent) or an End Device (Child).
A Minimal Thread Device does not subscribe to multicast traffic and forwards all messages to its Parent. There are two types of MTDs:
An MTD can only operate as an End Device (Child).