How can I build Wireless sensor network using nRF51422

[Alok]

I have about 200-300 sensors, each requiring to send data at around 0.5-1Kbps to a central node (coordinator/master node), what will be the network configuration/topology using nRF51422 (or any other better suited Nordic IC) to send the data of all the sensors to the central node?

[ovrebekk]

Hi

If you want to support this many sensors sending that much data you need to implement some kind of timeslot mechanism, where each sensor gets a unique time in which to send data to the central node.

One way to do this is to have the central node send a beacon packet to all the sensors at a regular interval. Each sensor will have to be configured with a unique ID, and based on this ID each sensor can calculate a unique timeslot some time after the beacon packet was received. The central node will then switch to receive mode to pick up all the packets from the various sensors.

The beacon packet from the central node will have to be broadcast to all the sensors (ACK's disabled), while the packets sent from the sensors to the central could have ACK's enabled.

You probably want to use the micro ESB library as a basis, since it introduces less overhead than the standard ESB library available in the SDK:
https://github.com/NordicSemiconductor/nrf51-micro-esb

Bets regards
Torbjørn

[Alok]

Thanks, what kind of typologies (star/tree/mesh) can be supported using proprietary radio, and what is the max number of nodes that the network will be able to support. How can central node send beacons on multiple preconfigured nodes (I assume the beacon is not sent simultaneously on multiple channels, rather it is sent serially, other wise multiple radios are required ?) and if the sensor can respond with data on either of these channels, the central node should be configured to receive the data on all the channels, which will again mean that central node needs to have multiple radios, listen simultaneously, or I may be missing something.