ANT+ or BLE for a P2P application

RE: ANT+ or BLE for a P2P application

sslap — Fri, 27 Feb 2015 08:47:12 GMT

One last small thing: You're saying that the development dongle can handle 128kbps but with which softdevice is this than? Because as said the S120 cannot handle this data throughput and S110 isn't really made as a continuous reciever or am I wrong?

Thanks a lot!!

RE: ANT+ or BLE for a P2P application

sslap — Tue, 24 Feb 2015 14:36:33 GMT

the battery isn't fixed yet but it would be a 3V or if needed 3.7V. I think the size of battery will more be specified by the needed power (it will be a rechareble battery that is certain)

RE: ANT+ or BLE for a P2P application

Petter Myhre — Tue, 24 Feb 2015 12:41:44 GMT

So your device needs to send 11 bytes every 1 ms? Which means a data rate of 11*8/0.001 kbps = 88kbps. And you need a lifetime of at least 24 hours. What kind of battery are you planning to use?

RE: ANT+ or BLE for a P2P application

Petter Myhre — Tue, 24 Feb 2015 10:19:25 GMT

The ANT protocol is simpler. It is up to the application to implement more advanced features.

The BLE protocol is more complex, more robust, and more secure. It includes more advanced features.

Your question only includes information about the required data rate, which makes it very challenging to have an opinion on what protocol that is best for your application.

Edit 24.02: So you need a data rate of 88kbps, and you want to use as little power as possible.

If 88kbps is an absolute requirement, ANT can't be used, it has a maximum data rate of 60kbps, using Advanced Burst Data, please see Section 5.4.4 in "ANT Message Protocol and Usage".

With BLE, 128kbps is possible, please see this, but it depends on the devices.

Our peripheral stack(S110) can send 6 packets of 20B in each connection interval, and have a connection interval of 7.5ms.

However, our central stack(S120) can only recieve 1 packet of 20B in each connection interval, and have connection interval of 7.5ms.

This gives a data rate of 20*8/0.0075 kbps = 21.3 kbps. Not good enough.

Our development dongle can handle 6 packets of 20B in each connection interval, and have a connection interval of 7.5ms.

This gives a data rate of 20 * 8 * 6/0.0075 kbps = 128 kbps. Good enough, but our development dongle is not a standalone Bluetooth device, so you need driver on the PC to control it.

RE: ANT+ or BLE for a P2P application

sslap — Mon, 23 Feb 2015 13:06:09 GMT

For the moment it is a Nrf51422 as sender and the Nrf51822 dongle as reciever (PCA10001). In a further design it will be two senders and one reciever

RE: ANT+ or BLE for a P2P application

Petter Myhre — Mon, 23 Feb 2015 12:22:47 GMT

Are you using an nRF51 on both sides of the link? Or something else?