What is the best frequency to send data from nrf51822 DK to an Android Device using BLE?

[Victor]

Hi everyone,

My name is Victor and I am doing an internship in New-Zealand. My work is to send data from 8 MS5803-02BA pressure sensors to an Android device.I am using a Nordic nrf51822 DK and I am programming on Keil v5. I am also new in Android, BLE and Nordic worlds.

So here is my problem: the pressure value for one sensor is provided into a 24-bits digital value (3 bytes). For 8 sensors, it is going to be 3bytes*8sensors = 24 bytes. Actually, my sampling frequency is around 6Hz in order to have a good resolution. So, every 167ms, I would like to send a 26 bytes packet of data ( 24 bytes from the sensors + 2 bytes as packets' numbering). Is it possible?

I read that the amount of data was restricted to 20 bytes per packets. If you can help me, it would be great.

Regards, Victor

[Wojtek]

I am not sure this is best solution, but here is what I did: I had similar problem - I had to send 2-byte readings from 16 sensors.

I just made one characteristic with sensors 1-8 and second characteristic with sensors 9-16, so I had to send two 16-bytes notification packets after sensor reading cycle - one notification on each characteristic.

[Victor]

Thanks for your answer! I will try that.