nRF51822 to nRF51822 proximity buzzer help

[arsalanjun]

Hi,

I am new to nRF5x BLE devices.

I need to create a project and would like you to help me out.

I need to connect two nRF51822 devices. If one of the devices goes away from the proximity (5m) one of it beeps with a buzzer. (No app control required)

Just like a car key fob. If you take the key 5m away from the car it should beep.

How can I do this?

1. Can I use arduino IDE for this?

2. what is the easiest way to program it?

3. How do I code it?

   1. One will advertise/transmit data/location.
   2. The other module will keep on checking the distance and if the distance exceeds 5m (signal strength, db etc) it should beep.

I clearly have no idea, please help.

[Øyvind Karlsen]

Hi,

This is possible, the simplest way to implement this would be using the received signal strength indication (RSSI) and calibrating this for the real life usage scenario. This is similar to what you suggest in 3.2.

I do not recommend using the arudino IDE for this, instead have a look at our getting started tutorials using the Keil IDE.

Best regards,

Øyvind

[arsalanjun]

Thanks for the help Øyvind. I just received my BK and DK. Will start developing soon. I have another question, What is the best way to connect these two devices and performing this task(Bonding, beacon advertisement etc)?

[Øyvind Karlsen]

The simple uart over BLE service described in this tutorial is a good starting point.

[arsalanjun]

Thanks I will have a look at it. Cheers