Cheapest nrf51822 peripheral available ?

[Mohib]

Hi, CAn anyone plz help me getting the cheapest possible nrf51822 small module that i can use in my project as peripheral ?

Or any other module that can work as slave with nrf51822 ek that is central ?

Any help will be appreciable .

[Mahesh Venkitachalam]

You can find several nrf51822 modules for under 6 USD on Aliexpress. For example:

www.aliexpress.com/.../32281199327.html

But if you are buying in volume (1000 pcs) you can find better modules for around 3.5 USD.

The central/peripheral roles can be switched by just changing the softdevice, as far as I understand.

Update #1:

Based on RK's comment below, here is a link to Nordic docs on chip versions:

www.nordicsemi.com/.../39119

[RK]

Look closely at that picture and I believe the build code is QFAAC0, would you agree? That's a revision 1 chip if it is. You really want rev 3 chips and at the very least rev 2.

So don't go too cheap - you don't know what you're getting.