Which version of SDK should I use on my nrf51822??

[Mitch996]

Hi, the latest version of SDK is 14.x.x, by principle I should be using the latest, except by going through the SDK14 folders I get the impression that it is exclusively for high end or nrf52 devices, on the other hand, the SDK itself IS called nrf5 sdk, which suggests that there is a slim chance it is for all nrf5 deviecs.

This is so confusing? I'm working on an nrf51822 board, custom designed. As far as I'm concerned, I should use the S110 softdevice, the problem is that starting with SDK11, there is no longer an S110 sd included.. which is where all the confusion came from.

Can anyone help me?

[endnode]

If you want to stick with nRF51 then last nRF5 SDK supporting it is v12.3.0. In addition S110 is more or less deprecated for few years, you should use S130 which is available there. For all compatibility concerns simply read compatibility matrix and stick with numbers presented there (so e.g. if you insist on S110 then you need to go to SDK v10.0.0).

[endnode]

No, S130 is "all in one" and the only one "supported". And no, if compatibility matrix says that the last nRF5 SDK with nRF51 support is v12.3.0 then nothing for nRF51 in V14.x.