Step by Step instructions on installing Bitcoin Core 0.14 on Raspberry Pi Zero and 1/2/3?
This is a guide I used to install a full node on a Raspberry Pi 3B with 1GB of RAM.
You have to compile the code and therefore need a RAM swap on an external HDD. Make sure it is mounted correctly, or it will wear out the sd card!
https://medium.com/@meeDamian/bitcoin-full-node-on-rbp3-revised-88bb7c8ef1d1