Headless Setup of Raspberry Pi Zero W (Raspberry Pi 3 Wireless) Using OS X

How to install Raspbian on the Raspberry Pi without a monitor or keyboard.

For this to work, you will need a Raspberry Pi with a network module built in, or you will need to use a USB WiFi dongle.

  1. Formatt the Micro SD card - Open a terminal and type 'diskutil list'. Find your card and copy the disk name (For example: /dev/disk4). Format the card with diskutil eraseDisk ExFat temp disk4(Use your disk here)
  2. Download Raspbian - wget https://downloads.raspberrypi.org/raspbian_lite_latest
  3. Unmount the SD card - diskutil unmountDisk /dev/disk4 or whatever your disk path is
  4. Mount the Raspbian image to the card - sudo dd if=PATH-TO-RASPBIAN-IMAGE of=/dev/disk4` or whatever your disk path is
  5. Enable SSH on the Pi - cd /volumes && ls. You should see a boot partition from the SD card cd boot && touch ssh
  6. Setup WiFi on the PI - While still in the boot partition of the card type nano wpa_supplicant.conf and enter network={ ssid="YOUR-SSID" psk="YOUR-WIFI-PASSWORD" }
  7. Boot the PI - Unmount the card diskutil unmountDisk /dev/disk4 (or whatever your disk path is) and put it in the Pi, then power up the Pi
  8. SSH Into the Pi - Find the Pi's IP on your network by running arp -a or using an app like LanScan and ssh into it ssh pi@YOUR_PIS-IP. THe default password is raspberry
  9. Add your SSH key to the PI - While in the Pi run install -d -m 700 ~/.ssh. On you machine run cat ~/.ssh/id_rsa.pub | ssh @ 'cat >> .ssh/authorized_keys'

If you are installing Stretch, then you need the full wpa_supplicant

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev