This project demonstrates how to connect to a Raspberry Pi via Wifi and use a General Purpose Input/Output (GPIO) pin to turn an LED on and off.

** This has only been tested with a Raspberry Pi 3 Model B

Set the following environment variables first:

• MIX_TARGET (Example: "rpi3")
• NERVES_NETWORK_KEY_MGMT (Example: "WPA2-PSK")
• NERVES_NETWORK_SSID (Your network SSID)
• NERVES_NETWORK_PSK (Your network PSK)

Un-comment and set the node name line in rel/vm.args:

• -name networked_light@(Raspberry Pi IP address)

To start your Nerves app:

• Install dependencies with mix deps.get
• Create firmware with mix firmware
• Burn to an SD card with mix firmware.burn

Send firmware to Raspberry Pi via wifi:

• mix firmware.push (Raspberry Pi IP address) --target rpi3

You will need a single LED connected to GND and a GPIO pin with a 270 Ω resistor.

The default configuration uses GPIO pin 26, which can be found on a Raspberry Pi using the following diagram from https://pinout.xyz:

You can connect to the Raspberry Pi node with the following command:

• iex --name "me@mynode" --cookie jeeplife --remsh "networked_light@(Your Raspberry Pi IP Address)"

• NetworkedLights.Server.led_on

• NetworkedLights.Server.led_off

• nerves_firmware_http
• nerves_network
• elixir_ale
• logger_multicast_backend
• poison

• Official docs: https://hexdocs.pm/nerves/getting-started.html
• Official website: http://www.nerves-project.org/
• Discussion Slack elixir-lang #nerves (Invite)
• Source: https://github.com/nerves-project/nerves