amclain / m2x-nerves-test

A test of sending data to M2X using a BeagleBone Black running Elixir and Nerves.

M2X Nerves Test

A test of sending data to M2X using a BeagleBone Black running Elixir and Nerves.

Prerequisites

• BeagleBone Black
• Nerves
• Elixir
• M2X Account (free)
• Micro SD card
• Components: Switch, LED, 1k resistor, jumper wires, breadboard

Pinouts

DGND     (P9-2)
VDD_3.3V (P9-4)
GPIO_26  (P8-14): Switch
GPIO_44  (P8-12): LED (w/ 1k current limiting resistor)

Configuration

• Copy config/dev.sample.exs to config/dev.exs.
• Create an M2X device using the M2X UI.
• In the M2X UI, create a numeric stream named switch_1.
• Copy the M2X device ID and API key to config/dev.exs.

Compiling

Set the target hardware to the BeagleBone Black. This only needs to be done once for a given shell session.

export MIX_TARGET=bbb

Fetch the project dependencies:

mix deps.get

Compile the firmware:

mix firmware

Burn the firmware to an SD card:

mix firmware.burn

Insert the card into the BeagleBone Black, power up the board, and monitor the console. If it boots to the onboard flash instead of the SD card, hold down the user button (S2) while rebooting.

Running

Closing the switch (GPIO_26) will send a value of 1 to M2X. Opening the switch will send a value of 0. This will be shown on the M2X stream graph/log.

Run bin/set_led to send an M2X command to turn the LED on(1)/off(0). The API key must be an account master API key.

API_KEY=ABCDE DEVICE_ID=12345 set_led 1