This is an Elixir Nerves project running on a Raspberry Pi. It is from the book Build a Weather Station with Elixir and Nerves: Visualize Your Sensor Data with Phoenix and Grafana, by Alexander Koutmos, Bruce A. Tate, and Frank Hunleth.
The Pi collects data via sensors and POSTs it to a Phoenix server. Data is visualized with Grafana.
# docker
cd weather_tracker
docker-compose up # visit localhost:3000 admin/admin
# phoenix (separate terminal)
cd weather_tracker
mix phx.server # API on localhost:4000
# to inspect/debug the device
ssh hub.local
RingLogger.attach()
exit()The devices I have are slightly different from the ones used in the book:
| device | mine | book |
|---|---|---|
| ambient light sensor | VCNL4040 | VEML6030 |
| atmospheric sensor | BME280 | BME680 |
| air quality | CCS811 | SGP30 |
Getting values from sensors:
ssh hub.local
VCNL4040.start_link()
VCNL4040.get_measurement()
alias SensorHub.Sensor
gas = Sensor.new(Ccs811)
environment = Sensor.new(BMP280)
Sensor.measure(gas)
Sensor.measure(environment)Update the Pi:
export MIX_TARGET=rpi4
cd sensor_hub
mix deps.get
mix firmware
mix upload hub.local
mix burn # for when it's hard-wired, not sshCCS811 air quality / BME280 atmospheric sensor - https://www.sparkfun.com/products/14348
VEML6030 light sensor - https://www.sparkfun.com/products/15436