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ESP32 AM312 motion sensor automation

DIY 5 minutes : Connect esp32 to the motion sensor am312 and create an automation.

In the last article, we’ve seen how to turn on/off the smart light depending on the presence of your smartwatch. In this article, we will see how to turn on/off the light using the PIR motion sensor AM312.

Requirements

Before starting the tutorial, you should have these materials.

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Wiring the components

AM312 has 3 pins: 5v, GND and DATA. The DATA pin should be connected to a non-reserved pin on esp32. I’ve chosen GPIO13.

Wire the AM312 pir sensor to esp32 as following:

AM312ESP32
GNDGND
5V5V
DataGPIO13

AM312 Motion sensor pimns

ESPhome configuration

If you are not familiar with esphome [check this article](/how-to-monitor-your-home-temperature-with-esp32-and-xiaomi-mijia-using-esphome/.

Run ESPhome on your computer, and prepare the esp32 configuration:

  • Create a config file motionsensor.yaml under config directory.
  • Add the following configuration to the file.
substitutions:
  # Modify variables based on your settings
  hostname: "pirsensor"

esphome:
  name: $hostname
  platform: ESP32
  board: esp32dev
wifi:
  ssid: wifi_ssid
  password: wifi_password
  fast_connect: True

# Enable logging
logger:

# Enable Home Assistant API
api:
  reboot_timeout: 0s

web_server:
  port: 80

ota:

# Example configuration entry
binary_sensor:
  - platform: gpio
    pin: 13
    name: "PIR Sensor"
    device_class: motion

Now you can flush your esp32 with the configuration above.

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Configuring smartbulb

If your smart bulb is not configured yet, you can refer to this video to see how to setup it.

Home assistant automation

Once your esp32 is configured, connected to the wifi and to home assistant, let’s create the automation.

Indeed, 2 automations are required :

  • When the PIR is ON, turn on the light
  • When the PIR is OFF, turn OFF the light after 1 minute

In the ${HOME_ASSISTANT_DIR}/config, add the following configuration to the automations.yaml:

- alias: Room Motion On
  trigger:
    - platform: state
      entity_id: binary_sensor.pir_sensor
      to: "on"
  condition:
    - service: light.turn_on
      # light.myroom is the home assistant ID of my smart bulb in home assistant
      entity_id: light.myroom

- alias: Room Motion Off
  trigger:
    - platform: state
      entity_id: binary_sensor.pir_sensor
      to: "off"
      for:
        minutes: 1
  action:
    - service: light.turn_off
      entity_id: light.myroom

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Author

Omar Ghader

Fullstack web engineer and devops. Mobile web specialist