Vibration Sensor for ESPHome/Home Assistant

vibration_sensor_ESP32_HA_how_to.txt

GOAL: Send a push notification after the (vibrations from the) dryer cycle has completely stopped.

USING:
  * Inexpensive hardware (see below)
  * ESPhome (http://esphome.io) for chip firmware
  * Home Assistant (http://hass.io) for sensor state machine and push notification.

---
SHOPPING LIST:

ESP32 DEV BOARD:
https://www.amazon.com/gp/product/B079PVCF2G/

SW-420 VIBRATION SENSOR:
https://www.amazon.com/gp/product/B06XHFFPL6/

MICRO USB POWER SUPPLY:
https://www.amazon.com/gp/product/B00MARDJZ4/

3 FEMALE-TO-FEMALE JUMPER WIRES:
https://www.amazon.com/gp/product/B07GD2BWPY/

MOUNTING TAPE:
https://www.amazon.com/Scotch-Mounting-5-Inch-75-Inch-2-PACK/dp/B00SJ6HA7S/

CASE:
https://www.amazon.com/gp/product/B07G8S6XLV/

---
SETUP:

1) Create new text file, espvibration1.yaml

2) Place in file the following YAML, customizing the "ssid" and "password" values:

# Names and defines the hardware
esphome:
  name: espvibration1
  platform: ESP32
  board: nodemcu-32s

# Defines WiFi network/password
wifi:
  ssid: "YOUR WIFI NETWORK"
  password: "YOUR WIFI PASSWORD"

# Enables logging via console
logger:

# Enables Home Assistant API, pushes sensor state back to Home Assistant
api:

# Enables over-the-air firmware updates
ota:

# Sensors that the ESPhome unit is capable of reporting
sensor:
  - platform: wifi_signal
    name: "ESPVibration1 WiFi Signal"
    update_interval: 60s
  - platform: uptime
    name: "ESPVibration1 Uptime"
    update_interval: 60s

# Enables status LED
status_led:
  pin: GPIO2

# Enables the SW-420 Vibration Sensor
binary_sensor:  
  - platform: gpio  
    name: "Dryer"  
    pin:
      number: GPIO13
      mode: INPUT
    device_class: vibration
    filters:
     - delayed_on: 10ms
     - delayed_off: 5min

3) Upload espvibration1.yaml to ESP32 dev board ("esphome espvibration1.yaml run").

4) Connect the vibration sensor to the ESP32 dev board using jumper wires:
  a) Connect "VCC" on the SW-420 to the pin labeled "3V3" on the ESP32.
  b) Connect "GND" (ground, center pin) on the SW-420 to the pin labeled "GND" on the ESP32.
  c) Connect "D" on the SW-420 to pin "D13" on the ESP32.
  NOTE: Feel free, if you are confident, to solder those jumpers in when successfully tested.

5) Drill small hole in case for power supply.

6) Place vibration sensor in case with mounting tape.

7) Place ESP32 board into case.

8) Stick case to object to be monitored with mounting tape.

9) Power up the ESP32.

10) In the Home Assistant web UI, go to "Configurations > Integrations". Activate the newly discovered "espvibration1".

11) In automations.yaml, add the following code:

- id: 'espvibration1'
  alias: Dryer Done
  trigger:
  - entity_id: binary_sensor.dryer
    from: 'on'
    platform: state
    to: 'off'
  condition: []
  action:
  - data:
      message: The dryer is done.
    service: notify.ios_iphone
    
NOTE: Substitute the Home Assistant service ("notify.ios_iphone") that applies to your favored notification.

12) Reload your automations. You should now get a push notification 15 seconds after the dryer is finished. 

13) Adjust the "delayed_off" value in the ESPHome code to account for your dryer's particular cycle, to avoid false positives.

Hi @jeffehobbs , thanks for putting this together. I'm new to ESPHome so this is a great start for me. I'm having some trouble with false positives when I close the dryer door. How are you handling this case? I've tried adjusting the sensitivity on the SW-420 but it doesn't seem to help, I've also tried setting an input_boolean but can't get the timing right. What are you doing to prevent the notification when only closing the door?

Hey @nickelnine, I've updated the gist to show what I eventually landed on to avoid false positives; I set a "delayed_on" of 10ms and a "delayed_off" of 5min (my dryer has a lot of different modes and stops and starts between).

I'd adjust those two settings in the ESPHome code to taste, to best match what your particular dryer does during a normal cycle.

Hi @jeffehobbs Do you have the exact models you used here? like which esp32 board model. Since some of the links do not work anymore.

Thanks!