Wastebin Notifier

18 Jan 2021 - 4 minute read

Waste collection

We have multiple containers for different types of waste.
Green = compost Orange = plastic Blue = paper Gray = all other
One has to be places at the curb in some ingenious schedule. The collection company publishes an API with the collection schedule per address. Why not put it to use?

The idea

Why not build a small notifier that signals what bin will be collected?
Why not have that notifier be the shape of a bin with a lid that will light up in the color of the bin? And have a way so signal that the bin has been placed at the curb? My house uses HomeAssistant with ESPhome devices, so let’s build from there.

The build

3d design

The model is based on a model of Jigsawnz. I made a new model that will be able to fit some electronics to it. The model can be found on Thingiverse. It consists of three parts.

Body

The body is black and has the necessary holes and nubs to fit the USB cable, microswitch and lid-hinge.

Lid

The hinge is translucent and will fit to the nubs on the body, forming a hinge.

Electronics

The electronics part will house the electronics inside and has LED’s glued on top. It is modular so all electronics can be taken out as one part.

Electronics

The notifier has a Wemos D1 Mini inside with five WS2812 RGB LED’s and a microswitch. The microswitch is hot-glued in the body and is activated when touching the lid. The datapin of the LED’s is connected to GPIO4 (D2), the switch is connected between GPIO0 and GPIO2. GPIO2 provides the signal that will be picked up by GPIO0. By setting GPIO2 to “0”, I can disable the switch.

Firmware

It runs ESPhome and is connected to Home Assistant via MQTT.

The definition of the LEDs:

light:
  - platform: fastled_clockless
    chipset: WS2812
    rgb_order: GRB
    pin: GPIO4
    num_leds: 5
    name: wastebin_lid

The definition of the switch:

binary_sensor:
  - platform: gpio
    pin: 
    number: GPIO0
    inverted: true
    name: wastebin_lidswitch
    filters:
      # debounce delay
      - delayed_off: 10ms

The definiton of the enable/disable of the switch:

switch:
  - platform: gpio
    pin: GPIO2
    name: wastebin_lidswitch_disable
    restore_mode: ALWAYS_OFF

The complete firmware can be downloaded here.

Integration

An automation in Home Assistant checks daily the status of the API of our waste collector using pyppin’s AfvalBeheer plugin (https://github.com/pippyn/Home-Assistant-Sensor-Afvalbeheer). Depending on the returned value, an MQTT command is sent to the notifier to set the LEDs to a specific color.

Some details of the action in the Home Assistant automation:

alias: Wastebin notifier
description: ''
trigger:
- at: '18:00'
  platform: time

action:
- choose:
  - conditions:
    - condition: state
      entity_id: sensor.circulus_berkel_morgen
      state: gft
    sequence:
    - data:
        payload: '{"state":"ON","brightness":191,"color":{"r":0,"g":255,"b":0}}'
        topic: waste/notifier/light/lid/command
        service: mqtt.publish
    - conditions:
    - condition: state
        entity_id: sensor.circulus_berkel_morgen
        state: pmd
    sequence:
    - data:
        payload: '{"state":"ON","brightness":255,"color":{"r":255,"g":127,"b":0}}'
        topic: waste/notifier/light/lid/command
        service: mqtt.publish
    - conditions:
    - condition: state
        entity_id: sensor.circulus_berkel_morgen
        state: papier
    sequence:
    - data:
        payload: '{"state":"ON","brightness":191,"color":{"r":0,"g":0,"b":255}}'
        topic: waste/notifier/light/lid/command
        service: mqtt.publish
    - conditions:
    - condition: state
        entity_id: sensor.circulus_berkel_morgen
        state: restafval
    sequence:
    - data:
        payload: '{"state":"ON","brightness":191,"color":{"r":255,"g":255,"b":255}}'
        topic: waste/notifier/light/lid/command
        service: mqtt.publish
    default:
    - data:
        payload: '{"state":"OFF","brightness":191,"color":{"r":255,"g":255,"b":255}}'
        topic: waste/notifier/light/lid/command
    service: mqtt.publish
mode: single

When the lid is pressed and the microswitch is triggered, it is sent as a notification on an MQTT topic to Home Assistant and the LED’s are turned off. This is an indication that the bin has been places at the curb.

alias: Wastebin notifier - lid pressed
description: ''
trigger:
- platform: state
  entity_id: binary_sensor.wastebin_notifier_lidswitch
  from: 'off'
  to: 'on'
condition: []
action:
- service: mqtt.publish
  data:
    payload: '{"state":"OFF","brightness":191,"color":{"r":255,"g":255,"b":255}}'
    topic: waste/notifier/light/lid/command
mode: single

I hope this inspires you to create awesome things!

Future plans

I am planning to equip the bins with a tilt switch and have that signal sent over LoRaWAN back to HomeAssistant. When the bin is flipped upside-down (eg. when the bin is emptied), this status is sent back and can be used to blink the lid of the notifier as an indication that the empty bin can be retrieved from the curb.