Entropy Reduction

Personal log of yet another digital native.

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Project maintained by andre-abadi Hosted on GitHub Pages — Theme by mattgraham

Purpose

• Garage door automation and integration with Home Assistant

Reference

• The Frenck article that started it all
• Debugging the ESP8266 ESP-01S Relay Module
• ESP8266 GPIO Behaviour at Boot
• ESP-01 is a frustrating and finicky board.

Actions

• Fixed relay module using guide and a soldered 10K resistor between GPIO0 and 3.3V as shown in the aforementioned link
• Initially used a buck converter from garage door controller 30V but it blew due to overvoltage on garage door controller startup
• Swapped to USB power via input bus
• Added power LED for diagnostics
• Used minimal hot glue on relay board causing it to fall off
• Super-glued ESP-01S relay with liquid nails causing PCB damage
• Soldered another relay board using the aforementioned resistor hack
• Used more hot glue to fight gravity
• Mounted in an Altronics clear waterproof project box
• Drilled into ceiling near garage door controller

Pictures

Code

# reed switch sensor
binary_sensor:
  - platform: gpio
    id: gpio2
    name: "${friendly_name} Sensor"
    device_class: garage_door
    pin:
      number: GPIO2
      mode: INPUT_PULLUP
      inverted: true
    filters:
      - delayed_on: 1000ms
      - delayed_off: 1000ms

switch:
  # actual GPIO0 switch
  - platform: gpio
    id: gpio0
    restore_mode: ALWAYS_OFF
    pin:
      number: GPIO0
  # wrapper for GPIO0 making it a momentary switch
  - platform: template
    internal: true
    id: gpio0_momentary
    name: "${friendly_name} Button"
    icon: "mdi:light-switch"
    turn_on_action:
      - switch.turn_on: gpio0
      - delay: 250ms
      - switch.turn_off: gpio0
cover:
  - platform: template
    name: "${friendly_name}"
    id: garage_door_cover
    device_class: garage
    lambda: |-
      if (id(gpio2).state) {
        return COVER_OPEN;
      } else {
        return COVER_CLOSED;
      }
    open_action:
      - switch.turn_on: gpio0_momentary
    close_action:
      - switch.turn_on: gpio0_momentary

Observations

• Liquid nails does bad things to PCBs
• Project boxes don’t adhere well to hot glue
• Hot glue must cool completely before it gets all its binding effect
• ESP-01S has lots of fiddly boot moods
• Sometimes ESP-01S does not boot if on power restore\
• Soldering sans flux is a bad time