HomeAssistant Doorbell Button Sensor

Parts used in this project:

• ESP 8266 Module
• Inductive Current Pickup
• 5 x 1N4148 Diode or similar
• 1 x 1N4007 Diode or similar
• 1 x 4.7µF 15v Capacitor (value not super specific)
• 2 x 27µF 50v Capacitor (value not super specific). Multiple holes provided for a variaty of lead spacing.
• 1 x 0.1µF 15v Capacitor
• 1 x 3.3v Zener Diode
• 1 x 10kΩ Resistor (may need to be varied based on your specific doorbell transformer)
• 1 x 82 Ω 1/2 watt resistor (used to drop the voltage for the 7805 regulator. Adjust as needed.)
• 1 x 7805 Voltage Regulator

• Optional

• 1 x Generic LED (for power)
• 1 x 330Ω Resistor (used as LED current limit. Adjust as desired).

Temative Board image

Board is 95mm x 95mm.

ESPHome Configuration:

esphome:
  name: doorbell-button
  friendly_name: Doorbell_Button

esp8266:
  board: nodemcu

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "itsasecret"

ota:
  password: "itsasecret"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Doorbell-Button Fallback Hotspot"
    password: "itsasecret"

captive_portal:


switch: # controls the LED on the nodemcu8266
  - platform: gpio
    name: "$devicename LED"
    id: ledlight
    pin:
      number: D4 # GPIO2 Blue LED pin
      inverted: yes

binary_sensor:
  - platform: gpio
    pin: D1
    name: "Door Bell Button"
    device_class: door
    on_press:
        - switch.turn_on: ledlight
    on_release:
        - switch.turn_off: ledlight