Please help me convert my intercom into a smart one using ESP. This is my first project on ESP. Tell me which module is better for this purpose, what and where I need to connect… Below, I will provide you with photos of the handset and the schematic diagram.
What are you actually trying to automate?
I want to receive notifications when someone rings the intercom and be able to open the door.
Opening the door, put a relay over the pins for open door and fire it from the esp.
Detecting speech, not sure.
I guess the reed switch is for detecting whether the handset is mounted? I assume there’s a handset?
Yes. This electronic circuit is inside the handset. A magnet is installed in the platform on which the handset is suspended.
And then does the person also need to press the button after they have picked up the handset to initiate communication?
for notification, measure the voltage spike when the intercom door button is pressed (when you hear the ring), step it down to 5 volts using a DC step down module, then you can have it in esphome, you can use the following code:
- platform: gpio
pin:
number: D2
mode:
input: true
pullup: true
name: "Building Doorbell"
filters:
# Small filter, to debounce the button press.
- delayed_on: 100ms
- delayed_off: 100ms
The connection opens automatically after lifting the handset. The button must be pressed to open the door
I suspect I need two relays. One for closing the reed switch, which simulates picking up the handset, and the other for the door opening button. I found such a ready-made module with two relays:
Are there any external ADC modules that can be connected to ESP-01? When an incoming call occurs, there is a voltage appearing on the line. I need to somehow capture this moment…
What voltage appears? Could be as simple as a transistor to a regular gpio?
I finally had the chance to work on my project to integrate an old intercom into Home Assistant. This is my first ESP project, and I’m excited to share the results.
I’m pleased to report that the final result has been highly satisfying. The system works flawlessly and responds 100% of the time, meeting all my expectations.
Thanks for all the help and support in this topic.
INA226 to ESP32:
INA226 Internal Connections:
Relay Board Wiring:
ESP32 Configuration:
esphome:
name: intercom-calltracker
friendly_name: Intercom CallTracker
esp32:
board: esp32dev
framework:
type: arduino
logger:
api:
encryption:
key: "***"
ota:
- platform: esphome
password: "***"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
ap:
ssid: "Intercom-Calltracker"
password: "***"
web_server:
captive_portal:
i2c:
sda: GPIO21
scl: GPIO22
scan: true
id: bus_a
sensor:
- platform: wifi_signal
name: "WiFi signal strength"
id: wifi_signal_strength
update_interval: 60s
entity_category: "diagnostic"
device_class: signal_strength
- platform: internal_temperature
name: "Internal Temperature"
- platform: ina226
address: 0x40
shunt_resistance: 0.01 ohm
max_current: 3.2A
adc_time: 140us
adc_averaging: 128
update_interval: 3s
bus_voltage:
name: "INA226 Bus Voltage"
id: ina226_bus_voltage
binary_sensor:
- platform: status
name: "Status"
- platform: template
name: "IncomingCall"
device_class: sound
lambda: |-
if (id(ina226_bus_voltage).state > 1) {
return true;
} else {
return false;
}
button:
- platform: restart
name: "Restart"
ESP-01 Configuration:
esphome:
name: intercom-controlunit
friendly_name: Intercom ControlUnit
esp8266:
board: esp01_1m
logger:
api:
encryption:
key: "***"
ota:
- platform: esphome
password: "***"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
ap:
ssid: "Intercom-Controlunit"
password: "***"
web_server:
captive_portal:
binary_sensor:
- platform: status
name: "Status"
sensor:
- platform: wifi_signal
name: "WiFi signal strength"
id: wifi_signal_strength
update_interval: 15s
entity_category: "diagnostic"
device_class: signal_strength
button:
- platform: restart
name: "Restart"
switch:
- platform: gpio
id: handset_pickup
name: 'Handset pick up'
pin:
number: GPIO0
inverted: true
- platform: gpio
id: button_press
name: 'Button press'
pin:
number: GPIO2
inverted: true
on_turn_on:
- delay: 500ms
- switch.turn_off: button_press
Automation Code:
alias: Notify_Action
description: >-
Sends a notification when an incoming intercom call is detected. If the
input_boolean.intercom_open_once is enabled, the door opens automatically and
a confirmation notification is sent. Otherwise, the user receives a
notification with options to either open or dismiss the call.
trigger:
- platform: state
entity_id:
- binary_sensor.incomingcall
to: "on"
action:
- choose:
- conditions:
- condition: state
entity_id: input_boolean.intercom_open_once
state: "on"
sequence:
- action: script.control_intercom
data:
do_action: open
- action: input_boolean.turn_off
data: {}
target:
entity_id: input_boolean.intercom_open_once
- domain: mobile_app
type: notify
device_id: your_device_id
title: |
<b>Intercom</b>
message: |
<b><span style="color: #F07857">Automatically Opened</span></b>
data:
tag: Intercom_IncomingCall
sticky: "true"
color: "#87CEEB"
channel: IntercomNotification
ledColor: blue
notification_icon: mdi:deskphone
default:
- variables:
action_open: "{{ 'OPEN_' ~ context.id }}"
action_dismiss: "{{ 'DISMISS_' ~ context.id }}"
- domain: mobile_app
type: notify
device_id: your_device_id
title: |
<b>Intercom</b>
message: |
<b><span style="color: #006400">Incoming Call</span></b>
data:
tag: Intercom_IncomingCall
sticky: "true"
color: "#87CEEB"
channel: IntercomCall
ledColor: blue
notification_icon: mdi:deskphone
actions:
- action: "{{ action_open }}"
title: Open
- action: "{{ action_dismiss }}"
title: Dismiss
- wait_for_trigger:
- platform: event
event_type: mobile_app_notification_action
event_data:
action: "{{ action_open }}"
- platform: event
event_type: mobile_app_notification_action
event_data:
action: "{{ action_dismiss }}"
- platform: state
entity_id:
- binary_sensor.incomingcall
to: "off"
from: "on"
for:
seconds: 1
timeout:
minutes: 1
seconds: 5
continue_on_timeout: true
- choose:
- conditions:
- condition: state
entity_id: binary_sensor.incomingcall
state: "off"
for:
seconds: 1
sequence:
- domain: mobile_app
type: notify
device_id: your_device_id
title: |
<b>Intercom</b>
message: "<b><span style=\"color: red\">Call Interrupted</span></b>"
data:
tag: Intercom_IncomingCall
sticky: "true"
color: "#87CEEB"
channel: IntercomNotification
ledColor: blue
notification_icon: mdi:deskphone
- stop: Call Interrupted
- conditions:
- condition: template
value_template: "{{ wait.trigger.event.data.action == action_dismiss }}"
sequence:
- action: script.control_intercom
data:
do_action: dismiss
- conditions:
- condition: template
value_template: "{{ wait.trigger.event.data.action == action_open }}"
sequence:
- action: script.control_intercom
data:
do_action: open
- domain: mobile_app
type: notify
device_id: your_device_id
message: clear_notification
data:
tag: Intercom_IncomingCall
mode: single
Script Code:
alias: Control_Intercom
sequence:
- choose:
- conditions:
- condition: template
value_template: "{{ do_action == \"open\" }}"
sequence:
- action: switch.turn_on
metadata: {}
data: {}
target:
entity_id: switch.intercom_controlunit_handset_pick_up
- delay:
hours: 0
minutes: 0
seconds: 2
milliseconds: 0
- action: switch.turn_on
metadata: {}
data: {}
target:
entity_id: switch.intercom_controlunit_button_press
- delay:
hours: 0
minutes: 0
seconds: 2
milliseconds: 0
- action: switch.turn_off
metadata: {}
data: {}
target:
entity_id: switch.intercom_controlunit_handset_pick_up
- conditions:
- condition: template
value_template: "{{ do_action == \"dismiss\" }}"
sequence:
- action: switch.turn_on
metadata: {}
data: {}
target:
entity_id: switch.intercom_controlunit_handset_pick_up
- delay:
hours: 0
minutes: 0
seconds: 0
milliseconds: 500
- action: switch.turn_off
metadata: {}
data: {}
target:
entity_id: switch.intercom_controlunit_handset_pick_up
description: ""
Hello, @Oligarch. Thank you for sharing your experience. Can you tell how your project was powered? As I understood the intercom handset isn’t powered all the time so you can’t get power from there. Have you used batteries or is there some other useful advice?
In my case I couldn’t draw power from the intercom itself since it didn’t provide enough current. Instead, I had a 220V cable coming out of the wall from an old doorbell installation near the front door. I disassembled a regular 2A phone charger, soldered a USB cable to the charger board and the 220V leads, and placed everything inside a small enclosure from AliExpress.
