Hi,
I’ve created a yaml config file for the following config:
- Venitlation unit (in my case a Storkair WHR 930), controlled via a Perilex Plug
- Old-fashioned 3-level switch to control the ventilation unit
- Shelly 2.5 to controll/influence the 3-level switch
These ventilation units are controlled relatively simple:
-when L1 is live/hot, the ventilation unit goes to medium
-when L2 is live/hot, the ventilation unit goed to high
-when L1 and L2 are not live, the ventilation unit goes to low
-it is not possible to have both L1 and L2 live/hot, the 3-level switch prevents that (middle position = both L1 and L2 are disconnected).
You simply connect output 1 and 2 of the 3-level switch to switch 1 and switch 2 of the Shelly 2.5. The outputs of the Shelly (L1 and L2) go to your ventilation unit.
Main features of the esphome solution below:
- It creates an user-friendly select entity to Home Assistant. This select-entity shows the values low. medium and high and the end-user can easily switch between them. This is much more intuitive than stuff like “switching switch 1 off and switching switch 2 on”.
- On power loss->restore, the Shelly will automatically switch the mode (low, medium or high) as is already set by the 3-level switch
- Protection: it is impossible to have both switch 1 on and switch 2 on at the same time
- Protection: overheating protection (both switches will be turned off if that happens).
substitutions:
devicename: ventilation
max_temp: "85.0"
esphome:
name: ${devicename}
friendly_name: Ventilation
platform: ESP8266
board: esp01_1m
comment: Shelly 2.5
# Ensures that, after a reboot, the ventilation will go to the state reflected by the physical knob. Since the relais go off first during the boot, the default value is already "Low" and does not need to be defined anymore.
on_boot:
if:
condition:
binary_sensor.is_on: switch_medium
then:
- select.set:
id: balansventilatie
option: "Medium"
else:
if:
condition:
binary_sensor.is_on: switch_high
then:
- select.set:
id: balansventilatie
option: "High"
# Enable logging
logger:
# Enable Home Assistant API
api:
encryption:
key: "your_encryption_key"
ota:
password: "your_password"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "your_hotspot_name"
password: "your_hotspot_password"
captive_portal:
i2c:
sda: GPIO12
scl: GPIO14
sensor:
- platform: ade7953
irq_pin: GPIO16 # Prevent overheating by setting this
voltage:
name: ${devicename} Voltage
# On the Shelly 2.5 channels are mixed ch1=B ch2=A
current_a:
name: ${devicename} Current B
current_b:
name: ${devicename} Current A
active_power_a:
name: ${devicename} Active Power B
# active_power_a is normal, so don't multiply by -1
active_power_b:
name: ${devicename} Active Power A
# active_power_b is inverted, so take the absolute value
filters:
- lambda: return abs(x);
update_interval: 60s
# NTC Temperature
- platform: ntc
sensor: temp_resistance_reading
name: ${devicename} Temperature
unit_of_measurement: "°C"
accuracy_decimals: 1
icon: "mdi:thermometer"
calibration:
b_constant: 3350
reference_resistance: 10kOhm
reference_temperature: 298.15K
on_value_range:
- above: ${max_temp}
then:
- switch.turn_off: Relay_Medium
- switch.turn_off: Relay_High
- homeassistant.service:
service: persistent_notification.create
data:
title: Message from ${devicename}
data_template:
message: Switch turned off because temperature exceeded ${max_temp}°C
- platform: resistance
id: temp_resistance_reading
sensor: temp_analog_reading
configuration: DOWNSTREAM
resistor: 32kOhm
- platform: adc
id: temp_analog_reading
pin: A0
status_led:
pin:
number: GPIO0
inverted: yes
switch:
- platform: gpio
id: Relay_Medium
name: ${devicename} Relay Medium
pin: GPIO4
icon: "mdi:electric-switch"
restore_mode: always_off
# Ensure only one switch at a time is on (https://esphome.io/components/switch/gpio.html#interlocking)
interlock: &interlock_group [Relay_Medium, Relay_High]
on_turn_on:
then:
- select.set:
id: balansventilatie
option: "Medium"
on_turn_off:
then:
- select.set:
id: balansventilatie
option: "Low"
- platform: gpio
id: Relay_High
name: ${devicename} Relay High
pin: GPIO15
icon: "mdi:electric-switch"
restore_mode: always_off
interlock: *interlock_group
on_turn_on:
then:
- select.set:
id: balansventilatie
option: "High"
on_turn_off:
then:
- select.set:
id: balansventilatie
option: "Low"
binary_sensor:
- platform: gpio
pin:
number: GPIO13
name: ${devicename} Switch Medium
id: switch_medium
publish_initial_state: false
on_press:
then:
- select.set:
id: balansventilatie
option: "Medium"
on_release:
then:
- select.set:
id: balansventilatie
option: "Low"
- platform: gpio
pin:
number: GPIO5
name: ${devicename} Switch High
id: switch_high
publish_initial_state: false
on_press:
then:
- select.set:
id: balansventilatie
option: "High"
on_release:
then:
- select.set:
id: balansventilatie
option: "Low"
select:
- platform: template
name: Balansventilatie
id: balansventilatie
options:
- "Low"
- "Medium"
- "High"
restore_value: false
optimistic: true
on_value:
then:
- lambda: |-
if (id(balansventilatie).state == "Low") {
id(Relay_Medium).turn_off();
id(Relay_High).turn_off();
} else if (id(balansventilatie).state == "Medium") {
id(Relay_Medium).turn_on();
} else if (id(balansventilatie).state == "High") {
id(Relay_High).turn_on();
}
End-result in Home Assistant:
I hope this helps others.
