So we have this trusty old Tefal Raclette. We’re very fond of it, nice to enjoy slow-food with friends.
Problem is that the on/off switch went haywire, gave up completely.
So we checked, the spare part was very expensive, and the newer models weren’t as nice as ours with a nice wooden base.
Therefore I decided to fix it by adding my own relay to it.
Parts I needed:
A relay with an esp01s (or double relay) (I chose this)
A PSU for it, 5V or 12V depending on the board above (I got this).
A button to turn it on and of locally.
A LED to indicate whether it was on or off ( I decided to use a button with an LED in it)
Placing these small components in the unit was tricky, there is not much room in it, and I fear it gets rather hot down there. But I got them placed, and fixed them to the ‘chassic’ with hot-glue.
After that, I placed some cork on top of the electronics to at least attempt to shield it from the heat (I cut up an old table protector).
So one relay for the 230V, and one relay for the 5V LED in the button.
I still need a 3D printed plate for the button, but for now it’s just hot-glued to the chassis.
I built in a 120 min delay in the relay, so if you forget to turn it off, it will automatically turn off after 2 hours.
The code exposes the LED and the relay to HA, the relay will change the LED, but the LED will not swtich the relay, so in the future I could add some signalling functions in the LED.
The code looks like this (thanks to @tom_l for helping out with the pushbutton)
substitutions:
device_name: raclette
esphome:
name: ${device_name}
platform: ESP8266
board: esp01_1m
# on_boot:
# then:
# - switch.turn_on: relay
# - light.turn_on: buttonlight
wifi:
ssid: !secret wifissid
password: !secret wifipw
reboot_timeout: 60min
manual_ip:
static_ip: 10.11.13.99
gateway: 10.11.13.1
subnet: 255.255.255.0
fast_connect: true
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "${device_name} Hotspot"
password: !secret appw
# Enable Home Assistant API
api:
ota:
password: !secret otapw
time:
- platform: homeassistant
id: homeassistant_time
# Enable logging
logger:
baud_rate: 0 #need this to free up UART pins
uart:
baud_rate: 115200 # speed to STC15L101EW
tx_pin: GPIO1
rx_pin: GPIO3
web_server:
port: 80
auth:
username: !secret webuser
password: !secret webpw
# Timer for auto turnoff
script:
id: countdown
then:
- delay: 120min # timer length
- switch.turn_off: relay
# Text Sensor with general information
text_sensor:
- platform: version
name: '${device_name} ESPHome Version'
- platform: wifi_info
ip_address:
name: '${device_name} ip'
ssid:
name: '${device_name} ssid'
binary_sensor:
- platform: gpio
id: button
internal: true
pin:
number: GPIO2
mode: INPUT_PULLUP
# inverted: true
on_press:
- switch.toggle: relay
filters:
- delayed_off: 10ms
sensor:
- platform: wifi_signal
name: '${device_name} wifi signal'
update_interval: 60s
accuracy_decimals: 0
- platform: uptime
name: '${device_name} uptime'
unit_of_measurement: days
update_interval: 300s
accuracy_decimals: 1
filters:
- multiply: 0.000011574
switch:
- platform: template
name: 'Raclette'
id: relay
turn_on_action:
- light.turn_on: buttonlight
- script.execute: countdown
- delay: 1s
- uart.write: [0xA0, 0x01, 0x01, 0xA2]
turn_off_action:
- script.stop: countdown
- uart.write: [0xA0, 0x01, 0x00, 0xA1]
- delay: 1s
- light.turn_off: buttonlight
optimistic: true
output:
- platform: template
type: binary
id: light_relay
write_action:
- if:
condition:
light.is_on: buttonlight
then:
uart.write: [0xA0, 0x02, 0x01, 0xA3]
else:
uart.write: [0xA0, 0x02, 0x00, 0xA2]
light:
- platform: binary
id: buttonlight
name: Powerindicator
output: light_relay
I’m going to experiment with shorter delays, something like 300ms if ‘delay’ understands that, just to make it more ‘reactive’.
But it works, and the electonics doesn’t get that hot:
