Hello,
I am working on a project where I need to display real-time data from ‘‘Home Assistant’’ onto an ‘‘LCD screen’’. I am looking for an efficient and time-saving approach to achieve this.
Could someone suggest the best method to accomplish this with minimal delay and complexity?
You have a few options - these are just the ones that I have tried:
I’m not sure what you mean by the quotes on “Home Assistant” and “LCD screen.”
Hopefully the posts before me point you towards a high-level solution. If not, though, you need to be more specific about what “real-time data” and what “LCD screen,” and how, if at all, it’s connected to Home Assistant. Without that information, it’s hard to point you in a direction that’s specific to what you need.
Welcome to the forum. There are many people here who try very hard to help newcomers, and you should be able to find the assistance you need here.
Hi, thanks for following my question!
By real-time data, I mean the current status of the battery as displayed on Home Assistant, including battery power, voltage, wind, and current sensor readings. My project is to display this information on an LCD screen.
To do this, I am using a microcontroller that retrieves the data from Home Assistant and updates the LCD. Furhermore, I would like to tell you that access to Home Assistant is secured with some private credentials.
I want to make sure the LCD updates properly as the data changes in Home Assistant. Any advice on how to achieve this smoothly?
Thanks in advance
I’m using ESPHome to display the measurements of an outdoor sensor to display temperature and humidity on a TTGO-Display.
esphome:
name: display-1
esp32:
board: featheresp32
font:
- file: 'slkscr.ttf'
id: font_slkscr_8
size: 8
# glyphs: [!%()+,-/_.:°0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz]
- file: 'slkscr.ttf'
id: font_slkscr_16
size: 16
# glyphs: [!%()+,-/_.:°0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz]
- file: 'BebasNeue-Regular.ttf'
id: font_bebas_48
size: 48
- file: 'arial.ttf'
id: font_arial_12
size: 12
color:
- id: color_white
red: 1
green: 1
blue: 1
- id: color_red
red: 1
green: 0
blue: 0
- id: color_green
red: 0
green: 1
blue: 0
- id: color_blue
red: 0
green: 0
blue: 1
- id: color_orange
red: 1
green: 0.6
blue: 0
- id: color_yellow
hex: ffff00
- id: color_dark_orange
hex: ff8c00
- id: color_teal_blue
red: 0
green: 0.5
blue: 0.45
- id: color_tomato
hex: FF6347
- id: color_whiskey
hex: d29062
- id: color_dark_pink
hex: cb416b
- id: color_grape
hex: 5d1451
- id: color_lavender
hex: d5c9dd
- id: color_arctic_blue
hex: 95d6dc
- id: color_sapphire
hex: 09577B
- id: color_light_blue
hex: add8e6
# Enable logging
logger:
level: DEBUG
# Enable Home Assistant API
api:
encryption:
key: "kaLYjSYIg3WK91mgfgWlnjhtUq/KuUOB/L3fEhUA/8c="
ota:
platform: esphome
password: "eb0056095af6c6bdbe204b22bfb4adc3"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
domain: ".fritz.box"
fast_connect: True
# Optional manual IP
manual_ip:
static_ip: 192.168.178.95
gateway: 192.168.178.1
subnet: 255.255.255.0
dns1: 192.168.178.1
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Display-1 Fallback Hotspot"
password: "xfoC8woX5yd9"
captive_portal:
web_server:
port: 80
spi:
clk_pin: GPIO18
mosi_pin: GPIO19
time:
- platform: homeassistant
timezone: Europe/Berlin
id: esptime
binary_sensor:
- platform: template
name: "Display Power State"
lambda: |-
if (id(vcc).state > 4.3) {
// Power is On.
return true;
} else {
// Power is Off.
return false;
}
sensor:
- platform: homeassistant
id: bthome_sensor_094e_temperature
entity_id: sensor.bthome_sensor_b5a3_temperature
unit_of_measurement: '°C'
- platform: homeassistant
id: bthome_sensor_094e_voltage
unit_of_measurement: 'V'
entity_id: sensor.bthome_sensor_b5a3_voltage
- platform: homeassistant
id: bthome_sensor_094e_humidity
entity_id: sensor.bthome_sensor_b5a3_humidity
unit_of_measurement: '%'
- platform: adc
pin: 34
accuracy_decimals: 2
attenuation: auto #11db
name: VBatt
id: vcc
update_interval: 60s
filters:
- multiply: 2.0 # The voltage divider requires us to multiply by 2
- platform: template
name: batterylevel
id: batterylevel
unit_of_measurement: '%'
update_interval: 60s
lambda: |-
// I know infering the battery from voltage only is misleading, but I'll take it. Considering linear decay (again, i'll take it), max=2.23, min=1.38
// battery_percentage = 100 * (adc - BATTERY_MIN_ADC) / (BATTERY_MAX_ADC - BATTERY_MIN_ADC);
if (id(vcc).state > 4.3) {return 101;}
else {return (100*(id(vcc).state-3.3)/(4.2-3.3));}
on_value:
then:
- lambda: |-
if (id(vcc).state < 4.3) {
auto call = id(back_light).turn_on();
call.set_brightness(id(batterylevel).state/100);
call.perform();
}
else {
auto call = id(back_light).turn_on();
call.set_brightness(1.0);
call.perform();
}
# ESP_LOGI("display-1", "Value of batterylevel: %f", id(batterylevel).state);
# ESP_LOGI("display-1", "Value of backlight: %f", id(back_light).current_values.get_brightness());
# - light.dim_relative:
# id: gpio_04_backlight_pwm
# level: batterylevel.state
# Define a PWM output on the ESP32
output:
- platform: ledc
pin: GPIO04
id: gpio_04_backlight_pwm
# Define a monochromatic, dimmable light for the backlight
light:
- platform: monochromatic
output: gpio_04_backlight_pwm
name: "Display Backlight"
id: back_light
restore_mode: RESTORE_AND_ON
# TODO brightness
display:
- platform: ili9xxx
model: st7789v
#TTGO TDisplay 135x240
dimensions:
height: 240
width: 135
offset_height: 40
offset_width: 52
# Required or the colors are all inverted, and Black screen is White
invert_colors: true
cs_pin: GPIO5
dc_pin: GPIO16
reset_pin: GPIO23
rotation: 90°
update_interval: 15s
lambda: |-
// comment
if (id(vcc).state < 4.3) {it.printf(4, 4, id(font_slkscr_16), id(color_teal_blue), "%.1f VBat (%.1f%%)", id(vcc).state, id(batterylevel).state);}
else {it.printf(4, 4, id(font_slkscr_16), id(color_teal_blue), "%.1f VIn (Charging)", id(vcc).state);}
it.strftime(180, 16, id(font_slkscr_16), id(color_teal_blue), TextAlign::BASELINE_LEFT, "%H:%M", id(esptime).now());
it.printf(16, 18, id(font_bebas_48), id(color_white), "Temp");
it.printf(120, 18, id(font_bebas_48), id(color_white), "Humi");
if(id(bthome_sensor_094e_temperature).has_state()) {
float temp = id(bthome_sensor_094e_temperature).state;
if (temp > 24.0) {it.printf(16, 72, id(font_bebas_48), id(color_tomato), "%.1f°" ,id(bthome_sensor_094e_temperature).state);}
else if (temp > 18.0) {it.printf(16, 72, id(font_bebas_48), id(color_whiskey), "%.1f°" ,id(bthome_sensor_094e_temperature).state);}
else if (temp > 12.0) {it.printf(16, 72, id(font_bebas_48), id(color_dark_orange), "%.1f°" ,id(bthome_sensor_094e_temperature).state);}
else if (temp > 6.0) {it.printf(16, 72, id(font_bebas_48), id(color_dark_pink), "%.1f°" ,id(bthome_sensor_094e_temperature).state);}
else if (temp = 0.0) {it.printf(16, 72, id(font_bebas_48), id(color_lavender), "%.1f°" ,id(bthome_sensor_094e_temperature).state);}
else if (temp > -5.0) {it.printf(16, 72, id(font_bebas_48), id(color_arctic_blue), "%.1f°" ,id(bthome_sensor_094e_temperature).state);}
else {it.printf(16, 72, id(font_bebas_48), id(color_sapphire), "%.1f°" ,id(bthome_sensor_094e_temperature).state);}
}
if (id(bthome_sensor_094e_humidity).has_state()) {
float humi = id(bthome_sensor_094e_humidity).state;
if (humi > 60.0) {it.printf(120, 72, id(font_bebas_48), id(color_light_blue), "%.1f%%", id(bthome_sensor_094e_humidity).state);}
else if (humi > 40) {it.printf(120, 72, id(font_bebas_48), id(color_green), "%.1f%%", id(bthome_sensor_094e_humidity).state);}
else {it.printf(120, 72, id(font_bebas_48), id(color_yellow), "%.1f%%", id(bthome_sensor_094e_humidity).state);}
}
text_sensor:
- platform: version
name: "ESPHome Version"
number:
- platform: template
<<: *AnchorDelay
id: "SwitchMainDelay"
name: "Main Switch Delay"
- platform: template
<<: *AnchorDelay
id: "SwitchAuxDelay"
name: "Aux Switch Delay"
I have found most of the building blocks here in the forum, thank you to all contributors.
Hi there, i used your code and get:
INFO ESPHome 2025.3.3
INFO Reading configuration /config/esphome/esphome-web-f64b34.yaml…
ERROR Error while reading config: Invalid YAML syntax:
found undefined alias ‘AnchorDelay’
in “/config/esphome/esphome-web-f64b34.yaml”, line 243, column 9
any ideas, no worries if you don’t ))
I forgot to delete those lines. They are leftovers from some tests i did. Just delete all lines at the end after number: (incl.)
Thank you !