Hello fellow Home Assistant enthusiasts! 
I wanted to share my recent experience setting up an ESPHome display to show outdoor temperature. It’s been a bit of a learning curve, but I’m thrilled with how it turned out!
I followed the official ESPHome guide for setting up a Time & Temperature display on an OLED screen. The idea was to pull the outdoor temperature from a sensor entity in Home Assistant (sensor.outside_temperature) and display it on the ESPHome device. Here’s a quick overview of my setup:
sensor:
- platform: homeassistant
id: OutsideTemp
entity_id: sensor.outside_temperature
internal: true
lcd_pcf8574:
- id: my_display
dimensions: 20x4
address: 0x27
lambda: |
if (id(OutsideTemp).has_state()) {
it.printf(0,2,“Outside: %.1f”, id(OutsideTemp).state);
} else {
it.print(0,2,“No outside Temp”);
}
At first, I was frustrated because it kept showing “No outside Temp” despite the sensor being available in Home Assistant. After some troubleshooting, I realized the issue was with the internal: true flag. Once I removed that, the display started updating correctly! 
This project has been a great way to dive deeper into ESPHome and understand how it interacts with Home Assistant. It’s also a nice visual reminder of the current outdoor conditions, which helps me decide whether to bundle up before heading out! 
If anyone has tips for improving the display or suggestions for other sensors to add, I’d love to hear them! Happy coding and happy automating! 