What’s the actual error?
I get it to work, with only the display, or only the dht22, but dropping the dht22 is no an option, since that is the goal with the project… so i think i don’t have enough ram, and i’m trying to shorten the code as much as i can, but still to large…
ill post it here when i get it 
error 9 if i remember correct
now i get this: *** [.pioenvs/dht22/src/esphome/components/captive_portal/captive_portal.o] Source src/esphome/components/captive_portal/captive_portal.cpp' not found, needed by target .pioenvs/dht22/src/esphome/components/captive_portal/captive_portal.o’.
I have an unused arduino uno laying around, you think that one can run all this?
web_server paragraf uses ALOT of ram i found out…
I thought clean build was only to erase the text and start over xD now i have done it, i will come back with how it went…
Now i’m trying everything you told me and will start compiling and come back to you with the results I appreciate you’re help 
one question… if i only change one line or one letter in the yaml, i chose the install, it takes so long time, like 45 min or more… like 1000 compilings that takes for ever, even if I change just one letter or the whole code.
Compiling esphome on, e.g., a rpi will always take ages.
ESPHome is best hosted on a decently powerful PC/server, but that’s an endeavor for another day 
Okok, thank you, just what i thought, I run it on an rasberry pie 3, and I calculated a little on this, and if my calculation are correct, my pi is actually on the “line” of being supported for haos, Haos can barely be run on it, i will install it on an old laptop i have when i’m successful with the dht sensor code…
something is wrong :S
Now i got all the way to finish without error with the SAME code i used, only with “clean build” but now nothing works!
The only differents is i changed: esp32: board: seeed_xiao_esp32c3 variant: ESP32C3 framework: type: esp-idf
from: esp32: board: esp32-c3-devkitm-1 variant: esp32c3 framework: type: esp-idf
since it is the right one… I have the Xiao esp32c3 not the dev kit
I will try with the dev kit settings again, only prob is every time i want to change like i said only a letter, i have to wait 4820 seconds! going to take me like a month to get haos to work xD
Ok? wtf??? Now it working!!! i only did an firmware update and everything just clicked for some reason… Now all i have to be able to do is: Get the temperature and the humidity on the oled display…
esphome:
name: hemmis
friendly_name: hemmis
esp32:
board: seeed_xiao_esp32c3
variant: ESP32C3
framework:
type: esp-idf
# Enable logging
logger:
# Enable Home Assistant API
api:
encryption:
key: "6Q6KlUXNo/sFmWFl95FQ9w+xrD0wGvPkI9nhIRYOKbo="
ota:
password: "3e0cf106f66397e5c25b617030953960"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Hemmis Fallback Hotspot"
password: "BDjQBIjT7kdG"
captive_portal:
web_server:
sensor:
- platform: dht
model: AUTO_DETECT
pin: 2
temperature:
name: "Temperature"
humidity:
name: "Humidity"
update_interval: 15s
i2c:
sda: GPIO6
scl: GPIO7
scan: False
display:
- platform: ssd1306_i2c
model: "SSD1306 128x64"
address: 0x3C
lambda: |-
it.print(0, 0, id(font1), "Hello World!");
font:
- file: 'Roboto-Regular.ttf'
id: font1
size: 12
sensor:
- platform: dht
id: dht_sensor
lambda: |-
it.printf(0, 0, id(font1), TextAlign::TOP_LEFT, "%.1f°", id(dht_sensor).state);
I have never been on a new system that is this troubling… get errors no matter what changes, do one change new error another and so on…
Now i have: /config/esphome/hemmis.yaml: In lambda function:
/config/esphome/hemmis.yaml:52:67: error: expected primary-expression before ‘-’ token
it.printf(0, 0, id(font1), TextAlign::TOP_LEFT, “%.1f°”, id(dht-sensor).state);
^
/config/esphome/hemmis.yaml:52:74: error: expected primary-expression before ‘)’ token
it.printf(0, 0, id(font1), TextAlign::TOP_LEFT, “%.1f°”, id(dht-sensor).state);
^
*** [.pioenvs/hemmis/src/main.o] Error 1
========================= [FAILED] Took 116.88 seconds =========================
I’m biting myself in the tongue here, trying to be as patience i can be, but it’s really frustrating, when someone tell me about this great haos system that makes everything easier , and all i want, is to show the temp and hum on an oled xD
And even that takes like 20 people trying on 4 different forums, 100 different errors, and still havent got this to work… and i have like 15 more project i wanted to do, jesus …
/config/esphome/hemmis.yaml: In lambda function:
/config/esphome/hemmis.yaml:53:73: error: ‘class esphome::dht::DHT’ has no member named ‘state’; did you mean ‘update’?
it.printf(0, 0, id(font1), TextAlign::TOP_LEFT, “%.1f°”, id(dht_sensor).state);
^~~~~
update
I couldn’t use dht_sensor for some strange haos reason… i just changed it to dhtt and id dhtt and now im compiling xD frustrating…
new error … no member names state did you mean update? xD