[SOLVED] Need help displaying a variable from a sensor to an oled display

ESPHome
1

Hi,
I am trying to take a reading from a temp sensor and display it on an oled, I can read the sensor and display simple text on the display but when I try and display the variable I get errors, I’m new to this and I’m sure I’m missing somethinf simple.

Here is the code

esphome:
  name: humdisp
  friendly_name: Humdisp

esp8266:
  board: esp01_1m

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "z+iQbjCQbN2Ic+3H9okL+eTWqp6pCniUhyBa/7Ci64c="

ota:
  password: "5b0a9e23794cd0d26f7c06ba30d69369"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Humdisp Fallback Hotspot"
    password: "oW7nPzEYNUsU"

captive_portal:

sensor:
  - platform: dht
    pin: GPIO0
    temperature:
      id: "temp"
      name: "Temperature"
    humidity:
      id: "hum"
      name: "Humidity"
    # Update intervel in Seconds
    update_interval: 30s
    model: DHT11

font:
  - file: "arial.ttf"
    id: my_font
    size: 20

i2c:
  sda: GPIO4 
  scl: GPIO5 
  frequency: 800kHz

display:
  - platform: ssd1306_i2c
    model: "SSD1306 128x64"
    address: 0x3C
    lambda: |-
      it.print(0, 0, id(my_font), "%.1f°", id(temp).state);
2

What are the errors ?

Do you need to use it.printf as it’s formatted text ?

3

Hi,

The errors look like this -

INFO ESPHome 2023.8.3
INFO Reading configuration /config/esphome/humdisp.yaml...
INFO Generating C++ source...
INFO Compiling app...
Processing humdisp (board: esp01_1m; framework: arduino; platform: platformio/[email protected])
--------------------------------------------------------------------------------
HARDWARE: ESP8266 80MHz, 80KB RAM, 1MB Flash
Dependency Graph
|-- ESPAsyncTCP-esphome @ 1.2.3
|-- ESPAsyncWebServer-esphome @ 2.1.0
|-- DNSServer @ 1.1.1
|-- ESP8266WiFi @ 1.0
|-- ESP8266mDNS @ 1.2
|-- noise-c @ 0.1.4
|-- Wire @ 1.0
Compiling /data/humdisp/.pioenvs/humdisp/src/main.cpp.o
/config/esphome/humdisp.yaml: In lambda function:
/config/esphome/humdisp.yaml:58:52: error: no matching function for call to 'esphome::display::Display::print(int, int, esphome::font::Font*&, const char [7], float&)'
   58 |       it.print(0, 0, id(my_font), "%.1f°", id(temp).state);
      |                                                   ^
In file included from src/esphome.h:18,
                 from src/main.cpp:3:
src/esphome/components/display/display.h:215:8: note: candidate: 'void esphome::display::Display::print(int, int, esphome::display::BaseFont*, esphome::Color, esphome::display::TextAlign, const char*)'
  215 |   void print(int x, int y, BaseFont *font, Color color, TextAlign align, const char *text);
      |        ^~~~~
src/esphome/components/display/display.h:215:8: note:   candidate expects 6 arguments, 5 provided
src/esphome/components/display/display.h:225:8: note: candidate: 'void esphome::display::Display::print(int, int, esphome::display::BaseFont*, esphome::Color, const char*)'
  225 |   void print(int x, int y, BaseFont *font, Color color, const char *text);
      |        ^~~~~
src/esphome/components/display/display.h:225:50: note:   no known conversion for argument 4 from 'const char [7]' to 'esphome::Color'
  225 |   void print(int x, int y, BaseFont *font, Color color, const char *text);
      |                                            ~~~~~~^~~~~
src/esphome/components/display/display.h:235:8: note: candidate: 'void esphome::display::Display::print(int, int, esphome::display::BaseFont*, esphome::display::TextAlign, const char*)'
  235 |   void print(int x, int y, BaseFont *font, TextAlign align, const char *text);
      |        ^~~~~
src/esphome/components/display/display.h:235:54: note:   no known conversion for argument 4 from 'const char [7]' to 'esphome::display::TextAlign'
  235 |   void print(int x, int y, BaseFont *font, TextAlign align, const char *text);
      |                                            ~~~~~~~~~~^~~~~
src/esphome/components/display/display.h:244:8: note: candidate: 'void esphome::display::Display::print(int, int, esphome::display::BaseFont*, const char*)'
  244 |   void print(int x, int y, BaseFont *font, const char *text);
      |        ^~~~~
src/esphome/components/display/display.h:244:8: note:   candidate expects 4 arguments, 5 provided
*** [/data/humdisp/.pioenvs/humdisp/src/main.cpp.o] Error 1
========================== [FAILED] Took 2.16 seconds ==========================

I have no idea if I should be using it.printf or something else, I’ve just been copying what others have done and trying to match it to what I want

4

yes, replace it.print with it.printf, if you use anything other than static text

5

That was the problem !!

Thank you so much

6

No worries, can you mark this as solved ?

1 Like
7

Holy cow, came across this because I had my config working at one time perfectly but for some reason, I couldn’t get sensor data to populate any more on my display. I had to re do my config on the same device. After reading this I totally forgot to add the device via esphome integration lol. So thank you guys for posting this.