Can't turn OLED display off

ESPHome
1

I’m using a SSD1306 128x64 OLED to show temperature data, like so:

display:
  - platform: ssd1306_i2c
    id: my_oled
    update_interval: .5s
    contrast: 0.0
    brightness: 0.0
    model: "SSD1306 128x64"
    rotation: 0
    address: 0x3C
    lambda: |-
      if (id(fire).state) {id(ani_fire).next_frame(); it.image(0, 0, id(ani_fire));}
      else {it.image(0, 0, id(home_thermometer));}
      it.printf(64, 4, id(font2), TextAlign::TOP_CENTER, " %.1f°", id(bedroom_temperature).state * (9.0/5.0) + 32.0);
      it.printf(0, 64, id(font3), TextAlign::BASELINE_LEFT, "   Set to: %.1f°", id(bedroom_thermostat).target_temperature_low * (9.0/5.0) + 32);

I want the display to remain dark until I press a button, then go out again after a delay. But, even though I have brightness and contrast set to zero, the display is lit. How can I make it stay dark until a switch event?

2

Again, docs say

  • brightness (Optional, percentage): Set display brightness in %. Only can be used with SSD1305. Defaults to 100%.

You don’t have a ssd1305.

1 Like
3

I know; thought I’d try it anyway. Take the brightness line out and leave in contrast: 0.0 and the display remains on.

4

I’ve never tried to make the display blank, but have you tried to print blanks or empty strings?

5

i use (for off)

            - lambda: id(my_screen).set_contrast(0.0);
            - lambda: id(my_screen).turn_off();

and (for on)

            - lambda: id(my_screen).turn_on();
            - lambda: id(my_screen).set_contrast(1.0);
2 Likes
6

Thanks; I’m a little unclear on using the lambda. Could you give an example of a switch that would turn off the oled screen?

7 
# Example configuration entry
switch:
  - platform: template
    name: "Template Switch"
    lambda: |-
      if (......) {
        return true;
      } else {
        return false;
      }
    turn_on_action:
      - lambda: .....
    turn_off_action:
      - lambda: .....