XIAO Expansion board: 2x Grove connectors limited to I2C?

Products & Technology XIAO
6

I have 2 I2C Grove devices and the display working. You do have to specify the correct address for all 3 or they won’t work. I’ve got a temperature/humidity sensor hooked up to one and a barometric pressure sensor hooked up to the other with output to the OLED display using Home Assistant and ESPHome. You should be able to find the correct addresses on ESPHomes documentation although I noticed the default addresses were listed on the sensor packages but I can confirm it works with a ESP32-C3 XiAO. Below is most of my configuration file is ESPHome and it all works. They are all using the same 2 pins.

i2c:
sda: 6
scl: 7

sensor:

  • platform: wifi_signal
    name: seeed-hk47 WiFi signal
    update_interval: 10s

  • platform: uptime
    name: seeed-hk47 uptime

  • platform: sht3xd
    temperature:
    name: “hk47 temperature”
    id: temperature_hk47
    filters:
    - lambda: return x * (9.0/5.0) + 32.0;
    unit_of_measurement: “°F”
    humidity:
    name: “hk47 humidity”
    id: humidity_hk47
    address: 0x45
    update_interval: 30s

  • platform: dps310
    temperature:
    name: “hk47 pressure temp”
    id: temp_hk47
    pressure:
    name: “hk47 pressure”
    id: pressure_hk47
    address: 0x77
    update_interval: 30s

font:

  • file: “fonts/arial.ttf”
    id: tnr1
    size: 12
  • file: “fonts/Roboto-Bold.ttf”
    id: tnr2
    size: 52
  • file: “fonts/Insominia.ttf”
    id: tnr3
    size: 64
  • file: “fonts/Times New Roman.ttf”
    id: tnr4
    size: 51
  • file: “fonts/Insominia.ttf”
    id: tnr7
    size: 60
  • file: “fonts/Roboto-Bold.ttf”
    id: tnr5
    size: 48
  • file: “fonts/arial.ttf”
    id: tnr6
    size: 18
  • file: “fonts/Roboto-Bold.ttf”
    id: tnr8
    size: 28
  • file: “fonts/arial.ttf”
    id: tnr9
    size: 40
  • file: “fonts/Roboto-Bold.ttf”
    id: tnr10
    size: 34
  • file: “fonts/arial.ttf”
    id: tnr11
    size: 28

display:

  • platform: ssd1306_i2c
    model: “SSD1306 128x64”
    id: my_display
    address: 0x3C
    invert: true
    rotation: 0°
    pages:
    • id: page1
      lambda: |-
      if (id(temperature_hk47).has_state()) {
      it.printf(64, 50, id(tnr2), TextAlign::BASELINE_CENTER, “%.1f°”, id(temperature_hk47).state);
      }
    • id: page2
      lambda: |-
      if (id(humidity_hk47).has_state()) {
      it.printf(64, 56, id(tnr3), TextAlign::BASELINE_CENTER, “%.1fH”, id(humidity_hk47).state);
      }
    • id: page3
      lambda: |-
      if (id(pressure_hk47).has_state()) {
      it.printf(6, 40, id(tnr5), TextAlign::BASELINE_LEFT, “%.0f”, id(pressure_hk47).state);
      it.print(6, 56, id(tnr1), TextAlign::BASELINE_LEFT, “barometric pressure”);
      }
    • id: page4
      lambda: |-
      if (id(pir_hk47).state) {
      it.print(60, 16, id(tnr6), TextAlign::BASELINE_CENTER, “I SEE”);
      it.print(64, 60, id(tnr9), TextAlign::BASELINE_CENTER, “YOU!”);
      } else {
      it.print(0, 26, id(tnr11), TextAlign::BASELINE_LEFT, “HEY!”);
      it.print(72, 58, id(tnr10), TextAlign::BASELINE_CENTER, “LOOK”);
      }
    • id: page5
      lambda: |-
      if (id(temperature_hk47).has_state()) {
      it.strftime(64, 50, id(tnr5), TextAlign::BASELINE_CENTER, “%H:%M”, id(estime).now());
      }

For example cycle through pages on a timer

interval:

  • interval: 5s
    then:
    • display.page.show_next: my_display
    • component.update: my_display