AtomS3R-M12 ESPHome Integration

The AtomS3R-M12 ESPHome integration includes startup sequencing, an inertial sensor, PSRAM, and the OV3660 camera component.

1. Device Overview

Item	Information
Product	AtomS3R-M12
SKU	C126-M12
Main Functions	Camera, acceleration, gyroscope, and temperature data
Interfaces	I2C and camera parallel interface
ESPHome Components	`bmi270_bmm150` (external), `psram`, `esp32_camera`
ESPHome Version	/

2. Component Details

Startup Sequence

After AtomS3R-M12 is powered on, GPIO18 must be pulled low before the hardware buses are initialized; otherwise, communication with the inertial sensor may fail. The following action runs at a high boot priority:

esphome:
  name: atoms3r-m12
  friendly_name: AtomS3R-M12
  on_boot:
    priority: 800
    then:
      - lambda: |-
          gpio_set_direction(GPIO_NUM_18, GPIO_MODE_OUTPUT);
          gpio_set_level(GPIO_NUM_18, 0);
          vTaskDelay(pdMS_TO_TICKS(1500)); 

Startup Requirement

Pulling GPIO18 low is part of the normal device initialization. Do not remove it from the configuration or move it to a lower boot priority.

PSRAM

The camera frame buffer uses the official ESPHome PSRAM component:

psram:
  mode: octal
  speed: 80MHz 

BMI270/BMM150 External Component

ESPHome currently does not provide an official BMI270/BMM150 driver suitable for this device, so the community bmi270_bmm150 external component is used:

external_components:
  - source: github://DennisGaida/m5stack-atoms3r-components@main
    components: [bmi270_bmm150] 

Third-Party Component

This driver is provided by a community repository. See bmi270_bmm150 for the source and compatibility information.

Inertial Sensor

The external platform provides three-axis acceleration, three-axis gyroscope, and temperature entities:

i2c:
  - id: bmi270_i2c
    sda: GPIO45
    scl: GPIO0

sensor:
  - platform: bmi270_bmm150
    i2c_id: bmi270_i2c
    address: 0x68
    update_interval: 5s
    acceleration_x:
      name: "BMI270 Accel X"
    acceleration_y:
      name: "BMI270 Accel Y"
    acceleration_z:
      name: "BMI270 Accel Z"
    gyroscope_x:
      name: "BMI270 Gyro X"
    gyroscope_y:
      name: "BMI270 Gyro Y"
    gyroscope_z:
      name: "BMI270 Gyro Z"
    temperature:
      name: "BMI270 Temperature" 

OV3660 Camera

The OV3660 uses the official ESPHome ESP32 Camera component:

i2c:
  - id: camera_i2c
    sda: GPIO12
    scl: GPIO9
    frequency: 100kHz
    timeout: 10ms

esp32_camera:
  name: "OV3660 Camera"
  external_clock:
    pin: GPIO21
    frequency: 20MHz
  i2c_id: camera_i2c
  data_pins: [GPIO3, GPIO42, GPIO46, GPIO48, GPIO4, GPIO17, GPIO11, GPIO13]
  vsync_pin: GPIO10
  href_pin: GPIO14
  pixel_clock_pin: GPIO40
  resolution: 640X480
  jpeg_quality: 10 

3. Example

See atoms3r-m12-example.yaml for the complete configuration. It includes the network, API, GPIO18 startup sequence, third-party inertial sensor, PSRAM, and camera settings.

Home Assistant during device setup:

After the device is added, the camera and inertial sensor entities are available:

Home Assistant Dashboard examples:

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