scale

Pet Food Bowl Scale (Pet Scale)

This project is a smart pet (cat) food bowl scale built by assembling the M5Stack AtomS3R-M12 and the M5Stack Unit-Mini Scales using Lego bricks. It allows you to monitor food weight and check on your pet via live camera feed.

Features

• Precision Weight Monitoring: Tracks real-time weight and absolute weight of the pet food bowl.
• Live Video Streaming: Streams video at 320x240 @ 2fps YUV422 using the AtomS3R-M12's onboard GC0308 camera.
• Tare Control: Zero-point calibration to subtract the food bowl's base weight.
• Status RGB LED: Controls the addressable WS2812 RGB LED built into the Unit-Mini Scales.
• Digital Filters: Fine-tunes sensor readings with low-pass (LP), average, and exponential moving average (EMA) filters.

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ESPHome Configuration Usage

To use this package, add the following to your ESPHome configuration file:

substitutions:
  name: "esp-atom-scale"
  friendly_name: "ESP Atom Scale"

packages:
  remote:
    refresh: always
    url: https://github.com/eigger/espcomponents
    ref: master
    files:
      - packages/device_base.yaml
      - packages/esp32.yaml
      - packages/scale/pet_scale.yaml

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Before first use

Provide the Wi-Fi/OTA secrets required by the shared base. The scale preset already selects ESP32-S3 / ESP-IDF and octal PSRAM; it targets AtomS3R-M12 rather than a generic Atom board. Confirm that the I2C scale appears at 0x26, tare the empty bowl, and use the MINI calibration procedure if a known weight reads incorrectly.

Hardware Specifications & Pin Mapping

Devices

M5Stack AtomS3R-M12	M5Stack Unit-Mini Scales

1. Weight Sensor (I2C)

The Unit-Mini Scales is connected via the Grove port:

• SDA: GPIO2
• SCL: GPIO1
• I2C Address: 0x26

2. Camera Module

The onboard GC0308 camera on the AtomS3R-M12 uses the following pin map:

• I2C SDA: GPIO12 (CAM_SDA)
• I2C SCL: GPIO9 (CAM_SCL)
• Camera Power/Init Pin: GPIO18 (Inverted, must be turned ON at boot)
• VSYNC / HREF / PCLK: GPIO10 / GPIO14 / GPIO40
• Data Pins (Y2-9): [GPIO3, GPIO42, GPIO46, GPIO48, GPIO4, GPIO17, GPIO11, GPIO13]

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Gallery (Assembly & Operation)

Photo	Description
	1. Before Assembly: AtomS3R-M12 and Unit-Mini Scales before Lego assembly.
	2. Assembled: Assembled Lego structure with the AtomS3R-M12 and Unit-Mini Scales.
	3. With Food Bowl: The assembled Lego scale structure with the pet food bowl placed on it.
	4. Placement (No Bowl): The setup positioned at the actual feeding spot (without the bowl).
	5. Final Setup: The final setup positioned at the actual feeding spot with the food bowl ready.
	6. Home Assistant Dashboard: Real-time entities, controls, and sensor values displayed in the Home Assistant UI.