Load Cell Occupancy Sensor

    This project is a occupancy sensor that uses a load cell for couches and beds, transmitting data to my Home Assistant server via MQTT over Ethernet.
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    ORIGINAL POST
    By Alex
    details

    LoadCell_Media_HASSCard.png mail box

    Overview

    Load cells → HX711 (ADC) → ATMega328P (MCU) → W5100 (Ethernet) → MQTT Broker → Home Assistant

    This sensor takes input from 4 load cells, each supporting one leg of a bed or couch. The load cells are sampled with a ATMega328P (Arduino) using an HX711 load cell ADC. These samples are then transmitted to an MQTT broker via the Wiznet W5100 (same as Arduino Ethernet shield).

    Project Contents

    • LoadCell_ArduinoCode – firmware for the ATMega328P
    • LoadCell_Case – 3D printable case designed in OpenSCAD
    • LoadCell_Holder – 3D printable holder for the load cells designed in OpenSCAD
    • LoadCell_HomeAssistant – example Home Assistant configuration
    • LoadCell_KiCAD – schematic and PCB

     

    Original Link: https://github.com/newAM/LoadCellOccupany

    LoadCell_Media_HASSCard.png mail box

    Overview

    Load cells → HX711 (ADC) → ATMega328P (MCU) → W5100 (Ethernet) → MQTT Broker → Home Assistant

    This sensor takes input from 4 load cells, each supporting one leg of a bed or couch. The load cells are sampled with a ATMega328P (Arduino) using an HX711 load cell ADC. These samples are then transmitted to an MQTT broker via the Wiznet W5100 (same as Arduino Ethernet shield).

    Project Contents

    • LoadCell_ArduinoCode – firmware for the ATMega328P
    • LoadCell_Case – 3D printable case designed in OpenSCAD
    • LoadCell_Holder – 3D printable holder for the load cells designed in OpenSCAD
    • LoadCell_HomeAssistant – example Home Assistant configuration
    • LoadCell_KiCAD – schematic and PCB

     

    Original Link: https://github.com/newAM/LoadCellOccupany

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