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All Projects → newAM → Loadcelloccupany

newAM / Loadcelloccupany

Licence: mit
Home automation occupancy sensor using load cells

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arduinomqtthome-assistanthome-automationethernet

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Load Cell Occupancy Sensor

What is it?

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.

Why?

Other bed occupancy sensors that I have used in my home automation setup trigger false negatives when rolling around at night. I use bed occupancy to turn on my lights if I get up at night, and I wanted a faster, more accurate solution.

Why PoE?

Wireless home automation devices often make sense only when they are battery powered, if a power cable needs to be run to the device it can carry data too. Designing a low power wireless device is far more complicated than designing a wired device and running an Ethernet cable.

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

Media

Home Assistant Card

Front Circuit View

Software Used

Arduino Libraries used

Forks

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