Hardware prototype code for sensing elevator movement.
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Measures acceleration to find out if an elevator works and updates its status on accessibility.cloud.

Design / photos

This is how the sensor looks:

image image image

Technical specification

  • Plug & Play installation using the maintenance 230V AC connector on top of the elevator's cabin
  • Typical power consumption <1W, micro USB power adapter
  • Sets the elevator's status to 'unknown' on accessibility.cloud if it has not been in use within typical usage time intervals
  • M2M Nano SIM card leverages a comprehensive network of carriers to provide service in over 100 countries out of the box
  • Built-in 150mA battery to actively send a maintenance event in case the device is actively unplugged
  • Open source design based on Particle Electron IoT platform
  • Analog Devices ADXL335 3-Axis ±3 g acceleration sensor
  • U-blox SARA-U260/U270 3G module for communication with accessibility.cloud
  • STM32F205RGT6 120MHz ARM Cortex M3 microcontroller
  • 1MB flash, 128KB RAM
  • Allows firmware updates over-the-air
  • RGB status LED
  • Real-time operation system (RTOS)