Arduino and the real world

  • A system installed outdoors using an Arduino Mega + Ethernet shield to send DHT11 and other sensor data to a remote server
  • Completed continuous 2 year operation on July 12 2021
  • Server uses Linux+PHP+MySQL
  • 1826506 records on the database
  • Highcharts used to plot graph with data
  • Average time to query MySQL table with 1.8 Millions records takes about 1 second. Server is a virtual machine at 2GHz with 4GB RAM / standard virtual hard disk. Table has only the primary key, without additional indexes
  • Low cost! Parts cost was about 25 dollars
  • Based (with many modifications) on: and
  • Today is very cold at São Carlos, the Brazilian capital of technology! 😉

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