Some Brazilian enthusiasts have hacked an ancient lift/elevator system with one goal in mind - the ability to send an email to call the lift to their level. Some of us thought the simply fitted an optocoupler and Arduino-related hardware to the local call button, however the hackers instead fitted an Arduino-controlled relay to the required contact in the lift control system. Furthermore the system can detect when the lift is at the required level and email the notification. Then the passenger can mozy on over to the car and start their ride. More in the following video:
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