rack-cooling

Rack fan controller for

http://www.roger.de/wp-content/uploads/2015/08/Wandgehaeuse-Mininet.pdf

Arduino Pro Mini

https://www.arduino.cc/en/Main/ArduinoBoardProMini

DS18S20 1-Wire Parasite-Power Digital Thermometer https://www.maximintegrated.com/en/products/analog/sensors-and-sensor-interface/DS18S20.html

Cisco SG300-28PP 28-port Gigabit PoE+ Managed Switch: http://www.cisco.com/c/en/us/support/switches/sg300-28pp-28-port-gigabit-poe-plus-managed-switch/model.html

The two rotation detection pins and Ground were laid outwards.