Automatic greenhouse door opener Goal Opening the greenhouse door automatically when the room gets too hot. I have set it to 24 degrees C that the door opens and door gets to maximum position when there is 32 degrees C. Used hardware In box Arduino Nano clone - main "brain" of the project 5110 LCD - LCD to show info DS18B20 - temperature sensor SRD-05VDC-SL-C - 2 relays LEDs x 6 - for indicators Resistors Capacitors - 3x Level shifter 5V->3.3V 7805LM - 12v to 5v 10A fuse and fuse pcb mounts PCB screw terminals On door Car side window lifting motor and mechanism Magnet and PS-3150 Reed Switch Switch - for door "homing" bolts, nuts, threaded bar Software I wrote code for the arduino to control the door. Arduino checks if the home swich is pressed. When home switch is not pressed the arduino tries to close the door. When door is closed now the arduino knows the "0" place. Measuing temperature. When temp is <24C then does not