reset your ink cartridge. Another Pinner: "Ink Cartridge Low? Not true. this totally works, my printer stopped printing, saying there was no ink, I reset the cartridge and then printed 50 more documents and the ink still hasn't run out!
Adafruit’s Secret Knock Activated Drawer Lock is designed to conceal traditional lock mechanisms – unlocking only when a secret pattern of knocks is detected. Essentially, a solenoid locks secures the drawer while a piezo buzzer “listens” for knocks.
Building "the Magic Mirror" with a raspberry pi! Read the full story: Part I - The Idea- The Mirror Part II - The Monitor Part III - The Casing Part IV - Install The Hardware Part V - Installing the Raspberry Pi Part VI - Production of the Interface