Focuswriter raspberry pi
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Our release button forthe door is also on this circuit.We connect a relay board tothe Pi, providing it with 5V and GND, and then connectGPIO17 of our Pi to IN1 on the relay board.This enables the Pito trigger the relay and remain isolated from the 12V circuit.The 12V circuit to the relay is the 12V+ power from a 12VDC supply.This is connected to the COM terminal, the centreterminal.And a connection is made from the NC (normallyclosed) terminal to the magnetic door lock.The 12V GNDconnection is made from the DC power supply to the GND ofthe magnetic lock. There are two parts to this project: the low-voltage circuit forthe Raspberry Pi, and the higher-voltage 12V circuit for themagnetic door lock.The Pi is connected to the RFID readerusing the SPI interface on the GPIO. Or this month’s project we shall build our own doorsecurity system, which can be used to log who entersa property using inexpensive RFID (radio frequencyidentification) cards.These RFID cards are read using an RFIDreader – the RFID-RC522 – which gives a unique ID for eachcard.This is checked against a dictionary of accepted cards,and if found a relay is triggered, disconnecting a 12V circuitused to power the magnetic lock.Watch your fingers, though:the magnet is strong and can supply 280kg of force!
#Focuswriter raspberry pi how to
RFID: ContrNight watchman Les Pounder shows us how to makesystem using a Raspberry Pi, a magnetic lock and an R Les Pounder takes a look at a new board that offers a bu
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Sean Finney on using Linux in engineering