Output Relay, Optoisolator, and Stepper motor interfacing with AVR

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Presentation transcript:

Output Relay, Optoisolator, and Stepper motor interfacing with AVR Sepehr Naimi www.NicerLand.com

Topics AVR Fan-out Transistor ULN2003 Relay Opto-isolator Stepper motor

AVR Fan-out Each I/O port can sink 20 mA at VCC = 5V and 10 mA at VCC = 3V

Transistor We can switch devices using transistors. Transistor amplifies signals. VCC AVR Load

ULN2003 There are 7 Darlington transistors in a ULN2003.

Relay Relay is an electronic controlled switch. It isolates two parts of a circuit from each other. A small amount of current and voltage causes to switch a large amount of voltage and current. Relay DPDT Maximum output: 250V 8A ~AC Input: 24V DC

Relay parts Relay has the following parts: Coil Contacts Spring

Contacts SPST SPDT DPDT

Relay ~ + - 220V 12V

AVR connection to relay Micro Darlington Relay Lamp

Optoisolator Opto-isolator isolates two parts of a circuit from each other. There is an LED in the input, and a photo-transistor in the output. When the LED lights up, the photo-transistor, senses the light and becomes conductor, and passes the current. can be used in input or output circuits. TLP521

Opto-isolator TLP521 16mA 10mA

Controlling 220V devices ~ AVR Digital Power Analog Power +12V Analog Ground Digital Power 220V ~ ULN2003 Analog Power in out +5V Digital Ground

Stepper motor Stepper motor is a motor, whose rotation angle is proportional to its input pulse. Rotor A tooth N S COM B Stator C COM D

Stepper motor rotation B N S +5V S N S N D S N C +5V A

Stepping N S B N S +5V S N S N D S N C +5V A

Half stepping N S B N S +5V S N S N D S N C +5V A

RPM * Steps per revolution Calculations N S B S N +5V S N N S D S N Step angle = 90 Num of teeth A +5V C Steps per revolution = 360 Step angle = 4 * Num of teeth Steps per second = RPM * Steps per revolution 60

AVR and a Stepper motor