ARDUINO TUTORIAL 04: Relays (Control 120V – 12V Devices )

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Arduino Tutorial

In this exciting episode we continue to explore the possibilities of the Arduino Prototyping Platform. This episode features an in depth tutorial on how to incorporate Relys into your arduino project.

By the end of this episode you will be a relay pro!

Parts Needed:

• ARDUINO UNO
• RELAY
– https://www.sparkfun.com/products/100
• 20 JUMPER WIRES
• BREADBOARD
• 330 Ohm RESISTOR
• NPN 2N222 TRANSISTOR
– http://www.radioshack.com/product/index.jsp?productId=2062586
• DIODE 1N4007 RECTIFIER – 1A 50V
– https://www.sparkfun.com/products/8589

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Duration : 0:9:23


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13 thoughts on “ARDUINO TUTORIAL 04: Relays (Control 120V – 12V Devices )

  1. great video, I got …
    great video, I got a raspberry pi but? I’m interested in buying an Arduino Uno to expand my home projects capabilities. Your videos help a lot for a beginner like me, thanks!

  2. Vadet? Kalisi: The …
    Vadet? Kalisi: The transistor is needed because the arduino cannot supply enough current to switch the relay. About PWM I am not sure but I suppose it is possible.

  3. Ok my question is …
    Ok my question is why u r using transistor and relay same time? one? of them isnt enough? and the second question about pwm? can u use pwm signal when u r usng relay?

  4. Thanks Ronn for …
    Thanks Ronn for providing suggestions on how to improuve! I have? also been looking into using transistors instead of diodes.

  5. Roman, well done.

    Roman, well done.
    A few thoughts:
    Polarity is important on the diode. This diode will reduce inductive kickback from the coil. A resistor or zener diode can be placed in series with the flyback diode to use up the stored energy? quicker.
    Great job!
    -Ronn

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