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Category: Arduino Projects

  • Let’s Build a Sunrise-Sunset Light Switch

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    by

    haroonkhan
    in

    You can build a Sunrise-Sunset Light Switch by modifying the Trick Switch device. The main change you will make is to remove the mini pushbutton and replace it with a photocell. You will also add a green LED to pin D13 of the Arduino. Refer to the Parts List for all the electronic parts required for…

  • Parts List

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    haroonkhan
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    Figure 2-1. Sunrise-Sunset Light Switch circuit built on a full-size clear breadboard (the 100 uF electrolytic capacitor and the red and green LED negative pins are wired to ground)

  • Introduction

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    haroonkhan
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    Resistor-Capacitor Timing Basics Designing and building new electronic devices is quite easy when you know the secret ingredient to rapid design. The technique is to take an existing electronic device and make a small change to it. For example, the Trick Switch project can easily be changed to a noncontact device by adding a sensor. With…

  • Something to Think About

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    haroonkhan
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    Try different resistor and capacitor values and see what happens. Can you detect any patterns? How can a small piezo buzzer be used with the Trick Switch? Figure 1-5. Trick Switch circuit schematic.

  • Trick Switch with On/Off Indicators

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    haroonkhan
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    In developing new products, electronics designers are always improving designs by adding features and functions that excite the customer. The Trick Switch device you built can be improved by adding an LED indicator. This LED indicates when the Trick Switch timing cycle is done. Figure 1-3 shows you where to add a green LED to the Trick Switch on…

  • Let’s Build a Trick Switch

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    by

    haroonkhan
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    When you press the pushbutton switch on this device, the LED turns on. The capacitor will begin storing electrical energy from the +5VDC power supply circuit of the Arduino. Releasing the pushbutton switch cuts off the flow of electricity from the source, but the energy stored in the capacitor keeps the Arduino running for a…

  • Parts List

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    haroonkhan
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    TECH NOTE You can create your own electrical circuits and test them using diagrams with an online simulator called Circuit Lab.

  • Introduction

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    by

    haroonkhan
    in

    Resistor-Capacitor Timing Basics In electronics, sometimes we want to keep a device on for a certain amount of time even when an electrical switch is turned off. Ordinary pushbuttons used to turn electronic devices on and off can easily be operated by a timed delay switch. How awesome would it be to create such a device…