Category: Twin LEDs

You can build an interactive toy that responds to changing light levels by removing the 10KΩ potentiometer and adding a photocell wired to a 1KΩ resistor of the Adjustable Twin LED Flasher. Wiring a photocell to a 1KΩ resistor allows the Arduino to read light levels applied to pin A0. Figure 4-10 and Figure 4-11 show the Fritzing and circuit schematic diagrams…

To make the Adjustable Twin LED Flasher, simply add a 10K ohm potentiometer to the device. The flash rate can be adjusted to make the on/off toggling slower or faster. The Fritzing diagram in Figure 4-7 along with the circuit schematic diagram shown in Figure 4-8 will allow you to build the Adjustable Twin LED Flasher. The MakerShield Adjustable Twin LED Flasher is…

The circuit theory diagram shown in Figure 4-3 can easily be converted into a cool electronic gadget. You can build a Twin LED Flasher using an Arduino, two 330 ohm resistors, and LEDs, as shown in Figure 4-4. The Twin LED Flasher circuit schematic diagram is shown in Figure 4-5. To make the flasher device compact, you can build it on the MakerShield,…

An LED is an electronic part that emits light when properly wired in an electric circuit. The LED has positive and negative leads protruding through a plastic body, as shown in Figure 4-1. You can use the Arduino in electronic projects to operate multiple LEDs. Figure 4-3 shows two LEDs wired to the Arduino D13 pin. The Arduino output pins…

Figure 4-1. Variety of LEDs Figure 4-2. Twin LEDs block diagram

LEDs in Parallel LEDs can be used to light objects or to alert the user about the operating conditions of a device. Light-emitting diodes are easy to use and they come in a variety of shapes, sizes, and colors, as shown in Figure 4-1. The Arduino has a dedicated tiny LED wired to pin D13. By uploading the…