Figure 9-2 shows a typical RGB LED with the wiring pinout names. There are three pins, one for each color, and one common pin for positive attachment to a power supply. Like the ordinary LED, the positive and negative pins are wired to the positive and negative points of a DC (direct current) circuit. To illustrate, Figure 9-3 shows three SPST (single… Continue reading Circuit Theory
Category: Arduino Projects
Parts List
Figure 9-1. The RGB Flasher block diagram
Introduction
Free Running Switcher In past projects, one or two LEDs, usually red and/or green, were used as visual indicators, letting us know that the Arduino had completed a task or operation. But why limit ourselves to red and green? There is a type of LED that has three different colors all in the same package.… Continue reading Introduction
The Up-Down SensorThe Up-Down Sensor
A simple Arduino microcontroller flasher can easily be turned into an Up-Down Sensor by adding a tilt control switch. As shown in Figure 8-3, the tilt control sensor is mounted on the MakerShield. When the tilt control switch is in the horizontal position, both the red and green LEDs will flash. Placing the MakerShield on its side will… Continue reading The Up-Down SensorThe Up-Down Sensor
Circuit Theory
As shown in Figure 8-1, the LED wiring is quite different from previous projects, because an electrical ground and a +5V battery are used to individually operate them. The idea behind this wiring technique is to allow one LED to be on at all times. The circuit schematic diagram in Figure 8-2 on the left shows LED1 on while LED2 is off.… Continue reading Circuit Theory
Parts List
Figure 8-1. The Up-Down Sensor block diagram TECH NOTE A tilt control switch is sometimes called a tilt sensor.
Introduction
Up-Down Sensor The FrankenBot toy illustrated the method of flashing two LEDs wired in parallel. The Arduino microcontroller made it easy to change the flash rate of two LEDs using a 10KΩ potentiometer. How cool would it be to control an LED’s flash rate by moving an electronic box in an up-down motion? This project is a… Continue reading Introduction
Upload the Arduino OR Logic Gate Sketch
With the Arduino AND Logic Gate built on the MakerShield, it is time to upload the sketch. Example 7-1 operates the green LED using a pushbutton switch and a photocell. Here are the steps you’ll need to take: The Arduino OR Logic Gate will turn on the LED when the photocell is covered or the pushbutton switch is… Continue reading Upload the Arduino OR Logic Gate Sketch
The Arduino OR Logic Gate
You can build a digital computer OR Logic Gate circuit using the Arduino microcontroller and a few electronic components. The green LED turns on when either the pushbutton switch OR the photocell is TRUE. You can easily build the logic circuit using the Fritzing wiring diagram shown in Figure 7-6. You can build this basic digital computer circuit on… Continue reading The Arduino OR Logic Gate
Circuit Theory
The OR Logic Gate is another computer circuit providing a TRUE output based on at least one input data value having a closed state. A basic OR Logic Gate electric circuit schematic diagram is shown in Figure 7-2. The circuit schematic diagram on the left shows one pushbutton switch closed and the other one open. The output for this… Continue reading Circuit Theory