Posts tagged Arduino LED
Arduino Breathing LED Functions
Arduino Breathing LED Functions

In this tutorial - an Arduino board will be used in conjunction with an RGB LED to investigate several ways of replicating the breathing LED effect. Using the equation for a triangular wave, circular wave, and Gaussian wave, a breathing LED will be constructed. The amount of code needed for the simplest breathing LED is as little as two lines of code, while the more complex breathing functions grow in difficulty from there.

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Arduino, ElectronicsJoshua HriskoArduino, LED, RGB LED, Breathing LED, Arduino Code, Arduino LED, Arduino Project, Arduino RGB LED, Arduino RGB, Gaussian, Circle, Triangle, Wave, Brightness, Arduino Uno, Tutorial, Demonstration, ProgrammingComment
Controlling Arduino Pins from the Serial Monitor
Controlling Arduino Pins from the Serial Monitor

In this tutorial, another method of control is introduced that involves manual control using input from the serial monitor. This means each pin can be turned on or off using the human input to the serial monitor. An RGB LED is used to demonstrate the capability of serial monitor control, where each color of the LED is controlled individually using dedicated Arduino pins.

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Electronics, Arduino, ProgrammingJoshua HriskoArduino, RGB, RGB LED, Arduino RGB, Arduino RGB LED, LED, LEDs, Serial, Serial Port, Serial Monitor, Arduino Serial, Arduino pins, Arduino Control, Input, Arduino LEDComment
WeMos D1 Mini ESP8266 Arduino WiFi Board
WeMos D1 Mini ESP8266 Arduino WiFi Board

The WeMos D1 Mini is an inexpensive ESP8266-based WiFi board that is low-profile but just as powerful as any NodeMCU or ESP8266-based microcontroller. The D1 Mini is incredibly versatile because it is inexpensive, WiFi-enabled, and fully compatible with the Arduino platform. In this tutorial, the ESP8266 library and board manager will be introduced in order to get the D1 Mini acting as an Arduino board. Then, a simple web page will be introduced with the intention of harnessing the WiFi capabilities of the module. The D1 Mini will act as a web server, allowing any WiFi-connected device to interact with the board and control its pins wirelessly.

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Arduino, Electronics, ProgrammingJoshua HriskoArduino, D1 Mini, Arduino ESP8266, ESP8266 WiFi, ESP8266 Server, ESP8266, WiFi, WiFi Project, WiFi Module, Arduino WiFi, Arduino IoT, Arduino WiFi Server, Arduino Server, D1 Mini Arduino, D1 Mini ESP8266, ESP8266 D1 Mini, WeMos, WeMos D1 Mini, WeMos ESP8266, WeMos WiFi, Server, Web Server, Arduino Web Server, Arduino Boards Manager, Arduino LEDComment
Arduino Optical Fingerprint Sensor (AS608)
Arduino Optical Fingerprint Sensor (AS608)

Optical fingerprint sensors take low-resolution snapshots of the tip of a finger and create arrays of identifiers that are then used to uniquely identify a given fingerprint. The AS608 is capable of storing up to 128 individual fingerprints. This tutorial will introduce the AS608 Arduino-compatible fingerprint sensor and how to validate and reject fingerprints based on the enrolled fingerprint information that will be given to the sensor. The fingerprint algorithm is handled by the AS608 and Arduino, so this tutorial will focus on implementation and putting the pieces together to make a working fingerprint sensor with Arduino.

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Arduino, ElectronicsJoshua HriskoFingerprint, Fingerprint Module, Fingerprint Arduino, Arduino, Arduino Sensor, Arduino Fingerprint, Arduino Module, Arduino LED, Arduino Resistor, AS608, Fingerprint Identification, Arduino Finger, Arduino Fingerprint Identification, Adafruit, Adafruit Fingerprint, Arduino Board, Arduino Uno, Breadboard, LED, LEDs, Sensor, Library, Enroll, Fingerprint IDComment
Arduino Interrupts with PIR Motion Sensor
Arduino Interrupts with PIR Motion Sensor

The basics of Arduino’s hardware interrupt is explored through the use of a passive infrared (PIR) sensor. The passive infrared sensors used here operate at voltages from 2.7V - 5V and use very little energy when operating in the non-tripped state. The PIR sensor is ultimately tripped by an infrared source, typically human body heat (or another animal with similar radiative emission). When the PIR sensor is tripped it sends a HIGH signal to its OUT pin, which will be read by the Arduino’s interrupt pin (pin 2 or 3 on the Uno board). This process seems trivial, but when done correctly can save massive amounts of energy when dealing with battery-powered systems, as in home automation.

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Arduino, ElectronicsJoshua HriskoPIR, passive, passive infrared, PIR sensor, Sensor, IR Sensor, Infrared, LED, Arduino, Arduino IoT, Arduino LED, Arduino PIR, Arduino Sensor, Arduino Interrupt, Interrupt, Arduino IDE, Resistor, Arduino Uno, Arduino Low Power, Low Power, Arduino LowPower, Arduino Wiring, VCC, ATmega, ATmega328, ATmega328P, Power Consumption, Arduino Power Consumption, Arduino Power, RISING, FALLING, CHANGE, attachInterrupt, Arduino attachInterrupt Comments
Controlling LEDs with A Multiplexer and Arduino
Controlling LEDs with A Multiplexer and Arduino

A demultiplexer will be used to control 8 LEDs using just 3 digital pins on the Arduino board. This method of demultiplexing frees up pins on the Arduino, but also makes control of multiple LEDs easier by consolidating the power given to each LED. This will allow us to use LEDs without resistors. In general, a demultiplexer uses N boolean outputs to control 2N switches. In our case, the CD4051 multiplexer will be used as a demultiplexer using 3 digital pins and boolean logic to control 8 individual LEDs. Several skills will also be developed, specifically with regard to programming in the Arduino programming language. Pulse-width modulation (or brightening and dimming) of LEDs will be explored, as well as randomization of LED blinks, along with the general selection process for boolean switching with the demultiplexer.

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Arduino, Electronics, ProgrammingJoshua HriskoLED, LEDs, Breadboard, Arduino, Arduino LED, Arduino LEDs, Arduino Uno, Arduino CH340, Arduino Multiplexer, Arduino Demultiplexer, Arduino Multiplexing, Arduino LED Multiplexing, Arduino LED Multiple, LED Array, Random, Arduino Random, Arduino Blink, Arduino PWM, PWM, Pulse-Width Modulation, Blink, BooleanComment
Capacitive Touch Sensor with Arduino
Capacitive Touch Sensor with Arduino

Capacitive sensing from human touch. Create a switch without any moving parts with an Arduino board and an inexpensive capacitive touch sensor.

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Arduino, ElectronicsJoshua HriskoCapacitive Touch, Capacitive, Arduino Capacitive Touch, Arduino Experiment, Arduino IDE, Arduino Sensor, Arduino Capacitive, Arduino Capacitive Sensor, Arduino Touch Sensor, Arduino Touch, Arduino Project, Arduino Uno, Arduino Wiring, Analog, Analog Read, Arduino Serial, Arduino Digital, Arduino Digital Write, Arduino LED, ENGR101, Capacitive Touch Sensor, Arduino Tutorial, Arduino Touch Tutorial, Arduino Capacitive Tutorial, Capacitive Touch Tutorial, Capacitive Arduino, Capacitive Touch Arduino, Sensor Comments