LED matrix displays are great fun. They are visually charming, and readable from a far viewing distance with a much wider angle of view as compared to many other types of electronics displays. They can display all kinds of information, including text, graphics, and animation. This project is about making a portable Bluetooth-controlled 8×64 monochromatic LED matrix (total 512 LEDs) for displaying scrolling text message. I made this display to use at home parties or other occasions for displaying greeting messages. The text data to be displayed can be sent from a smartphone using the Bluetooth connection. The display is Arduino-controlled and uses the HC-06 Slave Bluetooth transceiver module for receiving data from the smartphone. I am also using the Bluetooth SPP Pro (freely downloadable) App (developed by Jerry.Li) on my HTC One Android smartphone for sending text message to the matrix display. The complete project has got a nice enclosure made by myself using furring strip boards bought from the Home Depot. We looked at a similar project earlier made by Jollyfactory, who used bi-color LED matrices, which required two MAX7219 devices per 8×8 matrix.
Tag Archives: arduino
Here is an instructable that describes a DIY shield which would convert your Arduino board into a multifunctional digital multimeter. This shield can be used with “Arduino” UNO und Duemilanove boards, and can display the measurements on a 16X2 character LCD and/or on the serial monitor window on PC. This digital multimeter Arduino shield has the following features:
- voltmeter ranges : 0-10V; 0-30V; 0-100V
- ampmeter range : 0-500mA
- ohmmeter ranges : 0-1KOhm, 0-250KOhm
- diode, LED, continuity tester
- LED functionality tester
- transistor Beta meter
This Arduino-powered vocal effects generator box shifts and distorts incoming audio signals to produce a wide variety of vocal effects. It samples an incoming audio signal from a microphone at 40KHz sampling rate, digitally process the audio, and finally outputs it as an 8-bit audio at 40KHz.
Step-by-step guide for making a very simple temperature and humidity meter with 7-segment LED displays
In this blog post, I am providing you step by step instructions to build a very simple temperature and relative humidity meter for indoor use. All you need to build this project are an Arduino Uno or compatible board, a DHT11 sensor, and a MAX7219 based 8-digit serial 7-segment LED display. The temperature is displayed in degree Celsius and relative humidity in percentage.
The Si7005 temperature and relative humidity sensor breakout boards are back in stock at Tindie. The Si7005 integrates fully factory-calibrated humidity and temperature sensor elements with an analog to digital converter, signal processing and an I2C host interface in a single monolithic CMOS sensor IC.
- Precise temperature and relative humidity measurements
- Standard I2C communication
- 0-100% RH range
- Excellent sensor stability