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Application of ambient light sensors (ALS) in portable electronics

Posted on July 23, 2013 by R-B Leave a comment

ROHM Semiconductors presents this white paper on the Applications of Ambient Light sensors in Portable Electronics. In portable electronic products, reducing the power consumption to provide the user with increased battery life is one of today’s critical design considerations. The liquid crystal display (LCD) and its associated backlighting are among the more (and frequently the most) power hungry loads in portable products. As a result, the use of an ambient light sensor (ALS) to optimize the operation of the backlight LEDs under a variety of environmental lighting situations is increasing while, at the same time, the preferred technology choices available

mbed powered automated Sun tracker

Posted on July 22, 2013 by R-B One comment

Maximizing power output from a solar system is desirable to increase efficiency. One way of maximizing power output is by keeping the solar panels always aligned with the sun. This requires a means of tracking the sun. Here is an mbed powered solar tracker that continuously keeps track of the sun and points the solar panels directly towards the sun all the time. The project uses two smaller solar cells (besides the large solar pannels) placed right angle to each other. The alignment of the big solar panels and smaller solar cells is such that when the solar panels are directly facing

Arduino clock with MP3 alarm

Posted on July 18, 2013 by R-B Leave a comment

Here’s a very nice digital alarm clock using Arduino and VS1053 MP3 decoder board. VS1053b is a single-chip MP3/AAC/-WMA/MIDI audio decoder that contains a high-performance, proprietary low-power DSP processor core VS DSP4, working data memory, 16 KB instruction RAM and 0.5+ KB data RAM for user applications running simultaneously with any built-in decoder, serial control and input data interfaces, upto 8 general purpose I/O pins, an UART, as well as a high-quality variable-samplerate stereo ADC (mic, line, line + mic or 2×line) and stereo DAC, followed by an earphone ampli?er and a common voltage buffer. This project uses 128×64 GLCD

DIY FM transmission station using Arduino

Posted on July 16, 2013 by R-B One comment

This project describes an Arduino-based FM transmission using the KT0803K Digital Stereo FM Transmitter Radio-Station-on-a-Chip. The KT0803K device is designed to process high fidelity stereo audio signal and transmit modulated FM signal over a short range. It features an on-board 20-bit audio ADC and supports standard I2C interface for frequency setting and power control. The project uses the Nokia 5110 GLCD for display and a potentiometer for varying the frequency of FM transmission.

Two way Bluetooth between Arduino and Android

Posted on July 7, 2013 by R-B Leave a comment

This instructable describes an Android application named Andruino that can be used to control an Arduino board from an Android phone. It’s both an Android app and an Arduino program, and provides a simple user interface to control Arduino’s digital and PWM, send text commands to Arduino, and receive data from Arduino over Bluetooth serial using the popular and inexpensive HC-05 Bluetooth serial module.

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