Embedded Lab | Embedded Systems tutorials, projects, and more …

Musical holiday card with a CD case

Posted on January 8, 2015 by R-B One comment

Dmitry Griberg’s musical holiday card project is really cool and plays a full song in full fidelity from an SD card. The project uses Attiny85 microcontroller and a 4-MOSFET amplifier circuit, both powered from a LiPo battery. The complete circuit is enclosed inside a CD case, and a simple flexible metal strip is used to make a contact sensor that will activate the player when the CD case is opened. The songs are saved on the SD card as WAV files with 32KHz sampling rate and 8-bit samples. Here is a demo video of this:

ESP8266 module and breadboard adapter kit

Posted on January 8, 2015 by R-B 2 comments

Elecrow is now offering the popular ESP-01 Serial-to-WiFi transceiver module along with our breadboard adapter kit for simplifying the prototyping of the ESP8266-based IoT applications. While you can buy the breadboard kit alone from our Tindie Store, we don’t ship it worldwide. Elecrow offers worldwide shipping at reasonably lower shipping costs. ESP8266 is an inexpensive serial-to-wifi tranceiver chip that allows to connect any microcontroller with a serial port to a WiFi network. Because of its simplicity and low cost, it is getting popular among hobbyists for building Internet of Things (IoT) applications. While there are varieties of breakout boards available

Portable multifunctional tool with Nokia 3310 casing

Posted on January 7, 2015 by R-B Leave a comment

Mastro Gippo’s 1337 3310 multifunctional portable tool is hacker’s Swiss knife in the shell of Nokia’s most durable and iconic 3310 phone and is also the winner of Hackaday’s Trinket Everyday Carry Contest. It features ohmmeter, graphing multimeter with simultaneous measurements of current and voltage, as well as instantaneous and average power consumption measurements that help to estimate the battery life of your prototypic design. He also maintained the original look and feel of Nokia 3310 by developing the similar user interface for his tool. The continuity tester feature plays the original Nokia tune as output.

Shower room door sensor

Posted on January 4, 2015 by R-B Leave a comment

James and his other colleagues often bike to work to stay healthy. The problem is their work place has only one shower stall. So he built this shower room door sensor to provide an at-desk indication of whether the shower room is free or occupied so that he doesn’t have to run to the bathroom to check its status. While there are other similar projects done before, this has a distinguishing feature that it detects the bolt of the door lock, and therefore it is more reliable than just sensing if the door is shut. He used some paper-clips and post-it

Using BMP180 for temperature, pressure and altitude measurements

Posted on January 1, 2015 by R-B 9 comments

The BMP180 is a new generation digital barometric pressure and temperature sensor from Bosch Sensortec. In this tutorial, we will briefly review this device and describe how to interface it with an Arduino Uno board for measuring the surrounding temperature and pressure. We will also discuss about retrieving the sensor altitude from its pressure readings.

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