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Cooking GNUduino

Published on: October 09, 2010

Today I fabricated the PCB for GNUduino (Arduino made with gEDA). I used screen printing to transfer the PCB layout. Screen printing is another way to transfer the PCB layout to the copper clad instead of the conventional toner transfer method. Download GNUduino  design files

The PCB was successfully fabricated and also tested the LED blink sketch. Everything is working fine.

NOTE: The below shown are only prototype’s to verify the design. High quality PCB’s cab be made with the design files.

Here are some snapshots

The screen printed copper clad’s

screen printed copper clad's of GNUduino

Etching the PCB

Etching GNUduino

After drilling holes

Drill holes in GNUduino

GNUduino is ready

GNUduino - Arduino made with gEDA

GNUduino – Arduino made with gEDA

Published on: October 08, 2010

GNUduino is an Arduino board (Arduino Single-Sided Serial Board Version 3) redrawn using gEDA. GNUduino functions same as that of an Arduino board (It’s just a clone of Arduino ).

When I saw the existing Arduino boards, I felt there is still a freedom missing. The existing Arduino boards are designed using a proprietary CAD tool. But GNUduino is free from those. It is designed using a complete free Schematic and PCB CAD tool named gEDA. This is my first Open Hardware project.

I would like to say special thanks to Pramode Sir for suggesting this name for the board.

You can download the schematic and PCB layout files from the below link

Update: Cooking GNUduino

USB mp3 player connection diagram

Published on: October 08, 2010

Update: At present I don’t have the SD card connector circuit diagram. Please don’t post in the comments asking for the circuit.

Long back in my blog I had posted how to make an USB mp3 player.

This mp3 player is made using a Chinese mp3 decoder board. Find more about the mp3 decoder board at

You don’t have to order it from china. It is available from most of the local electronic shops in INDIA. I don’t know about other countries.

The board is self explanatory. It has proper silk screen markings which shows how to connect. But still many had posted comments in my blog for the connection diagram of this board. I think it is hard for an electronics beginner to connect the board. So I thought of posting the connection diagram.

On the rear side of the board, there are three connectors.

They are for

1) Player buttons and IR sensor

2) USB and MMC/SD card interface

3) Power supply

For the board to play music, it needs a 5V DC power supply, USB port, 3.5mm stereo jack and an IR sensor to detect the signals from remote. You can also add switches to control songs, SD/MMC card slot, antenna for clear radio reception. All these are optional.

Connection diagram
USB MP3 connection diagram

The connection diagram doesn’t show how to connect an SD/MMC card socket. You can connect the SD/MMC to this player using an USB card reader.

Be careful while connecting the USB socket. If there is a connection mistake, it can damage your flash drive. Cross check the connection with the below image.

USB connector

Bill of Materials

MP3 Player board + Remote Controller

USB socket

3.5mm stereo jack

IR sensor (3.3v)

5V power supply

Switches (optional)

SD/MMC card socket (optional)

NOTE: This is not an open Hardware project because the circuit diagram and PCB layout is not available from the vendor :(

My tweet account

Published on: September 19, 2010

Today I was setting up my old unused Twitter account. Added all my FOSS friends.

Now you can get my tweets from

My new laptop

Published on: September 06, 2010

Lenovo G560 – My new laptop.

I got it three weeks before. It’s now powered by Ubuntu 10.04 Lucid Lynx

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