A Minimal USB CDC ACM aka Virtual Serial Port Firmware for PIC18F4550

May 29th, 2013 by Miguel Ferreira | In: Electronics, PIC

A Minimal USB CDC ACM aka Virtual Serial Port

Firmware for PIC18F4550

READ -> http://www.sparetimelabs.com/usbcdcacm/usbcdcacm.php

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Power supply – LM317

May 24th, 2012 by Miguel Ferreira | In: Electronics

I received a contact of a player because of the lack of schema source/charger, so I decided to write a little…

The basic scheme is as follows:


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USBasp ISP with ATmega8

April 27th, 2012 by Fábio Souza | In: Arduino, ATMEGA, ATMEL, Electronics

The circuit is a homemade ISP using an ATmega8 with USB communication and software that allows to program AVR microcontrollers more (ATmega, ATiny) to be used as Arduino, an eco-mode.

It is good to always have a backup scheduler as plan B

The schematic and firmware can be observed here. Below are pictures of the experience.

USBasp on white card test

And here's a reading to an Arduino with an ATmega 328:

Fuse read Arduino

ATMEGA328 … parte 2

March 29th, 2012 by Miguel Ferreira | In: ATMEGA, ATMEL, Blog, Electronics

Today I decided I had time, and after reading something more (http://mightyohm.com/blog/products/hv-rescue-shield-2-x/) did on Board of experiences to see if my beautiful atmega was returning to hear me….

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Atmega 328P-PU – DEAF!

March 28th, 2012 by Miguel Ferreira | In: Arduino, Arduino, ATMEGA, ATMEL, Programming

Gave me the ' spoil’ an ATMEGA328P-PU for having cheated on ' fuses '… But there is a remedy :)


True low cost arduino

February 19th, 2012 by Miguel Ferreira | In: Arduino

With half a dozen euros is an arduino, stable and functional.
Bill of material:
– 1 ATMEGA328p
– 1 16 MHz Xtal
– 1 USB2Serie
Some hard wire
A white card and everything is experiences :)
Didn't have the exact value of account that this cost me, but plan to add these pieces all as a kit to sell, the low-cost course.

Soon I'll post more about this topic.

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In Barometric Sensor Ethershield

February 13th, 2012 by Fábio Souza | In: Arduino, Arduino, ATMEGA, ATMEL, Electronics, Intranet and Internet, Programming

This is a preliminary test of a barometric sensor connected to an Arduino board with homemade ENC28j60, that allows you to read the atmospheric pressure in real time using I2C in PA (Pascal) from the point where. It also makes reading of temperature. Is a strong candidate to get in several projects intended for meteorology home.

With Ethershield barometric sensor


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Source/battery charger for 12V 12A (16The peak)

December 16th, 2011 by Miguel Ferreira | In: Home, Electronics, projects

Simple charger and power supply… The circuit is based on LM317 as voltage source (adjustable to a fine-tuning of load voltage)


Nokia LCD 3510 Interface with PIC18F

October 3rd, 2011 by Fábio Souza | In: Arduino, Electronics, PIC, Programming

When a mobile phone crashes in terms of software and even some hardware There are parts that can be used for experiments or for projects, in particular the LCD's, saving yourself some money.

The aim is to use an LCD from a Nokia 3510 connected to a microcontroller for information visualization, as done in previous experience, in a Nokia LCD 1100.

It is assumed that this controller is prepared both for the LCD 3510 ( screen with shades of gray), as well as the 3510i (the colors), According to this site.

Look for the welds made in contacts. It is a meticulous and work something that quite calm, as well as a low-power iron (14W) so as not to damage the contacts and the plastic membrane.


LCD flat cable soldier



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My Homemade Arduino

September 16th, 2011 by Miguel Ferreira | In: Arduino, ATMEGA, ATMEL, Blog

As my old arduino was sold (for wine or for something useful), I decided to do a 100% compatible but without the bugs that I had…


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