Blogs

To Boldly Go...

Tue, 12/02/2008 - 11:07 — feurig

I finally got a chance to wire up the first of my ATMega32U4 samples (see atmel doc7766). Like all of atmel's usb chips it comes up as a bootloader. Now we get to go through the list of things that are probably broken (starting with dfu-programmer which I already know from fixing it for the at90usb647 is broken).

dfu-programmer

Success at Etching!

Mon, 11/24/2008 - 06:37 — Laen

It tooks some tries, but I think I'm doing pretty well at etching now.

Focused Workshop, 30Nov08, Making Noise with the Arduino.

Wed, 11/19/2008 - 18:55 — feurig

As a part of the ongoing Arduino Cult Induction workshop series, this month we will be focusing on sound.

In particular I will be going over creating sound using the Arduino's built in Pulse Width Modulation (PWM) and Direct Digital Synthesis using resistive ladders. We will investigate using the Piezo element as both a simple speaker and an input trigger. We will review the Musical Instrument Digital Interface (MIDI) from a hardware and software perspective, and look at a couple of useful integrated

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Build Your own open source usb/midi gateway

Sun, 11/16/2008 - 00:25 — feurig

I am trying to digest this document.

http://www.usb.org/developers/devclass_docs/midi10.pdf

USB encapsulates midi data into 4 byte chunks and adds the notion of virtual cables.
The first byte in the packet is the cable number and something called the Code Index Number. The remaining 3 bytes are either midi or padding depending on the packet.

Most of the relevant midi status commands have a corresponding Code Index Number.

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All Hail the blinkin lights!

Thu, 11/13/2008 - 21:23 — feurig

Wanna dorkboard but afraid of surface mount?

Brian Riley at Wulfden will sell you a stripped down dorkboard kit with the reset pullup resister and the programming jumper ALREADY SOLDERED! and for another 6 bucks you can build a nifty flashlight!

http://www.1strecon.org/TheShoppe/flashlight/index.shtml

Schematic for the flashlight kit.

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Single Sided PCBs

Thu, 11/13/2008 - 02:09 — Laen

In preparation for making PCBs, I've created some little one-sided PCBs in Eagle.

They are:

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Speed Control Circuit and Hbridge ?

Wed, 11/12/2008 - 22:27 — msoto

I am fairly new to robotics/autonomous vehicles. I have a quick question; maybe someone can answer for me. I have a little Hot Wheels RC car that I had gutted all the rc components off of; I am wanting to attach my dorkboard and control the speed and direction of the motors. I have a circuit design to produce a motor controller (H Bridge)( http://itp.nyu.edu/physcomp/Labs/DCMotorControl ), but I would like to control the speed of the motors (14mph is too fast). How will I combine motor and speed control in one circuit and then use the dorkboard to control them?