ATmega328

4CHord MIDI

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From Sven Gregori on Hackaday.io:

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4chord MIDI
the USB MIDI keyboard dedicated to play all the four chord songs, from Adele via Green Day and Red Hot Chilli Peppers to U2 and Weezer. Thanks to MIDI, you can be any instrument – and all of them at once. Yay!
 Built around an AVR ATmega328 and Objective Development’s V-USB library, 4chord MIDI acts as a regular USB MIDI instrument. It supports playback in every key and five different playback modes:
  • simple triad chord (root, third, fifth)
  • triad chord + third + fifth + third as quarter notes
  • triad chord + third + fifth + octave as quarter notes
  • root note + third + fifth + third as quarter notes
  • root note + third + fifth + octave as quarter notes

The playback tempo can be set between 60 and 240 bpm.

Here is the board in action:

The design files and source code are available on GitHub:

sgreg/4chord-midi

4CHord MIDI

Low power Arduino Pro Mini board

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3317771479151537261.JPGMax.K created this Arduino Pro Mini compatible development board for low power applications:

LP Mini

ideal for data logging over extended periods of time [..] can run for months or even years on a coin cell

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Hardware

  • Microcontroller: Atmega328p with Arduino bootloader
  • Real Time Clock: MCP79410
  • Voltage Regulator: MCP1700
  • FDN340P MOSFET

Features

  • 2.8 µA current consumption in sleep mode
  • Compatible to the Arduino Pro Mini (except for pin 2 and 10)
  • A real time clock keeps the time and is used to wake the Atmega from sleep mode
  • Sleep current is reduced by using a more efficient voltage regulator
  • A simple Mosfet is used to turn external devices on and off if the IO pins cannot provide enough current
Low power Arduino Pro Mini board

Building an ATmega328 uploader

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Carlos of GlowSaber wrote a great blog post on how we built an AVR programmer shield:

Building an ATmega328 uploader

As I learned more about Arduino, I realized that it is possible to redesign the GlowSaber around the ATmega328 chip [..] I designed an Arduino Shield that can be used to burn the bootloader and upload programs to an ATmega328 chip.

http://www.glowsaberphysics.com/?p=171
http://www.glowsaberphysics.com/?p=171
http://www.glowsaberphysics.com/?p=171
http://www.glowsaberphysics.com/?p=171
http://www.glowsaberphysics.com/?p=171
http://www.glowsaberphysics.com/?p=171
http://www.glowsaberphysics.com/?p=171

Here’s a example of an ATmega328 in a custom board:

cvadillo shared the board on OSH Park:

Arduino ISP Breakout shared project

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Order from OSH Park

Building an ATmega328 uploader

Arduino Pro Trinket Bubble Display

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davedarko wrote in his LED displays on Arduinos – a collection project log on hackaday.io:

Arduino Pro Trinket – bubble display

With 4 of HP QDSP-6064 bubble displays in a drawer I felt ready to do something with them and the “Clocks for Social Good” – call on hackaday.com finally got me going

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The design files are available on GitHub:

images TrinketProShield_display

davedarko has shared the board on OSH Park:

ProTrinket Bubble Display shield

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Order from OSH Park

Arduino Pro Trinket Bubble Display