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Posts Tagged ‘Arduino’

Evaluating SparkFuns’ Microphone Breakout Boards

February 20, 2010 1 comment

Thinking about an Arduino project using some audio I compared two breakout boards for different microphones I obtained from SparkFun. The green one uses an electret microphone and the build-in opamp a fixed gain of 100. The red one uses a MEMS microphone also found in the PSP2. It has also an opamp onboard with a fixed gain of 100. Curious which one is more sensitive and how the output looks like I connected both to two A/D from an Arduino Mini 3.3V. The small sketch found after the break just writes the values from the A/D to the serial port every 100 ┬Ás.

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Categories: Electronic Gadgets Tags:

Playing with Accelerometer and Bluetooth

January 17, 2010 2 comments

Recently I was playing a little bit with a MMA7260Q triple axis accelerometer from Sparkfun. The brain is provided by an Arduino Pro Mini running at 3.3V. The talking is done by a bluetooth radio also obtained for hard money from the great folks of Sparkfun. The whole thing is easily assembled on a bread board and just worked right away. Behind the break you can find the code as well as an output log.

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Vibrator Controller

December 29, 2009 6 comments

This is a simple Arduino Diecimilia based controller for a vibrator I build some time ago. The vibrator doesn’t life any more. It destructed itself within minutes due to the strong vibrations (R.I.P). It drives a 12V (or any other voltage between 6V to 20V) electro motor with pulse width modulation (PWM). Further it offers a couple of other options:

  1. PC-Mode: Lets the PC control the vibrator over USB. Also lets you store some custom wavetables in the EEPROM
  2. Const: Just controls the speed.
  3. Ramp: Ramps the speed to the set value. Very much like a saw-tooth.
  4. Throb: Increases and decreases the speed.
  5. Wavetable 1
  6. Wavetable 2
  7. Wavetable 3
  8. Wavetable 4
  9. Wavetable 5

The first knob lets you choose the program, the second knob controls the speed (except in PC-Mode) and the third knob controls the time from one step to the next.

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Categories: DIY Playthings Tags: ,
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