Category Archives: Ideas

Digispark bike speedometer

July 26, 2013

Lately I’ve been thinking about doing an Arduino or similar based project.  I heard about the Digispark (which is basically a mini Arduino) from AwkwardEngineer.com and was intreagued.  I’m thinking of using a Digispark to drive a I2C 4×7 segment … Continue reading →

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Updated LM317 fan controller

May 29, 2012
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12v Fan Controller v1.2

May 23, 2012
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New 12v Fan Controller

May 18, 2012

This is my latest fan controller, based off a LM317 regulator.  It can be adjusted from fan turn on at 64F and max speed at 131F up to turn on at 104F and max speed at 167F.

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Fan Controller

May 17, 2012

This is a fan controller I worked on, based on the Temperature Controlled Fan I found online. In this version, R1 is a 10K NTC thermistor (shown in schematic at 20C, which is 12.5k).  Adjust R2 for the turn on … Continue reading →

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