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InaMORAta: Difference between revisions
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→Control (PWM)
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We'll need a digital input pin with interrupt support. On the Arduino Uno, this restricts us to pin 2 or 3. We use pin 2, plus the necessary resistor. | We'll need a digital input pin with interrupt support. On the Arduino Uno, this restricts us to pin 2 or 3. We use pin 2, plus the necessary resistor. | ||
==Control | ==Control== | ||
===Fan PWM=== | |||
We set up a 25K PWM signal on pin 8. We can't use the standard Arduino PWM system, which operates at lower frequencies (490Hz and 980Hz). We operate directly on timer registers, using timer 4: | We set up a 25K PWM signal on pin 8. We can't use the standard Arduino PWM system, which operates at lower frequencies (490Hz and 980Hz). We operate directly on timer registers, using timer 4: | ||
<pre> | <pre> | ||
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OCR4C = duty; | OCR4C = duty; | ||
</pre> | </pre> | ||
===LEDs=== | |||
We use three PWM-capable digital pins: 9, 10, and 11 for blue, green, and red respectively. <tt>analogWrite()</tt> is sufficient to set the brightness. These pins are used to control logic level MOSFETs, which are also hooked up to ground and the 12V input. | |||
==Temps== | ==Temps== | ||
