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SparkFun will be closed May 25, 2015 for Memorial Day. Orders placed after 2pm on Friday the 22nd will ship out on Tuesday. Thanks!

Coops213

Member Since: November 24, 2010

Country: United States

  • Someone else might want to check this, but here’s how I understand it. The drain (D) of the FET is connected to 5v, and the source (S) is connected to the heater input of the sensor. The PWM pin is then connected to the gate (G) of the FET. By setting the PWM widths as shown below, the voltage at S on the FET with switch between 1.4v and 5v. You essentially use the FET as a switch, the advantage being you don’t pull large amounts of current out of the microcontroller, potentially damaging it.

  • Is it just me or have all the pictures disappeared?

No public wish lists :(