SparkFun will be closed Nov 26th and 27th for the Thanksgiving holiday. Orders placed after 2:00pm MT on the 25th will ship out Monday the 30th.


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 :(