user137267

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• Internal pull-down enough for FET?

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• Internal pull-down enough for FET?

  in Puck.js, Pixl.js and MDBT42 • 3 years

  

  Thanks for quick answer! Yes I power the sensor from 3.3v. Thanks for pointing that out.

• Internal pull-down enough for FET?

  in Puck.js, Pixl.js and MDBT42 • 3 years

  

  Hi!
  I am using a BS170 FET transistor[1] to turn on/off a magnetic rotation sensor RM08 [2] that draws ~30mA. The transistor is placed between sensor ground and GND and the gate pin is connected to D15. The whole thing is powered with a 3.7v lithium battery.

  Initially I used a 100kohm resistor between my control pin and GND, but it seems like it works as well without (using the internal I presume). I just do digital write 0 or 1 on the control pin. My question is if this is a legit way to do it or if I should expect any problems? Not using the external resistor makes the assembly much easier in my application.

  [1] https://www.electrokit.com/uploads/productfile/40320/40320170.pdf
  [2] https://www.rls.si/eng/rm08-super-small-non-contact-rotary-encoder