I want to use a force sensing resistor (FSR) to turn on a 300-350mA (steady state) 4 volt DC motor when pressure is applied to the FSR.
As the image shows, my plan is to have a voltage divider between the FSR and some other resistor such that, once you press the FSR the voltage on the (-) input terminal increases and it turns the output of comparator high which in turn turns the MOSFET on driving the DC motor.
I have found these NCS225x comparators that will work at low voltages (3-5V) and output enough current (about 40mA.) Do you think this setup will work properly? What MOSFETs would you recommend using for a low side driver of a 3-4V motor?
The difference between NCS2250 and NCS2252 is that the NCS2250 has a "complementary push pull output" while the NCS2252 has an open drain output. What does that mean in terms of my application?