Motor control 8*16mm 3.7v coreless motors

[Ramila]

Hi,
I'm making a small drone with 8*16mm coreless 3.7v motors. It controls by a node mcu (A development bored with wifi). When controling the speed of motors nodemcu's output signal ranges from 0v to 3.3v then the supply to a motor should be range from 0v to 3.7v at 2A (may be less but I want to be secure) current (for a one motor).
I used one d313 transistor (only transistor) with my 3.7v battery then at highest speed it gives output of 2.5v or less.
Can anyone help?

 

[KlausST]

Hi,

Did you read the datasheet?
It says 1V VCE with 2A ... but this is with 0.2A of base current, which I assume you dont have.
Less base current, higher dropout voltage.

For less dropout voltage you should consider to use a MOSFET.

choose one with
* Low V_GS_Th, much less than 3.3V, they are often called "logic level" Mosfet
* low R_DS_ON. It should be less than expected_dropout_voltage / expected current.

Almost any MOSFET manufacturer and any distributor provides interactive selection guides for choosing a suitable MOSFET.

Klaus