hello everyone, newbie here. i just start playing pwm function for my dc motor and i run into something that i cant understand.
here’s the thing i use:
- arduino uno rev3
- l298n driver module
- 12v - 5v step down with usb output
- dc brushed motor
- 11v battery
so basically i split my 11v battery power to:
- 12v input L298n driver
- 12v - 5v stepdown that i use to power the arduino
the rest is pretty much where it should be. for testing i only use one dc motor. the dc motor is freespinning without any load.
i use a simple code where it giving increasingly pwm 80,150,250, with 3000 delay in between.
but here’s what i didnt understand
when i use the stepdown to power my arduino, theres no noticeable speed different at given pwm number. in fact, it look like the motor are spinning full speed everytime.
is it because i didnt give load to the motor so it look like it spinning on full speed?
but when i use my laptop to power the arduino, theres noticeable speed different. but it seems very weak. even when pwm number is 80, the motor are hardly spinning.